Diagnosis Item 22: Short to power supply or earth, open circuit or line-to-line short in the CAN-B bus lines

caution

When servicing a CAN bus line, earth yourself by touching a metal object such as an unpainted water pipe. If you fail to do, a component connected to the CAN bus line may be broken.

FUNCTION

If a short to power supply or earth, open circuit or line-to-line short is present at either CAN_H or CAN_L side on the CAN-B lines, this diagnosis result will be set.

TRUBLE JUDGEMENT CONDITIONS

When CAN-B lines communication is normal, and diagnosis code U0019 is set, the ETACS-ECU determines that there is a failure.

TROUBLESHOOTING HINTS

Malfunction of the connector (short to power supply or earth in connector or improperly connected)
Malfunction of the wiring harness (short to power supply or earth, open circuit or line-to-line short in CAN bus lines)
Faulty ECU(s) (internal short to power supply or earth)

DIAGNOSIS PROCEDURE

STEP 1. Checking short to earth (resistance measurement)

note

This check determines whether there is a short to earth in the CAN-B bus line. If a short to earth is present in either the CAN_H or CAN_L line, check the appropriate line only.

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect C-301 ETACS-ECU connector, and measure at the wiring harness side.

(2)Measure the resistance between C-301 ETACS-ECU connector terminal No.6 and body earth. <CAN_H>
OK: 1 kΩ or more

(3)Measure the resistance between C-301 ETACS-ECU connector terminal No.7 and body earth. <CAN_L>
OK: 1 kΩ or more

Q. Is the check result normal?

	Go to Step 11.

	Go to Step 2.

STEP 2. Check the wiring harness between C-32 SRS connector and C-105 joint connector (CAN1) for short to earth (resistance measurement).

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Measure the resistance between C-105 joint connector (CAN1) terminal No.1 <LHD> or 7 <RHD> and body earth. <CAN_H>
OK: 1 kΩ or more

(3)Measure the resistance between C-105 joint connector (CAN1) terminal No.12 <LHD> or 20 <RHD> and body earth. <CAN_L>
OK: 1 kΩ or more

Q. Is the check result normal?

	Go to Step 3.

	Go to Step 40.

STEP 3. Check the wiring harness between C-111 A/C-ECU connector and C-105 joint connector (CAN1) for short to earth (resistance measurement).

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Measure the resistance between C-105 joint connector (CAN1) terminal No.9 and body earth. <CAN_H>
OK: 1 kΩ or more

(3)Measure the resistance between C-105 joint connector (CAN1) terminal No.22 and body earth. <CAN_L>
OK: 1 kΩ or more

Q. Is the check result normal?

	Go to Step 4.

	Go to Step 41.

STEP 4. Check the wiring harness between C-03 combination meter connector and C-105 joint connector (CAN1) for short to earth (resistance measurement).

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Measure the resistance between C-105 joint connector (CAN1) terminal No.3 and body earth. <CAN_H>
OK: 1 kΩ or more

(3)Measure the resistance between C-105 joint connector (CAN1) terminal No.14 and body earth. <CAN_L>
OK: 1 kΩ or more

Q. Is the check result normal?

	YES <vehicles with WCM> : Go to Step 5.

	YES <vehicles with KOS> : Go to Step 6.

	NO (the check result is not normal.) : Go to Step 42.

STEP 5. Check the wiring harness between C-33 WCM connector and C-105 joint connector (CAN1) for short to earth (resistance measurement).

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Measure the resistance between C-105 joint connector (CAN1) terminal No.5 and body earth. <CAN_H>
OK: 1 kΩ or more

(3)Measure the resistance between C-105 joint connector (CAN1) terminal No.16 and body earth. <CAN_L>
OK: 1 kΩ or more

Q. Is the check result normal?

	YES <vehicles without audio unit and MMCS> : Go to Step 10.

	YES <vehicles with audio unit> : Go to Step 7.

	YES <vehicles with MMCS> : Go to Step 8.

	NO (the check result is not normal.) : Go to Step 43.

STEP 6. Check the wiring harness between C-104 KOS-ECU connector and C-105 joint connector (CAN1) for short to earth (resistance measurement).

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Measure the resistance between C-105 joint connector (CAN1) terminal No.8 and body earth. <CAN_H>
OK: 1 kΩ or more

(3)Measure the resistance between C-105 joint connector (CAN1) terminal No.21 and body earth. <CAN_L>
OK: 1 kΩ or more

Q. Is the check result normal?

	YES <vehicles without audio unit and MMCS> : Go to Step 10.

	YES <vehicles with audio unit> : Go to Step 7.

	YES <vehicles with MMCS> : Go to Step 8.

	NO (the check result is not normal.) : Go to Step 44.

STEP 7. Check the wiring harness between C-18 audio unit connector and C-105 joint connector (CAN1) for short to earth (resistance measurement).

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Measure the resistance between C-105 joint connector (CAN1) terminal No.10 <LHD> or 2 <RHD> and body earth. <CAN_H>
OK: 1 kΩ or more

(3)Measure the resistance between C-105 joint connector (CAN1) terminal No.23 <LHD> or 13 <RHD> and body earth. <CAN_L>
OK: 1 kΩ or more

Q. Is the check result normal?

	YES <vehicles without hands-free system> : Go to Step 10.

	YES <vehicles with hands-free system> : Go to Step 9.

	NO (the check result is not normal.) : Go to Step 45.

STEP 8. Check the wiring harness between C-15 CAN box unit connector and C-105 joint connector (CAN1) for short to earth (resistance measurement).

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Measure the resistance between C-105 joint connector (CAN1) terminal No.10 <LHD> or 2 <RHD> and body earth. <CAN_H>
OK: 1 kΩ or more

(3)Measure the resistance between C-105 joint connector (CAN1) terminal No.23 <LHD> or 13 <RHD> and body earth. <CAN_L>
OK: 1 kΩ or more

Q. Is the check result normal?

	YES <vehicles without hands-free system> : Go to Step 10.

	YES <vehicles with hands-free system> : Go to Step 9.

	NO (the check result is not normal.) : Go to Step 46.

STEP 9. Check the wiring harness between C-122 hands free-ECU connector and C-105 joint connector (CAN1) for short to earth (resistance measurement).

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Measure the resistance between C-105 joint connector (CAN1) terminal No.7 <LHD> or 11 <RHD> and body earth. <CAN_H>
OK: 1 kΩ or more

(3)Measure the resistance between C-105 joint connector (CAN1) terminal No.20 <LHD> or 24 <RHD> and body earth. <CAN_L>
OK: 1 kΩ or more

Q. Is the check result normal?

	Go to Step 10.

	Go to Step 47.

STEP 10. Check the wiring harness between C-301 ETACS-ECU connector and C-105 joint connector (CAN1) for short to earth (resistance measurement).

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .
Strictly observe the specified wiring harness repair procedure. For details refer to .

(1)Disconnect ETACS-ECU connector and joint connector (CAN1), and measure at the wiring harness side.

(2)Measure the resistance between C-105 joint connector (CAN1) terminal No.6 and body earth. <CAN_H>
OK: 1 kΩ or more

(3)Measure the resistance between C-105 joint connector (CAN1) terminal No.19 and body earth. <CAN_L>
OK: 1 kΩ or more

Q. Is the check result normal?

	Go to Step 48.

	Repair the wiring harness between C-301 ETACS-ECU connector and C-105 joint connector (CAN1).

STEP 11. Checking short to power supply (voltage measurement)

note

This check determines whether there is a short to power supply in the CAN-B bus line. If a failure is present in either the CAN_H or CAN_L line, check the appropriate line only.

caution

A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect C-301 ETACS-ECU connector, and measure at the wiring harness side.

(2)Turn the ignition switch to the ON position.

(3)Measure the voltage between C-301 ETACS-ECU connector terminal No.6 and body earth. <CAN_H>
OK: 5 V or less

(4)Measure the voltage between C-301 ETACS-ECU connector terminal No.7 and body earth. <CAN_L>
OK: 5 V or less

Q. Is the check result normal?

	Go to Step 21.

	Go to Step 12.

STEP 12. Check the wiring harness between C-32 SRS connector and C-105 joint connector (CAN1) for short to power supply (voltage measurement).

caution

A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Turn the ignition switch to the ON position.

(3)Measure the voltage between C-105 joint connector (CAN1) terminal No.1 <LHD> or 7 <RHD> and body earth. <CAN_H>
OK: 5 V or less

(4)Measure the voltage between C-105 joint connector (CAN1) terminal No.12 <LHD> or 20 <RHD> and body earth. <CAN_L>
OK: 5 V or less

Q. Is the check result normal?

	Go to Step 13.

	Go to Step 40.

STEP 13. Check the wiring harness between C-111 A/C-ECU connector and C-105 joint connector (CAN1) for short to power supply (voltage measurement).

caution

A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Turn the ignition switch to the ON position.

(3)Measure the voltage between C-105 joint connector (CAN1) terminal No.9 and body earth. <CAN_H>
OK: 5 V or less

(4)Measure the voltage between C-105 joint connector (CAN1) terminal No.22 and body earth. <CAN_L>
OK: 5 V or less

Q. Is the check result normal?

	Go to Step 14.

	Go to Step 41.

STEP 14. Check the wiring harness between C-03 combination meter connector and C-105 joint connector (CAN1) for short to power supply (voltage measurement).

caution

A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Turn the ignition switch to the ON position.

(3)Measure the voltage between C-105 joint connector (CAN1) terminal No.3 and body earth. <CAN_H>
OK: 5 V or less

(4)Measure the voltage between C-105 joint connector (CAN1) terminal No.14 and body earth. <CAN_L>
OK: 5 V or less

Q. Is the check result normal?

	YES <vehicles with WCM> : Go to Step 15.

	YES <vehicles with KOS> : Go to Step 16.

	NO (the check result is not normal.) : Go to Step 42.

STEP 15. Check the wiring harness between C-33 WCM connector and C-105 joint connector (CAN1) for short to power supply (voltage measurement).

caution

A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Turn the ignition switch to the ON position.

(3)Measure the voltage between C-105 joint connector (CAN1) terminal No.5 and body earth. <CAN_H>
OK: 5 V or less

(4)Measure the voltage between C-105 joint connector (CAN1) terminal No.16 and body earth. <CAN_L>
OK: 5 V or less

Q. Is the check result normal?

	YES <vehicles without audio unit and MMCS> : Go to Step 20.

	YES <vehicles with audio unit> : Go to Step 17.

	YES <vehicles with MMCS> : Go to Step 18.

	NO (the check result is not normal.) : Go to Step 43.

STEP 16. Check the wiring harness between C-104 KOS-ECU connector and C-105 joint connector (CAN1) for short to power supply (voltage measurement).

caution

A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Turn the ignition switch to the ON position.

(3)Measure the voltage between C-105 joint connector (CAN1) terminal No.8 and body earth. <CAN_H>
OK: 5 V or less

(4)Measure the voltage between C-105 joint connector (CAN1) terminal No.21 and body earth. <CAN_L>
OK: 5 V or less

Q. Is the check result normal?

	YES <vehicles without audio unit and MMCS> : Go to Step 20.

	YES <vehicles with audio unit> : Go to Step 17.

	YES <vehicles with MMCS> : Go to Step 18.

	NO (the check result is not normal.) : Go to Step 44.

STEP 17. Check the wiring harness between C-18 audio unit connector and C-105 joint connector (CAN1) for short to power supply (voltage measurement).

caution

A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Turn the ignition switch to the ON position.

(3)Measure the voltage between C-105 joint connector (CAN1) terminal No.10 <LHD> or 2 <RHD> and body earth. <CAN_H>
OK: 5 V or less

(4)Measure the voltage between C-105 joint connector (CAN1) terminal No.23 <LHD> or 13 <RHD> and body earth. <CAN_L>
OK: 5 V or less

Q. Is the check result normal?

	YES <vehicles without hands-free system> : Go to Step 20.

	YES <vehicles with hands-free system> : Go to Step 19.

	NO (the check result is not normal.) : Go to Step 45.

STEP 18. Check the wiring harness between C-15 CAN box unit connector and C-105 joint connector (CAN1) for short to power supply (voltage measurement).

caution

A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Turn the ignition switch to the ON position.

(3)Measure the voltage between C-105 joint connector (CAN1) terminal No.10 <LHD> or 2 <RHD> and body earth. <CAN_H>
OK: 5 V or less

(4)Measure the voltage between C-105 joint connector (CAN1) terminal No.23 <LHD> or 13 <RHD> and body earth. <CAN_L>
OK: 5 V or less

Q. Is the check result normal?

	YES <vehicles without hands-free system> : Go to Step 20.

	YES <vehicles with hands-free system> : Go to Step 19.

	NO (the check result is not normal.) : Go to Step 46.

STEP 19. Check the wiring harness between C-122 hands free-ECU connector and C-105 joint connector (CAN1) for short to power supply (voltage measurement).

caution

A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side.

(2)Turn the ignition switch to the ON position.

(3)Measure the voltage between C-105 joint connector (CAN1) terminal No.7 <LHD> or 11 <RHD> and body earth. <CAN_H>
OK: 5 V or less

(4)Measure the voltage between C-105 joint connector (CAN1) terminal No.20 <LHD> or 24 <RHD> and body earth. <CAN_L>
OK: 5 V or less

Q. Is the check result normal?

	Go to Step 20.

	Go to Step 47.

STEP 20. Check the wiring harness between C-301 ETACS-ECU connector and C-105 joint connector (CAN1) for short to power supply (voltage measurement).

caution

A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .
Strictly observe the specified wiring harness repair procedure. For details refer to .

(1)Disconnect the joint connector (CAN1), and measure at the wiring harness side.

(2)Turn the ignition switch to the ON position.

(3)Measure the voltage between C-105 joint connector (CAN1) terminal No.6 and body earth. <CAN_H>
OK: 5 V or less

(4)Measure the voltage between C-105 joint connector (CAN1) terminal No.19 and body earth. <CAN_L>
OK: 5 V or less

Q. Is the check result normal?

	Go to Step 48.

	Repair the wiring harness between C-301 ETACS-ECU connector and C-105 joint connector (CAN1).

STEP 21. Checking line-to-line short

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect C-301 ETACS-ECU connector, and check that there is continuity at the harness side.

(2)Check that there is continuity between C-301 ETACS-ECU connector terminal Nos.6 and 7.
OK: No continuity

Q. Is the check result normal?

	Go to Step 31.

	Go to Step 22.

STEP 22. Check the wiring harness between C-32 SRS connector and C-105 joint connector (CAN1) for line-to-line short.

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and check that there is continuity at the harness side.

(2)Check that there is continuity between C-105 joint connector terminal Nos.1 and 12 <LHD> or 7 and 20 <RHD>.
OK: No continuity

Q. Is the check result normal?

	Go to Step 23.

	Go to Step 40.

STEP 23. Check the wiring harness between C-111 A/C-ECU connector and C-105 joint connector (CAN1) for line-to-line short.

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and check that there is continuity at the harness side.

(2)Check that there is continuity between C-105 joint connector terminal Nos.9 and 22.
OK: No continuity

Q. Is the check result normal?

	Go to Step 24.

	Go to Step 41.

STEP 24. Check the wiring harness between C-03 combination meter connector and C-105 joint connector (CAN1) for line-to-line short.

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and check that there is continuity at the harness side.

(2)Check that there is continuity between C-105 joint connector terminal Nos.3 and 14.
OK: No continuity

Q. Is the check result normal?

	YES <vehicles with WCM> : Go to Step 25.

	YES <vehicles with KOS> : Go to Step 26.

	NO (the check result is not normal.) : Go to Step 42.

STEP 25. Check the wiring harness between C-33 WCM connector and C-105 joint connector (CAN1) for line-to-line short.

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and check that there is continuity at the harness side.

(2)Check that there is continuity between C-105 joint connector terminal Nos.5 and 16.
OK: No continuity

Q. Is the check result normal?

	YES <vehicles without audio unit or MMCS> : Go to Step 30.

	YES <vehicles with audio unit> : Go to Step 27.

	YES <vehicles with MMCS> : Go to Step 28.

	NO (the check result is not normal.) : Go to Step 43.

STEP 26. Check the wiring harness between C-104 KOS-ECU connector and C-105 joint connector (CAN1) for line-to-line short.

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and check that there is continuity at the harness side.

(2)Check that there is continuity between C-105 joint connector terminal Nos.8 and 21.
OK: No continuity

Q. Is the check result normal?

	YES <vehicles without audio unit or MMCS> : Go to Step 30.

	YES <vehicles with audio unit> : Go to Step 27.

	YES <vehicles with MMCS> : Go to Step 28.

	NO (the check result is not normal.) : Go to Step 44.

STEP 27. Check the wiring harness between C-18 audio unit connector and C-105 joint connector (CAN1) for line-to-line short.

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and check that there is continuity at the harness side.

(2)Check that there is continuity between C-105 joint connector terminal Nos.10 and 23 <LHD> or 2 and 13 <RHD>.
OK: No continuity

Q. Is the check result normal?

	YES <vehicles without hands-free system> : Go to Step 29.

	YES <vehicles without hands-free system> : Go to Step 30.

	NO (the check result is not normal.) : Go to Step 45.

STEP 28. Check the wiring harness between C-15 CAN box unit connector and C-105 joint connector (CAN1) for line-to-line short.

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and check that there is continuity at the harness side.

(2)Check that there is continuity between C-105 joint connector terminal Nos.10 and 23 <LHD> or 2 and 13 <RHD>.
OK: No continuity

Q. Is the check result normal?

	YES <vehicles without hands-free system> : Go to Step 29.

	YES <vehicles without hands-free system> : Go to Step 30.

	NO (the check result is not normal.) : Go to Step 46.

STEP 29. Check the wiring harness between C-122 hands free-ECU connector and C-105 joint connector (CAN1) for line-to-line short.

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and check that there is continuity at the harness side.

(2)Check that there is continuity between C-105 joint connector terminal Nos.7 and 20 <LHD> or 11 and 24 <RHD>.
OK: No continuity

Q. Is the check result normal?

	Go to Step 30.

	Go to Step 47.

STEP 30. Check the wiring harness between C-301 ETACS-ECU connector and C-105 joint connector (CAN1) for line-to-line short.

caution

Disconnect the negative battery terminal. For details refer to .
A digital multimeter should be used. For details refer to .
The test wiring harness should be used. For details refer to .
Strictly observe the specified wiring harness repair procedure. For details refer to .

(1)Disconnect joint connector (CAN1), and check that there is continuity at the harness side.

(2)Check that there is continuity between C-105 joint connector terminal Nos.6 and 19.
OK: No continuity

Q. Is the check result normal?

	Repair the wiring harness between C-301 ETACS-ECU connector and C-105 joint connector (CAN1).

	Go to Step 48.

STEP 31. Check the wiring harness between C-32 SRS-ECU connector and C-105 joint connector (CAN1)

Disconnect SRS-ECU connector and joint connector (CAN1), and check the following wiring harness.

The wiring harness between C-32 SRS-ECU connector terminal No.1 <LHD> or 7 <RHD> and C-105 joint connector (CAN1) terminal No.10
The wiring harness between C-32 SRS-ECU connector terminal No.12 <LHD> or 20 <RHD> and C-105 joint connector (CAN1) terminal No.9

Q. Is the check result normal?

	Go to Step 32.

	Go to Step 40.

STEP 32. Check the wiring harness between C-111 A/C-ECU connector and C-105 joint connector (CAN1)

Disconnect A/C-ECU connector and joint connector (CAN1), and check the following wiring harness.

The wiring harness between C-111 A/C-ECU connector terminal No.9 and C-105 joint connector (CAN1) terminal No.11
The wiring harness between C-111 A/C-ECU connector terminal No.22 and C-105 joint connector (CAN1) terminal No.12

Q. Is the check result normal?

	Go to Step 33.

	Go to Step 41.

STEP 33. Check the wiring harness between C-03 combination meter connector and C-105 joint connector (CAN1)

Disconnect combination meter connector and joint connector (CAN1), and check the wiring harness.

The wiring harness between C-03 combination meter connector terminal No.3 and C-105 joint connector (CAN1) terminal No.14
The wiring harness between C-03 combination meter connector terminal No.14 and C-105 joint connector (CAN1) terminal No.15

Q. Is the check result normal?

	YES <vehicles with WCM> : Go to Step 34.

	YES <vehicles with KOS> : Go to Step 35.

	NO (the check result is not normal.) : Go to Step 42.

STEP 34. Check the wiring harness between C-33 WCM connector and C-105 joint connector (CAN1)

Disconnect WCM connector and joint connector (CAN1), and check the following wiring harness.

The wiring harness between C-33 WCM connector terminal No.5 and C-105 joint connector (CAN1) terminal No.11
The wiring harness between C-33 WCM connector terminal No.16 and C-105 joint connector (CAN1) terminal No.10

Q. Is the check result normal?

	YES <vehicles without audio unit and MMCS> : Go to Step 39.

	YES <vehicles with audio unit> : Go to Step 36.

	YES <vehicles with MMCS> : Go to Step 37.

	NO (the check result is not normal.) : Go to Step 43.

STEP 35. Check the wiring harness between C-104 KOS-ECU connector and C-105 joint connector (CAN1)

Disconnect KOS-ECU connector and joint connector (CAN1), and check the following wiring harness.

The wiring harness between C-104 KOS-ECU connector terminal No.8 and C-105 joint connector (CAN1) terminal No.1
The wiring harness between C-104 KOS-ECU connector terminal No.21 and C-105 joint connector (CAN1) terminal No.2

Q. Is the check result normal?

	YES <vehicles without audio unit and MMCS> : Go to Step 39.

	YES <vehicles with audio unit> : Go to Step 36.

	YES <vehicles with MMCS> : Go to Step 37.

	NO (the check result is not normal.) : Go to Step 44.

STEP 36. Check the wiring harness between C-18 audio unit connector and C-105 joint connector (CAN1)

Disconnect audio unit connector and joint connector (CAN1), and check the following wiring harness.

The wiring harness between C-18 audio unit connector terminal No.23 and C-105 joint connector (CAN1) terminal No.10 <LHD> or 2 <RHD>
The wiring harness between C-18 audio unit connector terminal No.33 and C-105 joint connector (CAN1) terminal No.23 <LHD> or 13 <RHD>

Q. Is the check result normal?

	YES <vehicles without hands-free system> : Go to Step 39.

	YES <vehicles with hands-free system> : Go to Step 38.

	NO (the check result is not normal.) : Go to Step 45.

STEP 37. Check the wiring harness between C-15 CAN box unit connector and C-105 joint connector (CAN1)

Disconnect CAN box unit connector and joint connector (CAN1), and check the following wiring harness.

The wiring harness between C-15 CAN box unit connector terminal No.8 and C-105 joint connector (CAN1) terminal No.10 <LHD> or 2 <RHD>
The wiring harness between C-15 CAN box unit connector terminal No.9 and C-105 joint connector (CAN1) terminal No.23 <LHD> or 13 <RHD>

Q. Is the check result normal?

	YES <vehicles without hands-free system> : Go to Step 39.

	YES <vehicles with hands-free system> : Go to Step 38.

	NO (the check result is not normal.) : Go to Step 46.

STEP 38. Check the wiring harness between C-122 hands free-ECU connector and C-105 joint connector (CAN1)

Disconnect hands free-ECU connector and joint connector (CAN1), and check the following wiring harness.

The wiring harness between C-122 hands free-ECU connector terminal No.4 and C-105 joint connector (CAN1) terminal No.7 <LHD> or 11 <RHD>
The wiring harness between C-122 hands free-ECU connector terminal No.16 and C-105 joint connector (CAN1) terminal No.20 <LHD> or 24 <RHD>

Q. Is the check result normal?

	Go to Step 39.

	Go to Step 47.

STEP 39 Check the wiring harness between C-301 ETACS-ECU connector and C-105 joint connector (CAN1)

caution

Strictly observe the specified wiring harness repair procedure. For details refer to

Disconnect ETACS-ECU connector and joint connector (CAN1), and check the following wiring harness.

The wiring harness between C-301 ETACS-ECU connector terminal No.6 and C-105 joint connector (CAN1) terminal No.6
The wiring harness between C-301 ETACS-ECU connector terminal No.7 and C-105 joint connector (CAN1) terminal No.19

Q. Is the check result normal?

	Go to Step 48.

	Repair the wiring harness between C-301 ETACS-ECU connector and C-105 joint connector (CAN1).

STEP 40. M.U.T.-III CAN bus diagnostics (checking the SRS-ECU for internal short)

caution

Strictly observe the specified wiring harness repair procedure. For details refer to

Disconnect C-32 SRS-ECU connector, and diagnose the CAN bus line.

OK: The display of the M.U.T.-III is as shown in the figure.

Q. Does M.U.T.-III screen correspond to the illustration?

Repair the wiring harness between C-32 SRS-ECU connector and C-105 joint connector (CAN1).

Check the SRS-ECU connector, and repair if necessary. If the SRS-ECU connector is in good condition, replace the SRS-ECU.

STEP 41. M.U.T.-III CAN bus diagnostics (checking the A/C-ECU for internal short)

caution

Strictly observe the specified wiring harness repair procedure. For details refer to

Disconnect C-111 A/C-ECU connector, and diagnose the CAN bus line.

OK: The display of the M.U.T.-III is as shown in the figure.

Q. Does M.U.T.-III screen correspond to the illustration?

Repair the wiring harness between C-111 A/C-ECU connector and C-105 joint connector (CAN1).

Check the A/C-ECU connector, and repair if necessary. If the A/C-ECU connector is in good condition, replace the A/C-ECU.

STEP 42. M.U.T.-III CAN bus diagnostics (checking the combination meter for internal short)

caution

Strictly observe the specified wiring harness repair procedure. For details refer to

Disconnect C-03 combination meter connector, and diagnose the CAN bus line.

OK: The display of the M.U.T.-III is as shown in the figure.

Q. Does M.U.T.-III screen correspond to the illustration?

Repair the wiring harness between C-03 combination meter connector and C-105 joint connector (CAN1).

Check the combination meter connector, and repair if necessary. If the combination meter connector is in good condition, replace the combination meter.

STEP 43. M.U.T.-III CAN bus diagnostics (checking the WCM for internal short)

caution

Strictly observe the specified wiring harness repair procedure. For details refer to

Disconnect C-33 WCM connector, and diagnose the CAN bus line.

OK: The display of the M.U.T.-III is as shown in the figure.

Q. Does M.U.T.-III screen correspond to the illustration?

Repair the wiring harness between C-33 WCM connector and C-105 joint connector (CAN1).

Check the WCM connector, and repair if necessary. If the WCM connector is in good condition, replace the WCM.

STEP 44. M.U.T.-III CAN bus diagnostics (checking the KOS-ECU for internal short)

caution

Strictly observe the specified wiring harness repair procedure. For details refer to

Disconnect C-104 KOS-ECU connector, and diagnose the CAN bus line.

OK: The display of the M.U.T.-III is as shown in the figure.

Q. Does M.U.T.-III screen correspond to the illustration?

Repair the wiring harness between C-104 KOS-ECU connector and C-105 joint connector (CAN1).

Check the KOS-ECU connector, and repair if necessary. If the KOS-ECU connector is in good condition, replace the KOS-ECU.

STEP 45. M.U.T.-III CAN bus diagnostics (checking the audio unit for internal short)

caution

Strictly observe the specified wiring harness repair procedure. For details refer to

Disconnect C-18 audio unit connector, and diagnose the CAN bus line.

OK: The display of the M.U.T.-III is as shown in the figure.

Q. Does M.U.T.-III screen correspond to the illustration?

Repair the wiring harness between C-18 audio unit connector and C-105 joint connector (CAN1).

Check the audio unit connector, and repair if necessary. If the audio unit connector is in good condition, replace the audio unit.

STEP 46. M.U.T.-III CAN bus diagnostics (checking the CAN box unit for internal short)

caution

Strictly observe the specified wiring harness repair procedure. For details refer to

Disconnect C-15 CAN box unit connector, and diagnose the CAN bus line.

OK: The display of the M.U.T.-III is as shown in the figure.

Q. Does M.U.T.-III screen correspond to the illustration?

Repair the wiring harness between C-15 CAN box unit connector and C-105 joint connector (CAN1).

Check the CAN box unit connector, and repair if necessary. If the CAN box unit connector is in good condition, replace the CAN box unit.

STEP 47. M.U.T.-III CAN bus diagnostics (checking the hands free-ECU for internal short)

caution

Strictly observe the specified wiring harness repair procedure. For details refer to

Disconnect C-122 hands free-ECU connector, and diagnose the CAN bus line.

OK: The display of the M.U.T.-III is as shown in the figure.

Q. Does M.U.T.-III screen correspond to the illustration?

Repair the wiring harness between C-122 hands free-ECU connector and C-105 joint connector (CAN1).

Check the hands free-ECU connector, and repair if necessary. If the hands free-ECU connector is in good condition, replace the hands free-ECU.

STEP 48. Trouble symptom check

Diagnose the CAN bus line, and check that normal condition is displayed.

Q. Is the check result normal?

	The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

	Check the ETACS-ECU connector, and repair if necessary. If the ETACS-ECU connector is in good condition, replace the ETACS-ECU.