The ETACS-ECU will set diagnosis code No. U1515 when no communication has been carried
out for more than a certain period after the slave task received last valid data.
PROBABLE CAUSES
Malfunction of the ETACS-ECU
Malfunction of the slave ECU
LIN bus lines shorted to power supply
LIN bus lines shorted to ground
DIAGNOSIS PROCEDURE
STEP 1. Check the following connectors.
Check the following connectors:
C-301 and C-316 ETACS-ECU connectors
C-212 Column switch connector
E-18 Power window main switch connector
E-05 Front power window sub switch connector
E-24 Rear power window sub switch (LH) connector
E-10 Rear power window sub switch (RH) connector
D-04 Sunroof motor assembly connector
Q.
Are all the connectors in good condition?
Go to Step 2.
Repair the defective connector.
STEP 2. Check the following wiring harness.
Check the wiring harness between the following connectors:
Wiring harness from C-301 ETACS-ECU connector terminal No.1 to C-212 column
switch connector terminal No.3.
Wiring harness from C-301 ETACS-ECU connector terminal No.1 to E-18 power window
main switch connector terminal No.4.
Wiring harness from C-301 ETACS-ECU connector terminal No.1 to E-05 front power
window sub switch connector terminal No.6.
Wiring harness from C-301 ETACS-ECU connector terminal No.1 to E-24 rear power window
sub switch (LH) connector terminal No.6.
Wiring harness from C-301 ETACS-ECU connector terminal No.1 to E-10 rear power window
sub switch (RH) connector terminal No.6.
Wiring harness from C-316 ETACS-ECU connector terminal No.1 to D-04 sunroof motor
assembly connector terminal No.7.
note
Prior to the wiring harness inspection, check C-35, C-114, C-129, D-23 and D-36 intermediate
connectors, and repair if necessary.
Q.
Are all the wiring harness wires in good condition?
Go to Step 3.
Repair the wiring harness.
STEP 3. Measure the voltage at the LIN bus lines.
Check the LIN bus lines for short to power supply.
(1)Disconnect all the connectors which are connecter to the LIN bus lines.
(2)Turn the ignition switch from "LOCK" (OFF) to "ON" position .
(3)Measure the voltage between C-212 column switch connector terminal No.3 and ground.
The voltmeter needle does not swing.
note
If the LIN bus lines are short to power supply, the voltmeter indicates a constant value.
(4)Measure the voltage between D-04 sunroof motor assembly connector terminal No.7
and ground.
The voltmeter needle does not swing.
note
If the LIN bus lines are short to power supply, the voltmeter indicates a constant value.
Q.
Is the check result normal?
Go to Step 4.
Repair the wiring harness.
STEP 4. Measure the resistance at the LIN bus lines.
Check the LIN bus lines for short to ground.
(1)Disconnect all the connectors which are connecter to the LIN bus lines.
(2)Measure the resistance value between C-212 column switch connector terminal No.3
and ground.
No continuity (1 kΩ or more)
(3)Measure the resistance value between D-04 sunroof motor assembly connector terminal
No.7 and ground.
No continuity (1 kΩ or more)
Q.
Is the check result normal?
Go to Step 5.
Repair the wiring harness.
STEP 5. Check the column switch.
Disconnect C-212 column switch connector, and recheck whether diagnosis code No. U1515
is set.
(1)Connect all the relevant ECUs, and disconnect C-212 column switch connector only.
(2)Erase the diagnosis code.
(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position.
(4)Check whether diagnosis code No. U1515 is set.
note
If diagnosis code No. U1515 is not set, diagnosis code No. U1109 is set because the column
switch is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.
Q.
Is diagnosis code No. U1515 set?
Reconnect the column switch connector, and go to Step 6.
Replace the column switch.
STEP 6. Check the power window main switch.
Disconnect E-18 power window main switch connector, and recheck whether diagnosis code
No. U1515 is set.
(1)Connect all the relevant ECUs, and disconnect E-18 power window main switch connector
only.
(2)Erase the diagnosis code.
(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position .
(4)Check whether diagnosis code No. U1515 is set.
note
If diagnosis code No. U1515 is not set, diagnosis code No. U0215 is set because the power
window main switch is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.
Q.
Is diagnosis code No. U1515 set?
Reconnect the power window main switch connector, and go to Step 7.
Replace the power window main switch.
STEP 7. Check the front power window sub switch.
Disconnect E-05 front power window sub switch connector, and recheck whether diagnosis
code No. U1515 is set.
(1)Connect all the relevant ECUs, and disconnect E-05 front power window sub switch
connector only.
(2)Erase the diagnosis code.
(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position .
(4)Check whether diagnosis code No. U1515 is set.
note
If diagnosis code No. U1515 is not set, diagnosis code No. U0216 is set because the front
power window sub switch is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.
Q.
Is diagnosis code No. U1515 set?
Reconnect the front power window sub switch connector, and go to Step 8.
Replace the front power window sub switch.
STEP 8. Check the rear power window sub switch (LH).
Disconnect E-24 rear power window sub switch (LH) connector, and recheck whether diagnosis
code No. U1515 is set.
(1)Connect all the relevant ECUs, and disconnect E-24 rear power window sub switch
(LH) connector only.
(2)Erase the diagnosis code.
(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position .
(4)Check whether diagnosis code No. U1515 is set.
note
If diagnosis code No. U1515 is not set, diagnosis code No. U0217 is set because the rear
power window sub switch (LH) is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.
Q.
Is diagnosis code No. U1515 set?
Reconnect the rear power window sub switch (LH) connector, and go to Step 9.
Replace the rear power window sub switch (LH).
STEP 9. Check the rear power window sub switch (RH).
Disconnect E-10 rear power window sub switch (RH) connector, and recheck whether diagnosis
code No. U1515 is set.
(1)Connect all the relevant ECUs, and disconnect E-10 rear power window sub switch
(RH) connector only.
(2)Erase the diagnosis code.
(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position .
(4)Check whether diagnosis code No. U1515 is set.
note
If diagnosis code No. U1515 is not set, diagnosis code No. U0218 is set because the rear
power window sub switch (RH) is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.
Q.
Is diagnosis code No. U1515 set?
Reconnect the rear power window sub switch (RH) connector, and go to Step 10.
Replace the rear power window sub switch (RH).
STEP 10. Check the sunroof motor assembly.
Disconnect D-04 sunroof motor assembly connector, and recheck whether diagnosis code No.
U1515 is set.
(1)Connect all the relevant ECUs, and disconnect D-04 sunroof motor assembly connector
only.
(2)Erase the diagnosis code.
(3)Turn the ignition switch from "LOCK" (OFF) to "ON" position .
(4)Check whether diagnosis code No. U1515 is set.
note
If diagnosis code No. U1515 is not set, diagnosis code No. U0169 is set because the sunroof
motor assembly is disconnected. This is normal.
(5)Turn the ignition switch to the "LOCK" (OFF) position.
Q.
Is diagnosis code No. U1515 set?
Reconnect the sunroof motor assembly connector, and go to Step 11.
Replace the sunroof motor assembly.
STEP 11. Recheck for diagnosis code.
Check again if the diagnosis code is set to the ETACS-ECU.
(1)Erase the diagnosis code.
(2)Turn the ignition switch from "LOCK" (OFF) to "ON" position .
(3)Check whether diagnosis code No. U1515 is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q.
Is the diagnosis code set?
Replace the ETACS-ECU.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Cope with Intermittent Malfunction ).
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Go to Step 2.
Repair the defective connector.
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