Inspection Procedure 1: The security alarm is not armed (The security indicator does not illuminate).


caution
  • Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in Immobilizer System - How to Register Key ID .)

COMMENTS ON TROUBLE SYMPTOM


If this function does not work normally, the input signal circuits to the components below, the security indicator, the ETACS-ECU or the CAN bus line may have a problem.

PROBABLE CAUSES



DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q. Is the check result normal?
Go to Step 2.
Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting ).

STEP 2. M.U.T.-III other system diagnosis code
Check if diagnosis code is set to the ETACS-ECU <vehicles without KOS> or KOS-ECU <vehicles with KOS>.

Q. Is the diagnosis code set?
YES <vehicles without KOS> : Troubleshoot the ETACS-ECU (Refer to ).
YES <vehicles with KOS> : Troubleshoot the KOS (Refer to GROUP 42B - KOS ).
NO : Go to Step 3.

STEP 3. Check the keyless entry transmitter.
Check that the keyless entry system works normally.

Q. Is the check result normal?
Go to Step 4.
NO <vehicles with KOS> : Troubleshoot the KOS (Refer to GROUP 42B - KOS ).
NO <vehicles without KOS> : Troubleshoot the keyless entry (Refer to GROUP 42A - keyless entry ).

STEP 4. M.U.T.-III data list
Use the ETACS-ECU service data to check the signals related to the security alarm.

  • Turn the ignition switch to the ACC position.
  • Turn the ignition switch to the OFF position (with ignition key <vehicles without KOS> or emergency key <vehicles with KOS> inserted).
  • Open each door.
  • Open the tailgate.
  • Open the hood.
Item No.
 Item name
 Normal condition
Item 256
 Dr door ajar switch
 Open
Item 257
 As door ajar switch
 Open
Item 258
 RR door ajar switch
 Open
Item 259
 RL door ajar switch
 Open
Item 260
 Gate ajar switch
 Open
Item 264
 Handle lock switch
 Key in
Item 266
 Hood switch
 ON
Item 288
 ACC switch
 ON

  • Close each door.
  • Close the tailgate.
Item No.
 Item name
 Normal condition
Item 256
 Dr door ajar switch
 Close
Item 257
 As door ajar switch
 Close
Item 258
 RR door ajar switch
 Close
Item 259
 RL door ajar switch
 Close
Item 260
 Gate ajar switch
 Close

  • Turn the ignition switch to the ’’LOCK’’ (OFF) position (keep the ignition key <vehicles without KOS> or emergency key <vehicles with KOS> removed).
Item No.
 Item name
 Normal condition
Item 264
 Handle lock switch
 Key out
Item 288
 ACC switch
 OFF
OK: Normal conditions are displayed for all the items.

Q. Is the check result normal?
YES <Normal conditions are displayed for all the items.> : Go to Step 5.
NO <Normal condition is not displayed for item No. 256.> : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 5 "The front door switch (driver’s side) signal is not received" .
NO <Normal condition is not displayed for item No. 257.> : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 6 "The front door switch (passenger’s side) signal is not received" .
NO <Normal condition is not displayed for item No. 258.> : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 7 "The rear door switch (RH) signal is not received" .
NO <Normal condition is not displayed for item No. 259.> : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 8 "The rear door switch (LH) signal is not received" .
NO <Normal condition is not displayed for item No. 260.> : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 9 "The tailgate lock actuator <vehicles without electric tailgate> or tailgate latch <vehicles with electric tailgate> signal is not received" .
NO <Normal condition is not displayed for item No. 264.> : Refer to Inspection Procedure 3 "The key reminder switch signal is not received. <Vehicles without KOS>" .
NO <Normal condition is not displayed for item No. 266.> : Refer to Inspection Procedure 15 "The hood latch switch signal is not received" .
NO <Normal condition is not displayed for item No. 288.> : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 1 "The ignition switch (ACC) signal is not received" .

STEP 5. Security indicator check
Check that the security indicator is normal. Refer to .

Q. Is the check result normal?
Go to Step 6.
Replace the centre panel unit.

STEP 6. Voltage measurement at the ETACS-ECU connector
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the voltage between the combination meter connector (power supply terminal) and the body earth.
OK: System voltage

Q. Is the check result normal?
Go to Step 8
Go to Step 7

STEP 7. Check of open circuit in power supply line between the fusible link and ETACS-ECU connector.

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 ).
Repair the connector(s) or wiring harness.

STEP 8. Check of open circuit in ROOM line between the ETACS-ECU connector and hazard indicator assembly connector.

Q. Is the check result normal?
Go to Step 9.
Repair the connector(s) or wiring harness.

STEP 9. Check of open circuit in SEC line between the ETACS-ECU connector and hazard indicator assembly connector.

Q. Is the check result normal?
Go to Step 10.
Repair the connector(s) or wiring harness.

STEP 10. Retest the system

Q. Does the security alarm work normally?
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace the ETACS-ECU.