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Inspection Procedure 6: Keyless entry hazard light answerback function, the dome light answerback function or the horn answerback function does not work normally.
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
 
 
TECHNICAL DESCRIPTION (COMMENT)
If the hazard warning light and the dome light works normally, ETACS-ECU may be faulty. Also, the answerback function may have been disabled using the customization function.
 
 
TROUBLESHOOTING HINTS
  • The turn signal lights may be defective
  • The dome light may be defective
  • The horn may be defective
  • The ETACS-ECU may be defective
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
 
 
 
DIAGNOSIS
STEP 1. Verify the operation hazard warning light.
Check that the hazard warning light illuminate normally.
Is the check result normal?
Go to Step 2.
Refer to GROUP 54A - inspection procedure 1: "Hazard warning light does not illuminate ."
 
STEP 2. Verify the operation of the dome light.
Check that the dome lights illuminate normally.
Is the check result normal?
Go to Step 3.
Refer to GROUP 54A - inspection procedure 1 "The front dome light does not illuminate normally ." or inspection procedure 2 "The rear dome light does not illuminate normally ."
 
STEP 3. Verify the horn.
Check that the horn normally.
Is the check result normal?
Go to Step 4.
Replace the horn (Refer to GROUP 54A, Horn ).
 
STEP 4. Check the operation of the keyless entry system.
Operate the transmitter and check that all doors lock and unlock.
Is the check result normal?
Go to Step 5.
Refer to inspection procedure 5: "Keyless entry system does not work ."
 
STEP 5. Check the customize function (Hazard light answerback).
Check that any one of the followings other than "Lock: 0, Unlock: 0" is set for "Hazard answerback" with a customization function.
  • Lock:1, Unlock:2
  • Lock:1, Unlock:0
  • Lock:0, Unlock:2
  • Lock:2, Unlock:1
  • Lock:2, Unlock:0
  • Lock:0, Unlock:1
Is the check result normal?
Go to Step 6.
Set "Hazard answerback" to any one other than "Lock: 0, Unlock: 0" with a customization function (Refer to ).
 
STEP 6. Check the customize function (Horn answerback).
Check that any one of the followings other than "Not sound horn" is set for "Horn chirp by keyless" with a customization function.
  • Lock any time
  • W lock any time
Is the check result normal?
Go to Step 7.
Set "Horn chirp by keyless" to any one other than "Not sound horn" with a customization function (Refer to ).
 
STEP 7. Check of the troubles
Check if the keyless entry answerback function works normally.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
Replace ETACS-ECU.