Inspection Procedure 6
Inspection Procedure 6: The dome light, the turn-signal lights and the horn do not operate through the answer back function.
CAUTION:
Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
COMMENTS ON TROUBLE SYMPTOM
If the hazard warning light, the dome light and the horn work normally, ETACS-ECU may be faulty. Also, the answer back function may have been disabled using the customization function.
If the theft alarm is defective, the keyless entry hazard answer back function may not operate normally.
PROBABLE CAUSES
- Malfunction of the turn signal light
- Malfunction of the dome light
- Malfunction of the horn
- Malfunction of the theft alarm sensor
- Malfunction of the theft alarm siren
- Malfunction of ETACS-ECU
- Damaged wiring harness and connectors
DIAGNOSTIC PROCEDURE
STEP 1. Verify the hazard warning lights.
Check that the hazard warning lights illuminate normally.
Q. Is the check result normal?
YES Go to Step 2.
NO Inspection Procedure 1.
STEP 2. Verify the dome light.
Check that the dome light illuminate normally.
Q. Is the check result normal?
YES Go to Step 3.
NO Symptom Chart.
STEP 3. Verify the horn.
Check that the horn normally.
Q. Is the check result normal?
YES Go to Step 4.
NO Replace the horn Service and Repair).
STEP 4. Check the operation of the keyless entry system.
Operate the transmitter and check that all doors (including the liftgate) lock and unlock.
Q. Is the check result normal?
YES Go to Step 5.
NO Refer to Symptom Chart.
STEP 5. Check the customize function.
Check that any one of the followings other than "Lock: 0, Unlock: 0" is set for "Hazard answer back" 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
Q. Is the check result normal?
YES Go to Step 6.
NO Set "Hazard answer back" to any one other than "Lock: 0, Unlock: 0" with a customization function (Refer to Configuration Function).
STEP 6. Check the customize function.
Check that any one of the followings other than "Not sound horn" is set for "Horn chirp by RKE" with a customization function.
- Lock any time
- W lock any time
Q. Is the check result normal?
YES Go to Step 7.
NO Set "Horn chirp by RKE" to any one other than "Not sound horn" with a customization function (Refer to Configuration Function).
STEP 7. Using scan tool MB991958, read the diagnostic trouble code.
(1)
CAUTION:
To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."
(2)Turn the ignition switch to the "ON" position.
(3)Check whether the theft alarm related DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q. Is the DTC set?
YES Diagnose the theft alarm. Refer to Antitheft and Alarm Systems.
NO Go to Step 8.
STEP 8. Check of the troubles.
Check if the keyless entry answer back function works normally.
Q. Is the check result normal?
YES Intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Replace ETACS-ECU.