Inspection Procedure 6

Inspection Procedure 6: The Dome Light, The Turn-signal Lights And The Horn Do Not Operate Through The Answerback 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 answerback function may have been disabled using the customization function. If the theft alarm is defective, the keyless entry hazard answerback 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 : Refer to Inspection Procedure 1: The Hazard Warning lights do not Illuminate. 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 : Refer to Trouble Symptom Chart. Trouble 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.

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 trouble symptom chart. 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 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

Q: Is the check result normal?

YES : Go to Step 6.

NO : Set "Hazard answerback" to any one other than "Lock: 0, Unlock: 0" with a customization function. Programming and Relearning

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. Programming and Relearning

STEP 7. Using scan tool MB991958, read the diagnostic trouble code.

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.







1. Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III)." How To Connect The Scan Tool (M.U.T.-III)
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. Diagnostic Trouble Code Descriptions

NO : Go to Step 8.

STEP 8. Check of the troubles.

Check if the keyless entry answerback function works normally.

Q: Is the check result normal?

YES : Intermittent malfunction.

NO : Replace ETACS-ECU.