Inspection Procedure 16: Keyless entry hazard light answerback function, the dome light answerback function or the horn answerback function does not work normally.

caution

Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

TECHNICAL DESCRIPTION (COMMENT)

When the keyless entry function is used, the keyless entry hazard answerback function, dome light answerback function or horn answerback function operate as set by ETACS customisation function (If the flashing count is set to 0 with a customization function, no answerback function is performed).

TROUBLESHOOTING HINTS

Function setting error or no setting with a customization
Malfunction of the turn signal lights
Malfunction of the dome light
Malfunction of the horn
Malfunction of ETACS-ECU

DIAGNOSIS

STEP 1. Verify the operation hazard warning light

Check that the hazard warning light illuminate normally.

Q. 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.

Q. 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.

Q. 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 keyless operation key and check that all doors lock and unlock.

Q. Is the check result normal?

	Go to Step 5.

	Refer to inspection procedure 14: "Keyless entry system does not work ."

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?

	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.

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

Q. 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. 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)

."
(2)Turn the ignition switch to the "ON" position.
(3)Check whether the KOS-ECU related DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

Diagnose the KOS-ECU. Refer to

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?

	The diagnosis is complete.

	Replace ETACS-ECU.