Inspection Procedure 14

Inspection Procedure 14: 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 customization 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?

YES Go to Step 2.
NO Inspection Procedure 1."
STEP 2. Verify the operation of the dome light.

Check that the dome lights illuminate normally.

Q. Is the check result normal?

YES Go to Step 3.
NO Inspection Procedure 1." or inspection procedure 2 "The rear dome light does not illuminate normally Inspection Procedure 2 [Vehicles Without Sunroof]."
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 keyless operation key and check that all doors lock and unlock.

Q. Is the check result normal?

YES Go to Step 5.
NO Refer to inspection procedure 12: "Keyless entry system does not work Inspection Procedure 15."
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 (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 keyless entry system [vehicles without auto light]" or "Horn chirp by keyless entry system [vehicles with auto light]" with a customization function.

[Vehicles without auto light]

- Lock any time
- W lock any time

[Vehicles with auto light]

- Lock any time
- Lock/auto ON
- W lock any time

Q. Is the check result normal?

YES Go to Step 7.
NO Set "Horn chirp by keyless entry system [vehicles without auto light]"
or "Horn chirp by keyless entry system [vehicles with auto light]" 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 KOS-ECU related DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Diagnose the KOS-ECU. Refer to Keyless Operation System (KOS).

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 The diagnosis is complete.
NO Replace ETACS-ECU.