Inspection Procedure 16

Inspection Procedure 16: Keyless Entry Hazard Light Answer Back Function, The Dome Light Answer Back Function Or The Horn Answer Back 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 answer back function, dome light answer back function or horn answer back function operate as set by ETACS customization function (If the flashing count is set to 0 with a customization function, no answer back 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 : Refer to - inspection procedure 1: "Hazard warning light does not illuminate." 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 : Refer to - inspection procedure 1 "The front dome light does not illuminate normally." Inspection Procedure 1 or inspection procedure 2 "The rear dome light does not illuminate normally." Inspection Procedure 2

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 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 14: "Keyless entry system does not work." Inspection Procedure 14

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. Customization 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. Customization Function

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 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. Diagnostic Trouble Code Descriptions

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 : The diagnosis is complete.

NO : Replace ETACS-ECU.