Inspection Procedure E-2

INSPECTION PROCEDURE E-2: Keyless Entry System: The interior lights, the hazard warning lights and the horn do not operate through the answerback function.

TECHNICAL DESCRIPTION (COMMENT)
The turn-signal light and the horn answerback functions can be selected by the driver's desire (can be deactivated). However, the interior lights answerback function can not be deactivated. If all of these devices do not operate through the answerback function, the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- .The turn-signal light may be defective.
- the theft-alarm horn may be defective.
- The interior lights may be defective.
- The ETACS-ECU may be defective.
- The wiring harness or connectors may have loose, corroded or damaged terminals, or terminals pushed back in the connector.

DIAGNOSIS
Required Special Tools:
- MB991223: Test Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991529: Diagnostic Trouble Code Check Harness

STEP 1. Check the answerback set condition.
Activate the answerback functions. (Refer to Keyless Entry System - On-vehicle Service - Enabling/ disabling the Answerback Function.)

Q: Does the answerback function work normally?

YES : No action is necessary and testing is complete.

NO : Go to Step 2.

STEP 2. Retest the system.

Q: Which components) does not operate through the answerback?
- Only the interior lights : Go to Step 3.
- Only the hazard warning lights : Go to Step 4.
- Only the horn : Go to Step 5.
None of the interior lights, the turn-signal lights, and the horn : Replace the ETACS-ECU. The answerback function should work normally.

STEP 3. Check the interior lights dimming function.

Q: Does the interior lights dimming function work normally?

YES : Replace the ETACS-ECU. The answerback function should work normally.

NO : Refer to Inspection Procedure M-2 "Interior light dimming function does not work normally."

STEP 4. Check the hazard warning light operation.

Q: Do the hazard warning lights operate normally?

YES : Replace the ETACS-ECU. The answerback function should work normally.

NO : Refer to Inspection Procedure K-2 "Hazard warning lights do not flash when the hazard warning light switch is turned on."

STEP 5. Check the working of the horn by the theft-alarm system.

Q: Does the horn work normally by the theft-alarm system?

YES : Replace the ETACS-ECU. The answerback function should work normally.

NO : Refer to Inspection Procedure N-2 "Horn does not sound when the theft-alarm system is triggered