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

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.

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 component(s) 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 light 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 ."