Inspection Procedure E-2

Keyless Entry System: The Dome Light, the Turn-signal Lights and the Horn do not Operate Through the Answerback Function.

CIRCUIT OPERATION
The ETACS-ECU operates the following functions when it receives lock or unlock signal from the transmitter:
- Dome light answerback function
- Hazard warning lights answerback function
- Horn answerback function

TECHNICAL DESCRIPTION (COMMENT)
The hazard warning lights and horn answerback functions can be disabled or enabled. (These functions can be disabled). However, the dome light answerback function can not be disabled.

TROUBLESHOOTING HINTS
- The hazard warning light may be defective
- The theft-alarm horn may be defective
- The horn may be defective
- The dome light 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
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicles communication interface (V.C.I.)
- MB991827: MUT-III USB cable
- MB991911: MUT-III Main harness B

STEP 1. Verify the keyless entry system.

Q: Does the keyless entry system work normally?

YES: Go to Step 2.

NO: Refer to Inspection Procedure E-1 "Keyless entry system does not work."

STEP 2. Check the configuration function.

Q: Has the answerback function been enabled by means of the adjustment function?

YES: Go to Step 3.

NO: Enable the answerback function by means of the adjustment function. Verify that the answerback functions work normally.

STEP 3. Verify trouble symptom.

Q: Which answerback function is defective?

Only the dome light: Go to Step 4.
Only the turn-signal lights: Go to Step 5.
Only the horns: Go to Step 6.
None of the dome light, the turn-signal lights, and the horn: Replace the ETACS-ECU. Verify that the answerback functions work normally.

STEP 4. Verify the dome light.

Q: Does the dome light illuminate normally?

YES: Replace the ETACS-ECU. Verify that the answerback functions work normally.

NO: Refer to Inspection Procedure M-1 "Dome light, luggage compartment light , trunk light and door-ajar indicator light does not illuminate or turn off normally."

STEP 5. Verify the hazard warning light.

Q: Does the hazard warning lights work normally?

YES: Replace the ETACS-ECU. Verify that the answerback functions 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 6. Verify the theft-alarm system (horn).

Q: Does the theft-alarm system work normally?

YES: Replace the ETACS-ECU. Verify that the answerback functions work normally.

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