Inspection Procedure K-5

Interior Lamp: The Door Ajar Indicator Lights do not Illuminate or Extinguish Correctly

Door Indicator Light Circuit:

NOTE: This troubleshooting requires use of scan tool MB991502 and SWS monitor kit MB991862. For details of how to use the SWS monitor, refer to "How to use SWS monitor".

CIRCUIT OPERATION
The ETACS-ECU operates the door ajar indicator light according to the following switch signals:
- Front door switch
- All door switches

TECHNICAL DESCRIPTION (COMMENT)
If the door ajar indicator light does not illuminate normally, the input circuit system from the switches or the ETACS-ECU may be defective (refer to "CIRCUIT OPERATION").

TROUBLESHOOTING HINTS
- Malfunction of the door switch
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Test Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991862: SWS monitor kit

STEP 1. Check the dome light and the rear dome light.

If the dome light switch and the rear dome light switch are moved to the "door interlock position", the dome light and the rear dome light should illuminate when either door is opened.

Q: Do the dome light and the rear dome light illuminate normally?
Both the dome light and the rear dome light illuminate normally. : Go to Step 2.
Neither the dome light nor the rear dome light illuminates normally.: Refer to Inspection Procedure K-1 "Dome light, rear dome light and luggage compartment light do not illuminate or go out normally."
Either the dome light or the rear dome light illuminates normally.: Refer to Inspection Procedure K-2 "Dome light, rear dome light or luggage compartment light do not illuminates or goes out normally."

STEP 2. Check the input signal by using service data of the SWS monitor.

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502. Also connect SWS monitor kit MB991862 after turning on scan tool MB991502.

Open the driver's door before checking the input signals from the front door switch (LH).
1. Connect scan tool MB991502 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.










3. Select "ETACS ECU" (DATALIST), and check that normal conditions are displayed on the items described in the table.

Q: Is normal condition displayed on the "FRONT DOOR SW?

YES: Go to STEP 3.

NO: Refer to Inspection Procedure L-5 "ETACS-ECU does not receive a signal from the driver's or the front passenger's door switch."




STEP 3. Check the input signal (by using the Pulse check).

Check the input signals from all the door switches: If a door (except front doors) is opened and closed, check if scan tool MB991502 sounds or not.

Q: If a door (except front doors) is opened and closed, does scan tool MB991502 sound?

YES: Go to Step 4.

NO: Refer to Inspection Procedure M-4 "ETACS-ECU does not receive a signal from all the door switches."




STEP 4. Measure at combination meter connector C-01 in order to check the ETACS-ECU line of the power supply to the combination meter.

1. Disconnect combination meter connector C-01, and measure at the wiring harness side.
2. Measure the voltage between terminal 8 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).

Q: Does the measured voltage correspond with this range?

YES: Go to Step 7.

NO: Go to Step 5.







STEP 5. Check combination meter connector C-01 and ETACS-ECU connector C-228 for damage.

Q: Are combination meter connector C-01 and ETACS-ECU connector C-228 in good condition?

YES: Go to Step 6.

NO: Repair or replace the connector. Refer to Harness Connector Inspection, Check that the door ajar indicator light illuminates normally.







STEP 6. Check the wiring harness between combination meter connector C-01 and ETACS-ECU connector C-228.

Q: Is the wiring harness between combination meter connector C-01 and ETACS-ECU connector C-228 in good condition?

YES: No action to be taken.

NO: Repair the wiring harness. Check that the door ajar indicator light illuminates normally.







STEP 7. Check combination meter connector C-02 and ETACS-ECU connector C-228 for damage.

Q: Are combination meter connector C-02 and ETACS-ECU connector C-228 in good condition?

YES: Go to Step 8.

NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the door ajar indicator light illuminates normally.







STEP 8. Check the wiring harness between combination meter connector C-02 and ETACS-ECU connector C-228.

Q: Is the wiring harness between combination meter connector C-02 and ETACS-ECU connector C-228 in good condition?

YES: Replace the ETACS-ECU. Check that the door ajar indicator light illuminates normally.

NO: Repair the wiring harness. Check that the door ajar indicator light illuminates normally.