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Inspection Procedure L-3

Interior Light: Dome light and luggage area light dimming function does not work normally.

Interior Light Automatic Shutt-down Function Circuit:






NOTE: This troubleshooting procedure requires the use of scan tool MB991958and SWS monitor kit MB991862. For details on how to use the SWS monitor, refer to "How to use SWS monitor." How To Use SWS Monitor

CIRCUIT OPERATION
The ETACS-ECU operates the dome light dimming function according to the following switches:
- Ignition switch (IG1)
- Key reminder switch
- Front door switches
- Driver's door lock actuator switch.

TECHNICAL DESCRIPTION (COMMENT)
Is the dome lights do not dim normally, the input circuits from the switches described in "CIRCUIT OPERATION" or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- The key reminder switch may be defective
- The door switches may be defective
- The driver's door lock actuator switch 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: Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991911: MUT-III Main Harness B

- MB991862: SWS Monitor Kit

STEP 1. Verify the dome light and the luggage area light .
If the dome light switch and the luggage area light switch are moved to the "door interlock position", the dome light and the luggage area light should illuminate when either door is opened.

Q: Do the dome light and the luggage area light illuminate normally?

Both the dome light and the luggage area light illuminate normally.: Go to Step 2.

Neither the dome light nor the luggage area light illuminates normally. : Refer to Inspection Procedure L-1 "The dome light and luggage area light do not illuminate or go out normally."

Either the dome light or the luggage area light illuminates normally. : Refer to Inspection Procedure L-2 "The dome light or luggage area light does not illuminate or go out normally."

STEP 2. Use scan tool MB991958to select "ECU COMM CHK" on the SWS monitor display.
Check the ETACS-ECU.

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. Connect the DLC harness before connecting the column-ECU harness. Be sure to connect SWS monitor kit MB991862 after turning on scan tool MB991502.




1. Connect scan tool MB991958to the data link connector.




2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "LOCK" (OFF) position. (4) Operate scan tool MB991958according to the procedure below to display "ECU COMM CHK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."

5. Scan tool MB991958should show "OK" on the "ECU COMM CHK" menu for the "ETACS ECU" menu.

Q: Is "OK" displayed on the "ETACS ECU" menu?

YES : Go to Step 3.

NO : Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible."

STEP 3. Check the input signal by using "DATA LIST" menu of the SWS monitor.
Check the input signals from the following switches:
- Ignition switch: ON or START
- Driver's door: open







Operate scan tool MB991958 according to the procedure below to display "ETACS ECU."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "DATA LIST."
5. Select "ETACS ECU."




Check that normal conditions are displayed on the items described in the table.

Q: Are normal conditions displayed on the "IG SW (IG1)" and "FRONT DOOR SW"?

Normal conditions are displayed for all the items : Go to Step 4.

The scan tool does not show the respective normal condition for item "IG SW (IG1)" : Refer to Inspection Procedure M-2 "ETACS-ECU does not receive any signal from the ignition switch (IG1)."

The scan tool does not show the respective normal condition for item "FRONT DOOR SW" : Refer to Inspection Procedure M-4 "ETACS-ECU does not receive signals from the front door switches."

STEP 4. Check the input signal by using the pulse check mode of the monitor.
Check the following switches and input signals:
- Key reminder switch
- All door switches
- Interior light loaded signal




Operate scan tool MB991958according to the procedure below to display "PULSE CHECK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."




Check if scan tool MB991958 sounds or not.

Q: When the key reminder switch, each door switch and the interior light are operated, does scan tool MB991958sound in each case?

Buzzer of scan tool MB991958 sounds normally : Replace the ETACS-ECU. Verify that the dome light illuminates normally.

Scan tool MB991958 does not sound when the ignition key is removed and reinserted : Refer to Inspection Procedure N-1 "ETACS-ECU does not receive any signal from the key reminder switch."

When one of the doors is opened and closed, scan tool MB991958 does not sound : Refer to Inspection Procedure N-4 "ETACS-ECU does not receive any signal from all the door switches."

When one of the interior lights is illuminated, scan tool MB991958 does not sound : Refer to Inspection Procedure N-10 "ETACS-ECU does not receive any interior light loaded signal."
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