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Inspection Procedure L-1



Interior Light: The Dome Light, Trunk Light and Door-ajar Indicator Light do not Illuminate and Go out Normally.

Interior Light Automatic Shut-down Function Circuit:






CIRCUIT OPERATION
The ETACS-ECU operates the dome light and trunk light according to the following signals:
- Ignition switch (IG1): ON or OFF
- Key reminder switch: ON or OFF
- Driver's door switch: ON or OFF
- All door switches: ON or OFF
- Driver's door lock actuator switch: ON or OFF
- Trunk lid latch switch (vehicles with theft-alarm system) or trunk light switch (vehicles without theft-alarm system): ON or OFF
- Interior light loaded signal: ON

TECHNICAL DESCRIPTION (COMMENT)
Is the dome light and the trunk light do not illuminate normally, a burned-out dome light bulb, the input circuits from the switches described in "CIRCUIT OPERATION", the power supply line to the switches or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the key reminder switch
- Malfunction of the door switch
- Malfunction of the driver's door lock actuator switch
- Malfunction of the dome light
- Malfunction of trunk lid latch switch or trunk light 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. Use scan tool to select "ECU CHECK" on the SWS monitor display.

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.




1. Connect scan tool MB991502 to the data link connector.




2. Connect SWS monitor kit MB991862 to the column switch connector.
3. When the ignition switch is turned to the "LOCK" (OFF) position, scan tool MB991502 should show "OK" on the "ETACS ECU" menu.

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

YES: Go to Step 2.

NO: Refer to Inspection Procedure A-3 "Communication with ETACS-ECU is impossible."










STEP 2. Check the input signal by using service data of the SWS monitor.
Check the input signals from the following switches:
- Ignition switch: ON or START
- Driver's door: open

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

Q: Does the scan tool display the items "IG SW (IG1)" and "DR DOOR SW" as normal condition?

YES: Go to Step 3.

NO:
- Normal condition is not displayed "IG SW (IG1)":
Refer to Inspection Procedure N-2 "ETACS-ECU does not receive a signal from the ignition switch (IG1)."
- Normal condition is not displayed "DR DOOR SW": Refer to Inspection Procedure N-4 "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 following switches and input signals:
- Key reminder switch
- All door switch
- Trunk lid latch switch or trunk light switch
- Interior light loaded signal

If the switches which are applicable for the input signal check, are operated, check if scan tool MB991502 sounds or not.

Q: When the key reminder switch, any door switch, the trunk lid latch switch or trunk light switch or interior light is operated, does scan tool MB991502 sound?

YES: Replace the ETACS-ECU. Check that the dome light illuminates normally.

NO:
- Scan tool MB991502 does not sound when the ignition key is removed and reinserted: Refer to Inspection Procedure O-1 "ETACS-ECU does not receive a signal from the key reminder switch."
- When one of the doors is opened and closed, scan tool MB991502 does not sound: Refer to Inspection Procedure O-4 "ETACS-ECU does not receive a signal from all the door switches ."
- When the trunk lid is opened and closed, scan tool MB991502 does not sound: Refer to Inspection Procedure O-9 "ETACS-ECU does not receive a signal from the trunk lid latch switch or trunk lid light switch."
- When one of the interior lights is illuminated, scan tool MB991502 does not sound: Refer to Inspection Procedure O-12 "ETACS-ECU does not receive a interior light loaded signal."
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