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Home >> Mitsubishi >> 2003 >> Eclipse L4-2.4L SOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Symptom Diagnostic Procedures >> M - Charts >> Inspection Procedure M-1

Inspection Procedure M-1

Interior Light: Dome Light, Luggage Compartment Light , Trunk Light And Door-ajar Indicator Light Does Not Illuminate Or Turn Off Normally.

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."

Interior Light Automatic Shut-down Function Circuit:






CIRCUIT OPERATION
The ETACS-ECU illuminates the dome light, the luggage compartment light and the trunk light according to the following signals:
- Ignition switch (IG1): ON or OFF
- Key reminder switch: ON or OFF
- Front door switch: ON or OFF
- Driver's door lock actuator switch: ON or OFF
- Liftgate latch switch (vehicles with theft-alarm system) or liftgate light switch (vehicles without theft-alarm system): 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)
If the dome light, the luggage compartment light and trunk light do not illuminate normally, the dome light bulb(s) may be burned out or the input circuit system from the switches, the power supply lines to the switches or the ETACS-ECU may be defective (refer to "CIRCUIT OPERATION").

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 the liftgate latch switch or liftgate light switch
- 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 COMM 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. Turn the ignition switch to the "LOCK" (OFF) position.
4. Operate the MUT-II according to the procedure below to display "ECU COMM CHECK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHECK."
5. 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 "DATA LIST" of the SWS monitor.
Check the input signals from the following switches:
- Ignition switch: ON or START
- Driver's or front passenger's door: open Operate the MUT-II 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: Does the scan tool display the items "IG SW (IG1)" and "FRONT DOOR SW" as normal condition?

YES: Go to Step 3.

NO:
- The scan tool does not show the respective normal condition for item "IG SW (IG1)." Refer to Inspection procedure O-2 "ETACS-ECU does not receive a 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 O-6 "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
- Liftgate latch switch or liftgate light switch
- Trunk lid latch switch or trunk light switch
- interior light loaded signal

Operate the MUT-II according to the procedure below to display "PULSE CHECK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."




Check if scan tool MB991502 sounds or not.

Q: When the key reminder switch, liftgate latch switch or liftgate light switch , and the trunk lid latch switch or trunk light switch and the interior light loaded signal 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 P-1 "ETACS-ECU does not receive a signal from the key reminder switch."
- When the liftgate or trunk lid is opened and closed, scan tool MB991502 does not sound: Refer to Inspection Procedure P-9 "ETACS-ECU does not receive a signal from the liftgate latch switch or trunk lid latch switch ."
- When one of the interior lights is illuminated, scan tool MB991502 does not sound: Refer to Inspection Procedure P-14 "ETACS-ECU does not receive any multi-purpose fuse No.17 loaded signal."
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