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Home >> Mitsubishi >> 2006 >> Lancer Evolution L4-2.0L DOHC Turbo >> Repair and Diagnosis >> Body and Frame >> Body Control Systems >> Testing and Inspection >> Symptom Related Diagnostic Procedures >> Symptom Diagnostic Procedures >> Inspection Procedure M-6

Inspection Procedure M-6

Interior Light: The ignition key cylinder illumination light does not illuminate or go out normally.

NOTE: This troubleshooting procedure requires the use of scan tool MB991958 and SWS monitor kit MB991813. For details on how to use the SWS monitor, refer to "How to use SWS monitor."

Ignition Key Cylinder Illumination Light Circuit:






CIRCUIT OPERATION
- When the driver's door is opened with the ignition switch at "ACC" position, the ETACS-ECU illuminates the ignition key cylinder illumination light.
- The ignition key cylinder illumination light goes out in 30 seconds after the driver's door is closed. The ignition key cylinder illumination light remains illuminated for 30 seconds after the ignition key is pulled out.
- The ETACS-ECU operates the ignition key cylinder illumination light according to the input signals from the following switches:
- Ignition switch (IG1): OFF
- Key reminder switch: OFF
- Interior light loaded signal: ON
- Vehicle condition:
- Ignition switch: "LOCK" (OFF) or "ACC" position
- Ignition key: Removed from the ignition key cylinder
- Driver's door: Opened, then closed

TECHNICAL DESCRIPTION (COMMENT)
Is the ignition key cylinder illumination light does not illuminate, the input circuits from the switches described in "CIRCUIT OPERATION", the key reminder switch (ignition key cylinder illumination light bulb) or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- Trouble in input signal system
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector.
- The ETACS-ECU may be defective.

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991911: M.U.T.-III Main Harness B
- MB991813: SWS monitor kit
- MB991806: SWS monitor cartridge
- MB991812: SWS monitor harness (for column-ECU)
- MB991922: Probe harness

STEP 1. Use scan tool MB991958 to select "ECU COMM Check" on the SWS monitor display.
Check the ETACS-ECU.

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect special tool MB991911 before connecting special tool MB991812. Be sure to connect special tool MB991806 after turning on special tool MB991824.




1. Connect the special tool. Refer to "How to connect SWS monitor ".
2. Turn the ignition switch to the "LOCK" (OFF) position.
3. Operate scan tool MB991958 according to the procedure below to display "ECU COMM Check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "ECU COMM Check."

4. Scan tool MB991958 should show "OK" on the "ECU COMM Check" menu for 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 the ETACS-ECU is not possible."

STEP 2. Check the input signal by using "DATA LIST" menu of the SWS monitor.
Check the input signals from the following switches:
- Ignition switch: OFF
- Driver's door: open
- Front passenger's door: closed




1. Operate scan tool MB991958 according to the procedure below to display "ETACS ECU."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Data List."
f. Select "ETACS ECU."




2. 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 : Refer to Inspection Procedure N-2 "The ETACS-ECU does not receive any signal from the ignition switch (IG1)."

NO: : Refer to Inspection Procedure N-5 "The ETACS-ECU does not receive any signal from the front door switches."

STEP 3. Check the input signal (by using the Pulse check mode of the monitor).
Check the following switches and input signals:
- Key reminder switch
- Interior light loaded signal




1. Operate scan tool MB991958 according to the procedure below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."




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

Q: When the key reminder switch and the interior light are operated, does scan tool MB991958 sound in each case?

YES: : Go to Step 4.

NO key is removed> : Refer to Inspection Procedure O-1 "The ETACS-ECU does not receive any signal from the key reminder switch."

NO: : Refer to Inspection Procedure O-10 "The ETACS-ECU does not receive any interior light loaded signal."




STEP 4. Check key reminder switch connector C-207 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is key reminder switch connector C-207 in good condition?

YES: Go to Step 5.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the ignition key cylinder illumination light illuminates normally.

STEP 5. Check the ignition key cylinder illumination light bulb.

Q: Is the ignition key cylinder illumination light bulb in good condition?

YES: Go to Step 6.

NO: Replace the bulb. Verify that the ignition key cylinder illumination light illuminates normally.

STEP 6. Check the key reminder switch (ignition key hole illumination).




1. Disconnect key reminder switch connector C-207.
2. Remove the ignition key cylinder illumination light bulb. Then measure the resistance value between the bulb terminals.
3. Install a bulb to the key remainder switch, and measure the resistance between connector C-207 terminals 1 and 2. The measured resistance value should be roughly the same as the value measured in Step (2).

Q: Are these two resistance values extremely different?

YES: Replace the key reminder switch. Verify that the ignition key cylinder illumination light illuminates normally.

NO: (much the same): Go to Step 7.

STEP 7. Check the battery power supply circuit to the key reminder switch (ignition key cylinder illumination light). Measure the voltage at key reminder switch connector C-207.




1. Disconnect key reminder switch connector C-207 and measure the voltage available at the wiring harness side of the connector.




2. Measure the voltage between terminal 2 and ground.
- The voltage should measure approximately 12 volts (battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery positive voltage)?

YES: Go to Step 10.

NO: Go to Step 8.




STEP 8. Check ETACS-ECU connector C-228 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-228 in good condition?

YES: Go to Step 9.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that the ignition key cylinder illumination light illuminates normally.










STEP 9. Check the wiring harness between key reminder switch connector C-207 (terminal 2) and ETACS-ECU connector C-228 (terminal 71).

NOTE: Also check joint connector C-23 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If joint connector C-23 is damaged, repair or replace the connector as described in Harness Connector Inspection.

Q: Is the wiring harness between key reminder switch connector C-207 (terminal 2) and ETACS-ECU connector C-228 (terminal 71) in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the ignition key cylinder illumination light illuminates normally.




STEP 10. Check ETACS-ECU connector C-228 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-228 in good condition?

YES: Go to Step 11.

NO: Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Verify that the ignition key cylinder illumination light illuminates normally.







STEP 11. Check the wiring harness between key reminder switch connector C-207 (terminal 1) and ETACS-ECU connector C-228 (terminal 69).

Q: Is the wiring harness between key reminder switch connector C-207 (terminal 1) and ETACS-ECU connector C-228 (terminal 69) in good condition?

YES: Replace the ETACS-ECU. Verify that the ignition key cylinder illumination light illuminates normally.

NO: The wiring harness may be damaged or the connector(s) may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the ignition key cylinder illumination light illuminates normally.
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