Inspection Procedure K-2
Interior Light: The front dome light, rear dome light or trunk light do not illuminate or go out normally.Part 1:
Part 2:
CIRCUIT OPERATION
The ETACS-ECU operates the dome light according to the following signals:
- Ignition switch (IG1): ON or OFF
- Key reminder switch: ON or OFF
- Door switches: ON or OFF
- Trunk lid latch assembly: ON or OFF
- Driver s door lock actuator switch: LOCK or UNLOCK
TECHNICAL DESCRIPTION (COMMENT)
Is the dome light does not flash normally, a burned-out dome light bulb, the input circuits from the switches described in "1mCIRCUIT OPERATION", the power supply line to the switches or the ETACS-ECU may be defective.
TROUBLESHOOTING HINTS
- The front dome light bulb may be defective
- The rear dome light bulb may be defective
- The trunk light bulb may be defective
- 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
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991910: MUT-III Main Harness A
STEP 1. Check which of the front dome light, rear dome light or trunk light do not illuminate normally.
Q : Which of the front dome light, rear dome light or trunk light fail to illuminate normally?
Front dome light and rear dome light : Go to Step 2.
Front dome light : Go to Step 4.
Rear dome light : Go to Step 9.
Trunk light : Go to Step 14.
STEP 2. Check map light assembly connector D-02
Q : Is map light assembly connector D-02
YES : Go to Step 3.
NO : Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Check that the front dome light and rear dome light illuminates normally.
STEP 3. Check the wiring harness between map light assembly connector D-02 (terminals 1 and 2)
Q : Is the wiring harness between map light assembly connector D-02 (terminals 1 and 2)
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. Check that the front dome light and rear dome light illuminates normally.
STEP 4. Check map light assembly connector D-02
Q : Is map light assembly connector D-02
YES : Go to Step 5.
NO : Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Check that the front dome light illuminates normally.
STEP 5. Check the front dome light bulb.
Q : Is the front dome light bulb in good condition?
YES : Go to Step 6.
NO : Replace the front dome light bulb. Check that the front dome light illuminates normally.
STEP 6. Check the ground circuit to the front dome light. Measure the resistance at map light assembly connector D-02
1. Disconnect map light assembly connector D-02
2. Measure the resistance value between terminal 3 and ground.
- The resistance should be 2 ohms or less.
Q : Is the measured resistance 2 ohms or less?
YES : Go to Step 8.
NO : Go to Step 7.
STEP 7. Check the wiring harness between map light assembly connector D-02 (terminal 3)
Q : Is the wiring harness between map light assembly connector D-02 (terminal 3)
YES : Replace the overhead console assembly. Check that the front dome 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. Check that the front dome light illuminates normally.
STEP 8. Check the wiring harness between map light assembly connector D-02 (terminals 1 and 2)
Q : Is the wiring harness between map light assembly connector D-02 (terminals 1 and 2)
YES : Replace the map light assembly
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. Check that the front dome light illuminates normally.
STEP 9. Check rear dome light connector D-07 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q : Is rear dome light connector D-07 in good condition?
YES : Go to Step 10.
NO : Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Check that the rear dome light illuminates normally.
STEP 10. Check the rear dome light bulb.
Q : Is the rear dome light bulb in good condition?
YES : Go to Step 11.
NO : Replace the rear dome light bulb. Check that the rear dome light illuminates normally.
STEP 11. Check the ground circuit to the rear dome light. Measure the resistance at rear dome light connector D-07.
1. Disconnect rear dome light connector D-07 and measure the resistance available at the wiring harness side of the connector.
2. Measure the resistance value between terminal 3 and ground.
- The resistance should be 2 ohms or less.
Q : Is the measured resistance 2 ohms or less?
YES : Go to Step 13.
NO : Go to Step 12.
STEP 12. Check the wiring harness between rear dome light connector D-07 and ground.
NOTE: Also check intermediate connector D-37 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-37 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.
Q : Is the wiring harness between rear dome light connector D-07 and ground in good condition?
YES : Replace the rear dome light. Check that the rear dome 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. Check that the rear dome light illuminates normally.
STEP 13. Check the wiring harness between rear dome light connector D-07 (terminals 1 and 2) and ETACS-ECU connector C-219 (terminals 6 and 5).
NOTE: Also check intermediate connector D-37 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-37 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.
Q : Is the wiring harness between rear dome light connector D-07 (terminals 1 and 2) and ETACS-ECU connector C-219 (terminals 6 and 5) in good condition?
YES : Replace the rear dome light. Check that the rear dome 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. Check that the rear dome light illuminates normally.
STEP 14. Check the input signal (by using the pulse check mode of the monitor).
Check the input signals from the trunk lid latch assembly.
- Check whether scan tool MB991958 sounds or not when the trunk is opened.
1. Operate scan tool MB991958 according to the procedure below to display "Pulse checking."
a. Select "Interactive Diagnosis."
b. Select "System Select."
c. Select "SWS."
d. Select "Pulse Checking."
Q : Does scan tool MB991958 sound when the trunk is opened and closed?
YES : Go to Step 15.
NO : Refer to Inspection Procedure N-7 "ETACS-ECU does not receive any signal from the trunk lid latch assembly."
STEP 15. Check trunk light connector D-10, ETACS-ECU connectors C-218 and C-219 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q : Is trunk light connector D-10, ETACS-ECU connectors C-218 and C-219 in good condition?
YES : Go to Step 16.
NO : Repair or replace the damaged component(s). Refer to Harness Connector Inspection. Check that the trunk light illuminates normally.
STEP 16. Check the trunk light bulb.
Q : Is the trunk light bulb in good condition?
YES : Go to Step 17.
NO : Replace the trunk light bulb. Check that the trunk light illuminates normally.
STEP 17. Check the wiring harness between trunk light connector D-10 (terminals 1 and 2) and ETACS-ECU connector C-219 (terminal 6) or C-218 (terminal 52).
NOTE: Also check intermediate connector C-28 and junction block connector C-204 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector C-28 or junction block connector C-204 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.
Q : Is the wiring harness between trunk light connector D-10 (terminals 1 and 2) and ETACS-ECU connector C-219 (terminal 6) or C-218 (terminal 52) in good condition?
YES : Replace the trunk light. Check that the trunk 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. Check that the trunk light illuminates normally.