Inspection Procedure K-2

INSPECTION PROCEDURE K-2: Interior Light: The map light, rear dome light or trunk light do not illuminate or go out normally.

Interior Light Circuit (Part 1):

Interior Light Circuit (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 "CIRCUIT OPERATION", the power supply line to the switches or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- The map 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
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Check which of the map light, rear dome light or trunk light do not illuminate normally.

Q: Which of the map light, rear dome light or trunk light fail to illuminate normally?

Map light and rear dome light : Go to Step 2.
Map 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 [without sunroof], overhead console assembly connector D-03 [with sunroof] and ETACS-ECU connector C-219 for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is map light assembly connector D-02 [without sunroof], overhead console assembly connector D-03 [with sunroof] and ETACS-ECU connector C-219 in good condition?

YES : Go to Step 3.

NO : Repair or replace the damaged component(s). Check that the map light and rear dome light illuminates normally.

STEP 3. Check the wiring harness between map light assembly connector D-02 (terminals 1 and 2) [without sunroof] or overhead console assembly connector D-03 (terminals 1 and 2) [with sunroof] and ETACS-ECU connector C-219 (terminals 6 and 5).

- Check the communication lines for open circuit and short circuit.







Q: Is the wiring harness between map light assembly connector D-02 (terminals 1 and 2) [without sunroof] or overhead console assembly connector D-03 (terminals 1 and 2) [with sunroof] and ETACS-ECU connector C-219 (terminals 6 and 5) 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. Check that the map light and rear dome light illuminates normally.

STEP 4. Check map light assembly connector D-02 [without sunroof] or overhead console assembly connector D-03 [with sunroof] for loose, corroded or damaged terminals, or terminals pushed back in the connector.







Q: Is map light assembly connector D-02 [without sunroof] or overhead console assembly connector D-03 [with sunroof] in good condition?

YES : Go to Step 5.

NO : Repair or replace the damaged component(s). Check that the map light illuminates normally.

STEP 5. Check the map light bulb.

Q: Is the map light bulb in good condition?

YES : Go to Step 6.

NO : Replace the map light bulb. Check that the map light illuminates normally.

STEP 6. Check the ground circuit to the map light. Measure the resistance at map light assembly connector D-02 [without sunroof] or overhead console assembly connector D-03 [with sunroof].







1. Disconnect map light assembly connector D-02 [without sunroof] or overhead console assembly connector D-03 [with sunroof] 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 8.

NO : Go to Step 7.

STEP 7. Check the wiring harness between map light assembly connector D-02 (terminal 3) [without sunroof] or overhead console assembly connector D-03 (terminal 3) [with sunroof] and ground.

- Check the ground wire for open circuit.







Q: Is the wiring harness between map light assembly connector D-02 (terminal 3) [without sunroof] or overhead console assembly connector D-03 (terminal 3) [with sunroof] and ground in good condition?

YES : Replace the overhead console assembly. Check that the map 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 map light illuminates normally.

STEP 8. Check the wiring harness between map light assembly connector D-02 (terminals 1 and 2) [without sunroof] or overhead console assembly connector D-03 (terminals 1 and 2) [with sunroof] and ETACS-ECU connector C-219 (terminals 6 and 5).

- Check the communication lines for open circuit and short circuit.







Q: Is the wiring harness between map light assembly connector D-02 (terminals 1 and 2) [without sunroof] or overhead console assembly connector D-03 (terminals 1 and 2) [with sunroof] and ETACS-ECU connector C-219 (terminals 6 and 5) in good condition?

YES : Replace the map light assembly [without sunroof] or overhead console assembly [with sunroof]. Check that the map 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 map 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). 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.

- Check the ground wire for open circuit.







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.

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).

- Check the communication lines for open circuit and short circuit.







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.

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-6 "ETACS-ECU does not receive any signal from the trunk lid latch assembly." Inspection Procedure N-6

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). 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).

- Check the communication lines for open circuit and short circuit.












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.

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.