Inspection Procedure M-2
Interior Light: The Dome Light, Luggage Compartment Light
Interior Lights Circuit:
Connectors:
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
- Front door switch: 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
- 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 ETACS-ECU
- Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools:
- MB991223: Test Harness Set
- MB991502: Scan Tool (MUT-II)
STEP 1. Check which of the dome light, the luggage compartment light
Q: Which of the dome light, the luggage compartment light
dome light does not illuminate normally; Go to Step 2.
luggage compartment light
trunk light
STEP 2. Check the dome light bulb.
Q: Is the dome light bulb in good condition?
YES: Go to Step 3.
NO: Replace the bulb. Check that the dome light illuminates normally.
STEP 3. Measure at dome light connector D-04
1. Disconnect dome light connector D-04
2. Measure the voltage between terminal 3
- The measured value should be approximately 12 volts (battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES: Go to Step 6.
NO: Go to Step 4.
STEP 4. Check dome light connectors D-04
Q: Are dome light connector D-04
YES: Go to Step 5.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the dome light illuminates normally.
STEP 5. Check the wiring harness between dome light connector D-04
NOTE: Also check junction block connector C-102. If junction block connector C-102 is damaged, repair or replace the connector as described in Harness Connector Inspection.
Q: Is the wiring harness between dome light connector D-04
YES: No action to be taken.
NO: Repair the wiring harness. Check that the dome light illuminates normally.
STEP 6. Check dome light connectors D-04
Q: Are dome light connector D-04
YES: Go to Step 7.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the dome light illuminates normally.
STEP 7. Check the wiring harness between dome light connector D-04
NOTE: Also check junction block connector C-102. If junction block connector C-102 is damaged, repair or replace the connector as described in Harness Connector Inspection.
Q: Is the wiring harness between dome light connector D-04
YES: Replace the ETACS-ECU. Check that the dome light illuminates normally.
NO: Repair the wiring harness. Check that the dome light illuminates normally.
STEP 8. Check the luggage compartment light bulb.
Q: Is the luggage compartment light bulb in good condition?
YES: Go to Step 9.
NO: Replace the bulb. Check that the luggage compartment lights illuminate normally.
STEP 9. Measure at luggage compartment light connector F-21 in order to check the ETACS-ECU line of the power supply to the luggage compartment light.
1. Disconnect luggage compartment light connector F-21, and measure at the wiring harness side.
2. Measure the voltage between terminal 1 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES: Go to Step 12.
NO: Go to Step 10.
STEP 10. Check luggage compartment light connectors F-21 and ETACS-ECU connector C-119 for damage.
Q: Are luggage compartment light connector F-21 and ETACS-ECU connector C-119 in good condition?
YES: Go to Step 11.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the luggage compartment lights illuminate normally.
STEP 11. Check the wiring harness between luggage compartment light connector F-21 and ETACS-ECU connector C-119.
NOTE: Also check junction block connector C-101. If junction block connector C-101 is damaged, repair or replace the connector as described in Harness Connector Inspection.
Q: Is the wiring harness between luggage compartment light connector F-21 and ETACS-ECU connector C-119 in good condition?
YES: No action to be taken.
NO: Repair the wiring harness. Check that the luggage compartment lights illuminate normally.
STEP 12. Check luggage compartment light connectors F-21 and ETACS-ECU connector C-118 for damage.
Q: Are luggage compartment light connector F-21 and ETACS-ECU connector C-118 in good condition?
YES: Go to Step 13.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the luggage compartment lights illuminate normally.
STEP 13. Check the wiring harness between luggage compartment light connector F-21 and ETACS-ECU connector C-118.
NOTE: Also check intermediate connector C-90. If intermediate connector C-90 is damaged, repair or replace the connector as described in Harness Connector Inspection.
Q: Is the wiring harness between luggage compartment light connector F-21 and ETACS-ECU connector C-118 in good condition?
YES: Go to Step 14.
NO: Repair the wiring harness. Check that the luggage compartment lights illuminate normally.
STEP 14. Check the input signal by using the Pulse check.
Check the input signal of the liftgate latch switch
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.
1. Connect scan tool MB991502 to the data link connector.
2. When the liftgate is opened and closed, check if scan tool MB991502 sounds or not.
Q: When the liftgate is opened and closed, does scan tool MB991502 sound?
YES: Replace the ETACS-ECU. Check that the luggage compartment lights illuminate normally.
NO: Refer to Inspection Procedure P-9 "ETACS-ECU does not receive a signal from the liftgate latch switch."
STEP 15. Check the trunk light bulb.
Q: Is the luggage compartment bulb in good condition?
YES: Go to Step 16.
NO: Replace the bulb. Check that the trunk lights illuminate normally.
STEP 16. Measure at trunk light connector F-21 in order to check the ETACS-ECU line of the power supply to the trunk light.
1. Disconnect trunk light connector F-21, and measure at the wiring harness side.
2. Measure the voltage between terminal 1 and ground.
- The measured value should be approximately 12 volts (battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES: Go to Step 19.
NO: Go to Step 17.
STEP 17. Check trunk light connector F-21 and ETACS-ECU connector C-119 for damage.
Q: Are trunk light connector F-21 and ETACS-ECU connector C-119 in good condition?
YES: Go to Step 18.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the trunk lights illuminate normally.
STEP 18. Check the wiring harness between trunk light connector F-21 and ETACS-ECU connector C-119.
NOTE: Also check junction block connector C-101. If junction block connector C-101 is damaged, repair or replace the connector as described in Harness Connector Inspection.
Q: is the wiring harness between trunk light connector F-21 and ETACS-ECU connector C-119 in good condition?
YES: No action to be taken.
NO: Repair the wiring harness. Check that the trunk lights illuminate normally.
STEP 19. Check trunk light connectors F-21 and ETACS-ECU connector C-118 for damage.
Q: Are trunk light connector F-21 and ETACS-ECU connector C-118 in good condition?
YES: Go to Step 20.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the trunk lights illuminate normally.
STEP 20. Check the wiring harness between trunk light connector F-21 and ETACS-ECU connector C-118.
NOTE: Also check intermediate connector C-90. If intermediate connector C-90 is damaged, repair or replace the connector as described in Harness Connector Inspection.
Q: Is the wiring harness between trunk light connector F-21 and ETACS-ECU connector C-118 in good condition?
YES: Go to Step 21.
NO: Repair the wiring harness. Check that the trunk lights illuminate normally.
STEP 21. Check the input signal by using the Pulse check.
Check the input signal of the trunk lid latch switch
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.
1. Connect scan tool MB991502 to the data link connector.
2. When the trunk lid is opened and closed, check if scan tool MB991502 sounds or not.
Q: When the trunk lid is opened and closed, does scan tool MB991502 sound?
YES: Replace the ETACS-ECU. Check that the trunk lights illuminate normally.
NO: Refer to Inspection Procedure P-9 "ETACS-ECU does not receive a signal from the trunk lid latch switch."