Inspection Procedure M-2
Interior Light: The Dome Light, Luggage Compartment LightInterior Lights Circuit Part 1:
Interior Lights 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
- 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: Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicles communication interface
- MB991827: MUT-III USB cable
- MB991911: MUT-III Main harness B
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 (terminal 3)
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 (terminal 3)
YES: No action to be taken.
NO: Repair the wiring harness. Check that the dome light illuminates normally.
STEP 6. Measure at dome light connector D-04
1. Disconnect dome light connector D-04
2. Measure the resistance value between 1
- The measured value should be 2 ohm or less.
Q: Does the measured resistance value correspond with this range?
YES: Go to Step 9.
NO: Go to Step 7.
STEP 7. Check dome light connectors D-04
Q: Are dome light connector D-04
YES: Go to Step 8.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the dome light illuminates normally.
STEP 8. Check the wiring harness between dome light connector D-04 (terminal 3)
Q: Is the wiring harness between dome light connector D-04 (terminal 3)
YES: No action to be taken.
NO: Repair the wiring harness. Check that the dome light illuminates normally.
STEP 9. Check dome light connectors D-04
Q: Are dome light connector D-04
YES: Go to Step 10.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the dome light illuminates normally.
STEP 10. Check the wiring harness between dome light connector D-04 (terminal 2)
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 (terminal 2)
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 11. Check the luggage compartment light bulb.
Q: Is the luggage compartment light bulb in good condition?
YES: Go to Step 12.
NO: Replace the bulb. Check that the luggage compartment lights illuminate normally.
STEP 12. 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 15.
NO: Go to Step 13.
STEP 13. 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 14.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the luggage compartment lights illuminate normally.
STEP 14. Check the wiring harness between luggage compartment light connector F-21 (terminal 1) and ETACS-ECU connector C-119 (terminal 6).
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 (terminal 1) and ETACS-ECU connector C-119 (terminal 6) in good condition?
YES: No action to be taken.
NO: Repair the wiring harness. Check that the luggage compartment lights illuminate normally.
STEP 15. 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 16.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the luggage compartment lights illuminate normally.
STEP 16. Check the wiring harness between luggage compartment light connector F-21 (terminal 2) and ETACS-ECU connector C-118 (terminal 52).
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 (terminal 2) and ETACS-ECU connector C-118 (terminal 52) in good condition?
YES: Go to Step 17.
NO: Repair the wiring harness. Check that the luggage compartment lights illuminate normally.
STEP 17. Check the input signal (by using the Pulse check mode of the monitor).
Check the input signal of the liftgate latch switch
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.
1. Connect scan tool MB991958 to the data link connector.
2. 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."
3. When the liftgate is opened and closed, check if scan tool MB991958 sounds or not.
Q: When the liftgate is opened and closed, does scan tool MB991958 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 18. Check the trunk light bulb.
Q: Is the luggage compartment bulb in good condition?
YES: Go to Step 19.
NO: Replace the bulb. Check that the trunk lights illuminate normally.
STEP 19. 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 22.
NO: Go to Step 20.
STEP 20. 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 21.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the trunk lights illuminate normally.
STEP 21. Check the wiring harness between trunk light connector F-21 (terminal 1) and ETACS-ECU connector C-119 (terminal 6).
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 (terminal 1) and ETACS-ECU connector C-119 (terminal 6) in good condition?
YES: No action to be taken.
NO: Repair the wiring harness. Check that the trunk lights illuminate normally.
STEP 22. 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 23.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. Check that the trunk lights illuminate normally.
STEP 23. Check the wiring harness between trunk light connector F-21 (terminal 2) and ETACS-ECU connector C-118 (terminal 52).
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 (terminal 2) and ETACS-ECU connector C-118 (terminal 52) in good condition?
YES: Go to Step 24.
NO: Repair the wiring harness. Check that the trunk lights illuminate normally.
STEP 24. Check the input signal (by using the pulse check mode of the monitor).
Check the input signal of the trunk lid latch switch
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.
1. Connect scan tool MB991958 to the data link connector.
2. 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."
3. When the trunk lid is opened and closed, check if scan tool MB991958 sounds or not.
Q: When the trunk lid is opened and closed, does scan tool MB991958 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 liftgate latch switch