Inspection Procedure 3
Inspection Procedure 3: The Luggage Compartment Light Does Not Illuminate Normally.Luggage Compartment Light Circuit:
TROUBLE JUDGMENT
The ETACS-ECU illuminates and extinguishes the luggage compartment light in accordance with the input signals below.
- Ignition switch (IG1)
- Key reminder switch
- Door switches
- Liftgate latch switch
- Front door lock actuator
TECHNICAL DESCRIPTION (COMMENT)
If this does not work normally, the above switch input circuit(s), luggage compartment light, or ETACS-ECU may have a problem.
TROUBLESHOOTING HINTS
- Malfunction of the key reminder switch
- Malfunction of door switch
- Malfunction of liftgate latch switch
- Malfunction of the front door lock actuator
- Malfunction of luggage compartment light
- Malfunction of the ETACS-ECU
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
DIAGNOSIS
Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: M.U.T.-III USB Cable
- B991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)
STEP 1. Using scan tool MB991958, read the diagnostic trouble code.
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. Refer to "How to connect scan tool (M.U.T.-III)." Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Check whether the ETACS-ECU related DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Diagnose the ETACS-ECU. Diagnostic Trouble Code Descriptions
NO : Go to Step 2.
STEP 2. Using scan tool MB991958, check data list.
Use the ETACS-ECU service data to check the signals related to the operation of luggage compartment light.
- Turn the ignition switch to the "LOCK" (OFF) position.
- Remove the ignition key from the ignition key cylinder.
- Open each door.
- Open the liftgate.
Q: Does scan tool MB991958 display the items "Dr door unlock", "IG voltage", "Dr door ajar switch", "As door ajar switch", "RR door ajar switch", "RL door ajar switch", "Trunk/gate trunk ajar switch" and "Handle lock switch" as normal condition?
YES
NO
NO
NO
NO
NO
NO
NO
NO
STEP 3. Check luggage compartment light connector F-02 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is luggage compartment light connector F-02 in good condition?
YES : Go to Step 4.
NO : Repair the damaged parts.
STEP 4. Luggage compartment light bulb check
Check that the luggage compartment light bulb is normal.
Q: Does luggage compartment light work normal?
YES : Go to Step 5.
NO : Replace the luggage compartment light bulb.
STEP 5. Check ETACS-ECU connector C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is ETACS-ECU connectors C-311 in good condition?
YES : Go to Step 6.
NO : Repair the damaged parts.
STEP 6. Check the wiring harness between luggage compartment light connector F-02 (terminal No. 2/1) and ETACS-ECU connector C-311 (terminal No. 3/17).
NOTE: Prior to the wiring harness inspection, check intermediate connector D-12, and repair if necessary.
Q: Is wiring harness between luggage compartment light connector F-02 (terminal No. 2/1) and ETACS-ECU connector C-311 (terminal No. 3/17) in good condition?
YES : Go to Step 7.
NO : Repair the wiring harness.
STEP 7. Retest the system
Check that the luggage compartment light illuminates/extinguishes normally.
Q: Do the luggage compartment work normal?
YES : The trouble can be an intermittent malfunction (Refer to general (Body and Chassis) How to use Troubleshooting/inspection Service Points How to Cope with Intermittent Malfunction).
NO : Replace the ETACS-ECU.