Inspection Procedure 3

Inspection Procedure 3: The luggage compartment light does not illuminate normally.


















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

- MB991910: M.U.T.-III Main Harness A (Vehicles with CAN communication system)

STEP 1. Using scan tool MB991958, read the diagnostic trouble code.





(1)
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.

Connect scan tool MB991958. Refer to "How to connect scan too (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."
(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. Refer to Electronic Time and Alarm Control System (ETACS).

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 [Normal conditions are displayed for all items.] : Go to step 3.
NO [Normal condition is not displayed for item No. 228.] : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 4 "ETACS-ECU does not receive any signal from the front door lock actuator" Inspection Procedure 4.
NO [Normal condition is not displayed for item No. 254.] : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 2 "ETACS-ECU does not receive any signal from the ignition switch (IG1)" Inspection Procedure 2.
NO [Normal condition is not displayed for item No. 256.] : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 5 "ETACS-ECU does not receive any signal from the front door switch (LH)" Inspection Procedure 5.
NO [Normal condition is not displayed for item No. 257.] : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 6 "ETACS-ECU does not receive any signal from the front door switch (RH)" Inspection Procedure 6.
NO [Normal condition is not displayed for item No. 258.] : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 7 "ETACS-ECU does not receive any signal from the rear door switch (LH)" Inspection Procedure 7.
NO [Normal condition is not displayed for item No. 259.] : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 8 "ETACS-ECU does not receive any signal from the rear door switch (RH)" Inspection Procedure 8.
NO [Normal condition is not displayed for item No. 260.] : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 9 "ETACS-ECU does not receive any signal from the liftgate switch" Inspection Procedure 9.
NO [Normal condition is not displayed for item No. 264.] : Troubleshoot the ETACS-ECU. Refer to Inspection Procedure 3 "ETACS-ECU does not receive any signal from the key reminder switch" Inspection Procedure 3.
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 normally?

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).

Check the communication line for open or short circuit.

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. Does the luggage compartment light work normally?

YES The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
NO Replace the ETACS-ECU.