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Inspection Procedure 3

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

CAUTION: Whenever the ECU is replaced, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.


Luggage Compartment Light Circuit:






TROUBLE JUDGMENT

The ETACS-ECU illuminates and extinguishes the luggage compartment light in accordance with the input signals from liftgate switch.

TECHNICAL DESCRIPTION (COMMENT)

If this does not work normally, the liftgate switch input circuit, luggage compartment light, or ETACS-ECU may have a problem.

TROUBLESHOOTING HINTS

- Malfunction of liftgate switch assembly
- 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 (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 too (M.U.T.-III)." How to Connect the Scan Tool (M.U.T.-III)
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 ETACS, Diagnosis. Diagnostic Trouble Code Descriptions

NO : Go to Step 2.

STEP 2. Check whether the luggage compartment light illuminates.

When the luggage compartment light switch is turned to the "DOOR" or "ON" position, check that the luggage compartment light illuminates.

Q: Does the luggage compartment light illuminate?

The light does not illuminate at the "DOOR" position. : Go to Step 3.

The light does not illuminate at the "ON" position. : Go to Step 6.

The light illuminates at neither the "DOOR" nor "ON" position. : Got to Step 8.

STEP 3. Using scan tool MB991958, check data list.

Use the ETACS-ECU service data to check the signal related to the operation of luggage compartment light.
- Open the liftgate.







Q: Does scan tool MB991958 display the item "Trunk/gate trunk ajar switch" as normal condition?

YES : (Normal condition is displayed.) Go to Step 4.

NO : (Normal condition is not displayed.) Troubleshoot the ETACS-ECU. Refer to ETACS, Diagnosis, Input signal chart. Scan Tool Testing and Procedures

STEP 4. Check luggage compartment light connector F-01 and ETACS-ECU connector C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is luggage compartment light connector F-01 or ETACS-ECU connector C-311 in good condition?

YES : Go to Step 5.

NO : Repair or replace the damaged component(s).

STEP 5. Check the wiring harness between luggage compartment light connector F-01 (terminal 1) and ETACS-ECU connector C-311 (terminal 3).

Check the output lines for open circuit and short circuit.

NOTE: Also check intermediate connector D-11 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-11 is damaged, repair or replace the connector.

Q: Is wiring harness between luggage compartment light connector F-01 (terminal 1) and ETACS-ECU connector C-311 (terminal 3) in good condition?

YES : Go to Step 11.

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.

STEP 6. Check luggage compartment light connector F-01 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is luggage compartment light connector F-01 in good condition?

YES : Go to Step 7.

NO : Repair or replace the damaged component(s).

STEP 7. Check the wiring harness between luggage compartment light connector F-01 (terminal 2) and body ground.

Check the ground lines for open circuit.

Q: Is wiring harness between luggage compartment light connector F-01 (terminal 2) and body ground in good condition?

YES : Go to Step 12.

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.

STEP 8. Luggage compartment light bulb check

Check that the luggage compartment light bulb is normal.

Q: Is luggage compartment light bulb normal?

YES : Go to Step 9.

NO : Replace the luggage compartment light bulb.

STEP 9. Check luggage compartment light connector F-01 and ETACS-ECU connector C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is luggage compartment light connector F-01 or ETACS-ECU connector C-311 in good condition?

YES : Go to Step 10.

NO : Repair or replace the damaged component(s).

STEP 10. Check the wiring harness between luggage compartment light connector F-01 (terminal 3) and ETACS-ECU connector C-311 (terminal 17).

Check the input lines for open circuit and short circuit.

NOTE: Also check intermediate connector D-11 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector D-11 is damaged, repair or replace the connector.

Q: Is wiring harness between luggage compartment light connector F-01 (terminal 3) and ETACS-ECU connector C-311 (terminal 17) in good condition?

YES : Go to Step 12.

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.

STEP 11. Retest the system

Check that the luggage compartment light illuminates and extinguishes normally.

Q: Does the luggage compartment light illuminate?

YES : The trouble can be an intermittent malfunction. (Refer to How to use Troubleshooting/inspection sevice points - How to cope with Intermittent Malfunction).

NO : Replace the ETACS-ECU.

STEP 12. Retest the system

Check that the luggage compartment light illuminates and extinguishes normally.

Q: Does the luggage compartment light illuminate?

YES : The trouble can be an intermittent malfunction. (Refer to How to use Troubleshooting/inspection sevice points - How to cope with Intermittent Malfunction).

NO : Replace the luggage compartment light.
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