Inspection Procedure 6

INSPECTION PROCEDURE 6: Sunroof Timer Lock Function does not Work Normally.

CAUTION:
Before replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.

CIRCUIT OPERATION

- The sunroof timer function works according to the signals from the following switches:
- Ignition switch (IG1): OFF

- Front door switch (LH): OFF

- Front door switch (RH): OFF

- Vehicle condition
- Ignition switch: LOCK (OFF) position

- Front door (LH): Closed

- Front door (RH): Closed

- When the driver's door or the passenger's door are opened and closed while the sunroof timer function is on, the sunroof operative duration will be changed.

TECHNICAL DESCRIPTION (COMMENT)

If the sunroof timer function does not work normally, the input circuits from the switches described in "CIRCUIT OPERATION", the sunroof motor assembly, the ETACS-ECU or the LIN communication line may be defective.

TROUBLESHOOTING HINTS

- The front door switch may be defective

- The sunroof motor assembly may be defective

- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

PROBABLE CAUSES

- Malfunction of the driver's door switch

- Malfunction of the sunroof motor assembly

- Malfunction of ETACS-ECU

- Damaged wiring harness and connectors

DIAGNOSTIC PROCEDURE

Required Special Tools:

- MB992006: Extra fine probe

- MB991223: Harness set

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles 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. Check the power supply system.

With the ignition switch in the LOCK (OFF) position, check if the following function operates normally:

- Hazard warning light

- Central door locking system

Q. Is the check result normal?

YES Go to Step 2.
NO Electronic Time and Alarm Control System (ETACS)-ECU Removal and Installation?.
STEP 2. 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. 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. Electronic Time and Alarm Control System (ETACS)?.

NO Go to Step 3.

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

Check the signals related to the sunroof timer function operation.





(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. Reading and Clearing Diagnostic Trouble Codes."
(2)Turn the ignition switch to the "ON" position.
(3)Check the data list of the ETACS.

- Turn the ignition switch to the LOCK (OFF) position.

- Close the driver's door.

- Close the passenger's door.





(4)Turn the ignition switch to the "LOCK" (OFF) position.
OK: Normal condition is displayed.

Q. Is the check result normal?

Normal conditions are displayed for all the items. : Go to Step 4.

Normal condition is not displayed for item No. 254. : Inspection Procedure 2.

Normal condition is not displayed for item No. 256. : Inspection Procedure 5.

Normal condition is not displayed for item No. 257. : Inspection Procedure 6.

STEP 4. Retest the system.

Check that the sunroof timer function works normally.

Q. Is the check result normal?

YES No action is necessary and testing is complete.
NO Replace the ETACS-ECU. Check that the sunroof timer function works normally.