Inspection Procedure 5

INSPECTION PROCEDURE 5: Sunroof Safety Function does not work.

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

CIRCUIT OPERATION

Malfunction of the sunroof motor assembly or incorrect learning of the sunroof fully closed position is suspected.

TROUBLESHOOTING HINTS

- The sunroof motor assembly may be defective
- Incorrect learning of the sunroof fully closed position

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

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 tool (M.U.T.-III) Reading and Clearing Diagnostic Trouble Codes."
(2)Turn the ignition switch to the "ON" position.
(3)Check whether the sunroof motor assembly related DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Diagnose the sunroof motor assembly. Refer to Diagnostic trouble code chart Sunroof System.

NO Go to Step 2.

STEP 2. Check the trouble symptom.

Check the sunroof trouble symptom according to the following procedures:

(1)Carry out the learning procedures of the sunroof fully closed position (Refer to Programming and Relearning).

(2)Check the trouble symptom.

Q. Is the check result normal?

YES No action is necessary and testing is complete.
NO Replace the sunroof motor assembly. Check that the sunroof works normally.