Inspection Procedure F-4

INSPECTION PROCEDURE F-4: Sunroof: Safety Mechanism Does Not Function.

Safety Mechanism Function:

TECHNICAL DESCRIPTION (COMMENT)
The sunroof-ECU and motor assembly load condition according to the current, which runs in the motor. If a predetermined current is exceeded, the sunroof motor reverses due to safety mechanism. If the sunroof motor does not reverse when an excessive load is applied, the sunroof-ECU and motor assembly may be defective.

TROUBLESHOOTING HINTS
- The sunroof-ECU may be defective
- The motor assembly may be defective
- The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector

DIAGNOSIS

Required Special Tool:
- MB991223: Harness Set
- MB992006: Extra Fine Probe

STEP 1. Check sunroof-ECU connector D-03-1 and motor assembly connector D-03-2 for loose, corroded or damaged terminals, or terminals pushed back in the connector.






Q: Are sunroof-ECU connector D-03-1 and motor assembly connector D-03-2 in good condition?

YES: Go to Step 2.

NO: Repair or replace the damaged component(s). Verify that the sunroof safety mechanism works normally.

STEP 2. Check the wiring harness between sunroof-ECU connector D-03-1 (terminals 4, 10, 11 and 12) and motor assembly connector D-03-2 (terminals 3, 4, 5 and 6).

- Check the communication lines for open circuit and short circuit.






Q: Is the wiring harness between sunroof-ECU connector D-03-1 (terminals 4, 10, 11 and 12) and motor assembly connector D-03-2 (terminals 3, 4, 5 and 6) in good condition?

YES: Replace the sunroof-ECU and motor assembly. Verify that the sunroof safety mechanism works normally.

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. Verify that the sunroof safety mechanism works normally.