Inspection Procedure F-2

Sunroof: Any of the sunroof switch positions is defective.

Sunroof Switch Circuit:

TECHNICAL DESCRIPTION (COMMENT)
The sunroof switch or the sunroof motor assembly may be defective.

TROUBLESHOOTING HINTS
- The sunroof switch may be defective
- The sunroof-ECU 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 Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991911: M.U.T.-III Main Harness B

Check the input signal (by using the Pulse check mode of the monitor).
Check the input signals from the sunroof switch.

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 the special tool. Refer to "How to connect SWS monitor."
2. Operate scan tool MB991958 according to the procedure below to display "pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."

3. When each function of the sunroof switch is operated, check that scan tool MB991958 sounds.

Q: Does scan tool MB991958 sound when the sunroof switch is operated?

YES: Replace the sunroof motor assembly (Refer to Sunroof). Verify that the sunroof should now work at all positions normally.

NO: Refer to Inspection Procedure N-9 "The ETACS-ECU does not receive any signal from the up, open or close/down switch."