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

Required Special Tools:
- MB991223: Harness Set
- MB991502: Scan Tool (MUT-II)

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 MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.




1. Connect scan tool MB991502 to the data link connector (16-pin).
2. Operate the scan tool MB991502 according to the procedure below to display "PULSE CHECK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "PULSE CHECK."
3. When each function of the sunroof switch is operated (turned on), check that scan tool MB991502 sounds.

Q: Does scan tool MB991502 sound when the sunroof switch is operated?

YES: Replace the sunroof motor assembly. The sunroof function should work now normally.

NO: Refer to Inspection Procedure N-9 "ETACS-ECU does not receive a signal from "UP", "OPEN" or "CLOSE/DOWN" switch."