Inspection Procedure F-2

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

TROUBLESHOOTING HINTS
- Malfunction of the sunroof switch
- Malfunction of the sunroof motor assembly
- Damaged harness wires or connectors

DIAGNOSIS
Required Special Tools:
MB991223: Test Harness Set
MB991502: Scan Tool (MUT-II)
MB991529: Diagnostic Trouble Code Check Harness

Check the input signal.
Check the input signals from the sunroof switch.






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

1. Connect scan tool MB991502 to the data link connector.
2. Check that the tone alarm of scan tool MB991502 sounds when the input signal enters.





1. Use special tool MB991529 to connect a voltmeter between ground terminal 4 or 5 and ETACS-ECU terminal 9 of the data link connector.
2. Check that the voltmeter indicator deflects once when the input signal enters.
If a defect appears, check the sunroof switch input circuit. Refer to Inspection Procedure O-20.
If no defect appears, replace the sunroof motor assembly. The sunroof should work normally in all of the switch positions.