INSPECTION PROCEDURE F-2: Sunroof: Any of the sunroof switch positions is defective.: Diagnosis
Required Special Tools:
- MB991223: Test Harness Set
- MB991502: Scan Tool (MUT-II)
- MB991529: Diagnostic Trouble Code Check Harness
- STEP 1. Check method of the input signal.
Q: Which is to be used, the scan tool or a voltmeter to check the input signal?
Scan tool MB991502 : Go to Step 2.
Voltmeter : Go to Step 3.
- STEP 2. Check the input signal (using the scan tool MB991502).
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.- Connect scan tool MB991502 to the data link connector.
- Check that the tone alarm of scan tool MB991502 sounds when the input signal enters.
Q: Does the tone alarm of scan tool MB991502 sound when the input signal enters?
YES : Replace the sunroof motor assembly. The sunroof should work normally in all of the switch positions.
NO: Scan tool MB991502 does not sound when the sunroof switch is turned from "OFF" to "OPEN/TILT UP" or "CLOSE/TILT DOWN": Refer to INSPECTION PROCEDURE O-18 "THE OPEN/TILT UP OR CLOSE/TILT DOWN SWITCH SIGNAL IS NOT SENT TO THE ETACS-ECU ."
- STEP 3. Check the input signal (by using a voltmeter).
Check the input signals from the sunroof switch.
- Use special tool MB991529 to connect a voltmeter between ground terminal 4 or 5 and ETACS-ECU terminal 9 of the data link connector.
- Check that the voltmeter indicator deflects once when the input signal enters.
Q: Does the voltmeter indicator deflect?
YES : Replace the sunroof motor assembly. The sunroof should work normally in all of the switch positions.
NO: Scan tool MB991502 does not sound when the sunroof switch is turned from "OFF" to "OPEN/TILT UP" or "CLOSE/TILT DOWN": Refer to INSPECTION PROCEDURE O-18 "THE OPEN/TILT UP OR CLOSE/TILT DOWN SWITCH SIGNAL IS NOT SENT TO THE ETACS-ECU ."