Inspection Procedure H-3
Rear Wiper and Washer: When the Selector Lever Is Moved to "R" Position During the Rear Wiper Operation, the Rear Wiper does not operate at the continuous modeTECHNICAL DESCRIPTION (COMMENT)
The ETACS-ECU operates the rear wiper consecutively twice when the selector lever is moved to "R" position while the rear wiper is turned on. If the rear wiper does not work consecutively twice, the park/neutral position switch ("R" position) may be defective.
TROUBLESHOOTING HINTS
- Malfunction of the park/neutral position switch
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors
DIAGNOSIS
Required Special Tools:
- 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 the voltmeter to check the input signal?
Scan tool MB991502 : Go to Step 2.
Voltmeter: Go to Step 3.
STEP 2. Check the input signal (by using scan tool MB991502).
Check the input signals from the park/neutral position switch "R" position.
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.
2. 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 ETACS-ECU. The rear wiper should work consecutively twice when the selector lever is moved to "R" position.
NO: Check the park/neutral position switch "R" position input signal circuit.
STEP 3. Check the Input signal (by using a voltmeter). Check the input signals from the park/neutral position switch "R" position.
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.
Q: Does the voltmeter indicator deflect?
YES: Replace the ETACS-ECU. The rear wiper should work consecutively twice when the selector lever is moved to "R" position.
NO: Check the park/neutral position switch "R" position input circuit.