Inspection Procedure H-2

Rear Wiper and Washer: Rear Wiper does not Stop at the Predetermined Park Position.

Rear Wiper Auto Stop Circuit:

TECHNICAL DESCRIPTION (COMMENT)
If the rear wiper does not stop at predetermined park position, the rear wiper motor or the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the rear wiper motor
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicles communication interface
- MB991827: MUT-III USB cable
- MB991911: MUT-III Main harness B

Check the input signal (by using the Pulse check mode of the monitor).
Check the automatic stop signal, which the rear wiper motor sends to the ETACS-ECU.

NOTE: When the rear wiper is operated, a signal is sent to the ETACS-ECU.

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. 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."

2. Check that scan tool MB991958 sounds.

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

YES: Replace the ETACS-ECU. The rear wiper should stop automatically at the predetermined park position.

NO: Refer to Inspection Procedure P-7 "ETACS-ECU does not receive an auto-stop signal from the wiper motor."