Inspection Procedure H-3

Rear Wiper and Washer: When the shift lever or selector lever is moved to "R" position during the rear wiper operation, the rear wiper does not operate at the continuous mode.

"R" Position During Rear Wiper Operation Circuit:

NOTE: This troubleshooting procedure requires use of scan tool MB991958 and SWS monitor kit MB991813. For details on how to use the SWS monitor, refer to "How to use SWS monitor." How To Use SWS Monitor

CIRCUIT OPERATION
The ETACS-ECU operates the rear wiper consecutively approximately twice when the shift lever or selector lever is moved to "R" position while the rear wiper is turned on.

TECHNICAL DESCRIPTION (COMMENT)
If the rear wiper does not work consecutively approximately twice, the transmission range switch or backup light switch, the ETACS-ECU may be defective.

TROUBLESHOOTING HINTS
- The backup light switch may be defective
- The transmission range switch may be defective
- The ETACS-ECU may be defective
- The wiring harness may be damaged or the connectors may have loose, corroded or damaged terminals, pushed back in the connector

DIAGNOSIS

Required Special Tools:
- MB991223: Harness Set
- MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: Vehicle Communication Interface (V.C.I.)
- MB991827: MUT-III USB Cable
- MB991910: MUT-III Main Harness A
- MB991813: SWS Monitor Kit
- MB991806: SWS Monitor Cartridge
- MB991812: SWS Monitor Harness (For Column-ECU)
- MB991822: Probe Harness
- MB991854: SWS Monitor Harness (For 13-pin)

STEP 1. Verify the rear wiper.

Q: Does the rear wiper operate?

YES: Go to Step 2.

NO: Refer to Inspection Procedure H-1 "Rear wiper does not work at all."

STEP 2. Check the input signal by using "FUNCTION DIAG." menu of the SWS monitor.

Set each switch to the following condition before checking input signal from the backup light switch ("ON" position) or transmission range switch ("R" position) .
- Turn the ignition switch to the "ON" position.
- Turn the rear wiper switch to the ON position.
- Move the shift lever or selector lever to the "R" position.

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. Connect scan tool MB991958 to the data link connector (16-pin).
2. Connect SWS monitor harness MB991854 to the data link connector (13-pin).
3. Operate the scan tool MB991958 according to the procedure below to display "REV. INTERLOCK."
a. Select "SYSTEM SELECT."
b. Select "SWS."
c. Select "SWS MONITOR."
d. Select "FUNCTION DIAG."
e. Select "REAR WIPER."
f. Select "REV. INTERLOCK."

4. Check that normal conditions are displayed on the item described in the table.

Q: Is normal condition displayed?

YES: Replace the ETACS-ECU. When the shift lever or selector lever is moved to the "R" position, the rear wiper should operate consecutively approximately twice.

NO: Refer to Inspection Procedure N-4 "The ETACS-ECU does not receive any signal from the backup light switch." or Refer to Inspection Procedure N-4 "ETACS-ECU does not receive "R" position signal from the transmission range switch."