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 Mode.NOTE: This troubleshooting requires use of scan tool MB991958 and SWS monitor kit MB991862. For details of how to use the SWS monitor, refer to "How to use SWS monitor." How To Use SWS Monitor
"R" Position During Rear Wiper Operation Circuit:
CIRCUIT OPERATION
The ETACS-ECU operates the rear wiper consecutively approximately twice when the 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 ("R" position) or the ETACS-ECU may be defective.
TROUBLESHOOTING HINTS
- Malfunction of the transmission range switch
- 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
- MB991813: SWS monitor kit
- MB991806: SWS monitor cartridge
- MB991812: SWS monitor harness (for column-ECU)
- MB991922: Probe harness
STEP 1. Check 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 transmission range switch ("R" position).
- Ignition switch: ON
- Rear wiper switch: ON
- Shift position: 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. Connect special tool MB991911 before connecting special tool MB991812. Be sure to connect special tool MB991806 after turning on special tool MB991824.
1. Connect the special tool. Refer to "How to connect SWS monitor." How to Connect SWS Monitor
2. Operate scan tool MB991958 according to the procedure below to display "REV. INTERLOCK."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "REAR WIPER."
g. Select "REV. INTERLOCK."
3. Check that normal conditions are displayed on the items described in the given table.
Q: Are normal conditions displayed?
YES: Replace the ETACS-ECU. When the selector lever is moved to the "R" position, the rear wiper should operate consecutively approximately twice.
NO: Refer to Inspection Procedure O-4 "ETACS-ECU does not receive "R" position signal from the backup light switch