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Inspection Procedure H-1

Rear Wiper and Washer: Rear wiper does not work at all.

Rear Wiper Motor Power Supply Circuit Part 1:




Rear Wiper Motor Power Supply Circuit Part 2:






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 rear wiper switch sends a signal through the column-ECU (incorporated in the column switch) to the ETACS-ECU. If the column-ECU sends a rear wiper switch "ON" signal to the ETACS-ECU, the ETACS-ECU turns on the relay (incorporated in the ETACS-ECU), thus causing the rear wiper motor to be turned on.
- The ETACS-ECU operates the rear wiper according to the following switches:
- Ignition switch (ACC)
- Rear wiper switch

TECHNICAL DESCRIPTION (COMMENT)
If the rear wiper does not work normally, the input circuit system from the switches, the rear wiper motor, the column switch (windshield wiper and windshield washer switch) or the ETACS-ECU may be defective (refer to "CIRCUIT OPERATION").

TROUBLESHOOTING HINTS
- The rear wiper motor may be defective
- The column switch may be defective (windshield wiper and washer switch)
- 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. Use scan tool MB991958 to select "ECU COMM CHK" on the SWS monitor display.

Check the following ECUs:
- ETACS-ECU
- Column-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. 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. Turn the ignition switch to the "ON" position.
4. Operate the scan tool MB991958 according to the procedure below to display "ECU COMM CHECK."
a. Select "SYSTEM SELECT."
b. Select "SWS."
c. Select "SWS MONITOR."
d. Select "ECU COMM CHK".

5. Scan tool MB991958 should show "OK" on the "ECU COMM CHK" menus for both the "COLUMN ECU", and the "ETACS ECU" menus.

Q: Is "OK" displayed on both the "ETACS ECU" and "COLUMN ECU" menus?

YES <"OK" is displayed for all the items>: Go to Step 2.

NO <"NG" is displayed on the "ETACS ECU" menu>: Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible."

NO <"NG" is displayed on the "COLUMN ECU" menu> : Refer to Inspection Procedure A-2 "Communication with the column switch (column-ECU) is not possible."

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

Check the input signals from the switches in the following conditions.
- Turn the ignition switch to the "ACC" position.
- Turn the rear wiper switch to the INT position.




1. Operate the scan tool MB991958 according to the procedure below to display "REAR WIPER."
a. Select "SYSTEM SELECT."
b. Select "SWS."
c. Select "SWS MONITOR."
d. Select "FUNCTION DIAG."
e. Select "REAR WIPER."




2. Check that normal conditions are displayed on the items described in the table.

Q: Are normal conditions displayed for "REAR WIPER SW" and "IG SW (ACC)"?

YES : Go to Step 3.

NO : Refer to Inspection Procedure N-7 "ETACS-ECU does not receive a signal from the rear wiper switch."

NO : Refer to Inspection Procedure N-1 "ETACS-ECU does not receive a signal from the ignition switch (ACC)."




STEP 3. Check rear wiper motor connector F-02 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is rear wiper motor connector F-02 in good condition?

YES: Go to Step 4.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that the windshield wiper works normally.

STEP 4. Check the battery power supply circuit to the rear wiper motor. Measure the voltage at rear wiper motor connector F-02.




1. Disconnect front-ECU and measure the voltage available at the relay box side of the connector.
2. Turn the ignition switch to the "ON" position.




3. Measure the voltage between terminal 1 and ground.
- The voltage should equal approximately 12 volts (battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery positive voltage)?

YES: Go to Step 6.

NO: Go to Step 5.

STEP 5. Check the wiring harness between rear wiper motor connector F-02 (terminal 1) and ground.






NOTE: Also check intermediate connector F-05 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If intermediate connector F-05 is damaged, repair or replace the damaged components) as described in Harness Connector Inspection.

Q: Is the wiring harness between rear wiper motor connector F-02 (terminal 1) and ground in good condition?

YES: No action is necessary and testing is complete.

NO: The wiring harness may be damaged or the connector may have loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the windshield wiper works normally.

STEP 6. Check the rear wiper motor.




1. Disconnect the rear wiper motor connector F-02.
2. Connect a battery to the wiper motor as shown in the illustration and inspect the motor operation.

Q: Is the rear wiper motor in good condition?

YES: Go to Step 7.

NO: Replace the rear wiper motor. Verify that the rear wiper works normally.




STEP 7. Check the ETACS-ECU connector C-217 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-217 in good condition?

YES: Go to Step 8.

NO: Repair or replace the damaged components). Refer to Harness Connector Inspection. Verify that the rear wiper works normally.







STEP 8. Check the harness wires between rear wiper motor connector F-02 (terminal 2) and ETACS-ECU connector C-217 (terminal 16).






NOTE: Also check intermediate connector F-05 and junction block connector C-209. If intermediate connector F-05 or junction block connector C-209 are damaged, repair or replace damaged component(s) as described in Harness Connector Inspection.

Q: Are the harness wires between rear wiper motor connector F-02 (terminal 2) and ETACS-ECU connector C-217 (terminal 16) in good condition?

YES: Replace the ETACS-ECU. Verify that the rear wiper works normally.

NO: The wiring harness may be damaged or the connectors may have loose, corroded or damaged terminals or terminals pushed back in the connector. Repair the wiring harness as necessary. Verify that the rear wiper works normally.
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