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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:






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 or connectors may have loose, corroded, or damaged terminals, or 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
- MB991911: MUT-III Main Harness B
- MB991862: SWS monitor kit

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. Connect the DLC harness before connecting the column-ECU harness. Be sure to connect SWS monitor kit MB991862 after turning on scan tool MB991958.







1. Connect scan tool MB991958 to the data link connector.
2. Connect SWS monitor kit MB991862 to the column switch connector.
3. Turn the ignition switch to the "ON" position.
4. Operate scan tool MB991958 according to the procedure below to display "ECU COMM CHK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."

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

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

"OK" are displayed for all the items : Go to Step 2.

"NG" is displayed on the "ETACS ECU" menu : Refer to Inspection Procedure A-3 "Communication with ETACS-ECU is not possible."

"NG" is displayed on the "COLUMN ECU" menu : Refer to Inspection Procedure A-2 "Communication with 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 following switches:
- ignition switch: ACC
- rear wiper switch: INT







Operate scan tool MB991958 according to the procedure below to display "REAR WIPER."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "FUNCTION DIAG."
5. Select "REAR WIPER."




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

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

Normal conditions are displayed for all the items : Go to Step 3.

Normal condition is not displayed "REAR WIPER SW" : Refer to Inspection Procedure N-6 "ETACS-ECU does not receive a signal from the rear wiper switch."

Normal condition is not displayed for "IG SW (ACC)" : 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-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is rear wiper motor connector F-05 in good condition?

YES: Go to Step 4.

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

STEP 4. Check the rear wiper motor.




1. Disconnect rear wiper motor connector F-05.
2. Connect the battery to the rear wiper motor, and check the rear wiper motor.

Q: Does the rear wiper motor operate normally?

YES: Go to Step 5.

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

STEP 5. Check the ground circuit to the rear wiper motor. Test at rear wiper motor connector F-05.




1. Disconnect rear wiper motor connector F-05 and measure the resistance available at the wiring harness side of the connector.




2. Measure the resistance value between terminal 1 and ground.
- The resistance should equal 2 Ohms or less.

Q: Is the measured resistance 2 Ohms or less?

YES: Go to Step 7.

NO: Go to Step 6.




STEP 6. Check the wiring harness between rear wiper motor connector F-05 (terminal 1) and ground.

Q: Is the wiring harness between rear wiper motor connector F-05 (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(s) 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.




STEP 7. Check C-226 for loose, corroded or damaged terminals, or terminals pushed back in the connector.

Q: Is ETACS-ECU connector C-226 in good condition?

YES: Go to Step 8.

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










STEP 8. Check the wiring harness between rear wiper motor connector F-05 (terminal 2) and ETACS-ECU connector C-226 (terminal 16).

NOTE: Also check junction block connector C-217 for loose, corroded, or damaged terminals, or terminals pushed back in the connector. If junction block connector C-217 is damaged, repair or replace the damaged component(s) as described in Harness Connector Inspection.

Q: Is the wiring harness between rear wiper motor connector F-05 (terminal 2) and ETACS-ECU connector C-226 (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 connector(s) 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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