Rear
REAR WIPER AND WASHER DIAGNOSISTROUBLESHOOTING STRATEGY
Gather the information from the customer.
1. Verify that the condition described by the customer exists.
2. Find the malfunction by the following Symptom Chart.
3. Verify the malfunction is eliminated.
TROUBLE SYMPTOM CHART
Trouble Symptom Chart:
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Rear wiper does not work at all.
Rear Wiper Motor Circuit (Part 1):
Rear Wiper Motor 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.
TROUBLESHOOTING HINTS
- The rear wiper motor may be defective
- The column switch (windshield wiper and washer 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
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles communication interface (V.C.I.)
- MB991827: M.U.T.-III USB cable
- MB991911: M.U.T.-III Main harness B
STEP 1. Use the scan tool MB991958 to check if an ETACS-related diagnostic trouble code is set.
Connect the scan tool. Refer to Chassis Electrical ETACS, "Diagnostic function".
Q: Is the diagnostic trouble code set?
YES : Diagnose the ETACS-ECU. Refer to Chassis Electrical ETACS, "Diagnostic trouble code chart".
NO : Go to Step 2.
STEP 2. Check the input signal related to the rear wiper operation.
- Ignition switch: ACC
OK: Normal condition is displayed.
Q: Is the check result normal?
NO : Go to Step 3.
YES : Refer to Chassis Electrical - ETACS, Input signal procedures.
STEP 3. Check the rear wiper motor connector F-32 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is rear wiper motor connector F-32 in good condition?
YES : Go to Step 4.
NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection. Verify that the rear wiper works normally.
STEP 4. Check the rear wiper motor.
1. Disconnect rear wiper motor connector F-32.
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 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. Measure the resistance at the rear wiper motor connector F-32.
1. Disconnect rear wiper motor connector F-32 and measure the resistance available at the wiring harness side of the connector.
2. Measure the resistance value between terminal 3 and ground.
- The resistance should be 2 W or less.
Q: Is the measured resistance 2 W or less?
YES : Go to Step 7.
NO : Go to Step 6.
STEP 6. Check the wiring harness between rear wiper motor connector F-32 (terminal 3) and ground.
Q: Is the wiring harness between rear wiper motor connector F-32 (terminal 3) 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 ETACS-ECU connector C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is ETACS-ECU connector C-311 in good condition?
YES : Go to Step 8.
NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection. Verify that the rear wiper works normally.
STEP 8. Check the wiring harness between rear wiper motor connector F-32 (terminal 1) and ETACS-ECU connector C-311 (terminal 5).
NOTE: Also check junction block connector D-15, F-31 for loose, corroded or damaged terminals, or terminals pushed back in the connector. Repair or replace the damaged component(s) as described in General (Electrical), Harness Connector Inspection.
Q: Is the wiring harness between rear wiper motor connector F-32 (terminal 1) and ETACS-ECU connector C-311 (terminal 5) 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.
INSPECTION PROCEDURE 2: Rear wiper does not stop at the specified park position.
Rear Wiper Motor Circuit (Part 1):
Rear Wiper Motor Circuit (Part 2):
TECHNICAL DESCRIPTION (COMMENT)
If the rear wipers do not stop at predetermined park position, the rear wiper motor or the ETACS-ECU may be defective.
TROUBLESHOOTING HINTS
- The rear wiper motor may be defective
- 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
- MB992006: Extra Fine Probe
STEP1. Check rear wiper motor connector F-32 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is rear wiper motor connector F-32 in good condition?
YES : Go to Step 2.
NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection. Verify that the windshield wiper works normally.
STEP 2. Check the rear wiper motor.
1. Disconnect rear wiper motor connector F-32.
2. Connect the vehicle battery to the rear wiper motor connector as shown, and operate the rear wiper. While the rear wiper is working, disconnect the battery at positions other than the specified park position to stop the rear wiper motor.
3. When the battery is connected as shown, the motor should run and then stop at the specified park position.
Q: Does the rear wiper motor operate normally?
YES : Go to Step 3.
NO : Replace the rear wiper motor. The rear wiper should now stop at the specified park position.
STEP 3. Check rear wiper motor connector F-32 and ETACS-ECU connector C-311 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is rear wiper motor connector F-32 and ETACS-ECU connector C-311 in good condition?
YES : Go to Step 4.
NO : Repair or replace the damaged component(s). Refer to General (Electrical), Harness Connector Inspection.
STEP 4. Check the wiring harness between rear wiper motor connector F-32 (terminals 2,4) and ETACS-ECU connector C-311 (terminals 8, 4).
NOTE: Also check intermediate connector D-15 ,F-31 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is the wiring harness between rear wiper motor connector F-32 (terminals 2,4) and ETACS-ECU connector C-311 (terminals 8, 4) in good condition?
YES : Go to Step 5.
NO : Repair or replace the damaged component(s). Refer to General (Electrical), Cables and wire check.
STEP 5. Check the input signal related to the rear wiper operation.
- Ignition switch: ACC or ON
- Rear wiper: In operation
NOTE: Confirm that the scan tool displays ON to OFF when rear wiper stops at the specified park position.
OK: Normal condition is displayed.
Q: Is the check result normal?
YES : Intermittent malfunction. Refer to General (Body and Chassis), How to cope with intermittent malfunction.
NO : Replace the ETACS-ECU.
INSPECTION PROCEDURE 3: When the 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 Wiper Operation Circuit:
"R" Position During Wiper Operation Circuit [M/T]:
"R" Position During Wiper Operation Circuit [TC-SST] (Part 1):
"R" Position During Wiper Operation Circuit [TC-SST] (Part 2):
CIRCUIT OPERATION
The ETACS-ECU operates the rear wiper consecutively 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, the transmission range switch ("R" position) or the ETACS-ECU may be defective.
TROUBLESHOOTING HINTS
- The back-up light 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
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles communication interface (V.C.I.)
- MB991827: M.U.T.-III USB cable
- MB991911: M.U.T.-III Main harness B
STEP 1. Verify the rear wiper.
Check that the rear wiper system works normally by operating the rear wiper switch.
Q: Does the rear wiper operate?
YES [CVT, A/T] : Go to Step 2.
YES [M/T, TC-SST] : Go to Step 4.
NO [Rear wiper does not work.] : Refer to Inspection Procedure 1 "Rear wiper does not work at all".
STEP 2. Use the scan tool MB991958 to diagnose the CAN bus lines.
Connect the scan tool. Refer to Chassis Electrical ETACS, "Diagnostic function".
Q: Is the check result normal?
YES : Go to Step 3.
NO : Repair the CAN bus line (Refer to Controller Area Network - CAN Bus Diagnosis Chart).
STEP 3. Use the scan tool MB991958 to diagnose other system diagnostic trouble code
Check that the CVT-ECU sets a diagnostic trouble code.
Q: Is the diagnostic trouble code set?
YES : Diagnose the CVT-ECU (Refer to CVT - Diagnostic Trouble Code Chart).
NO : Go to Step 10.
STEP 4. Connector check: B-110 Back-up light switch [M/T] or C-49 shift lever [TC-SST] connector
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the damaged connector.
STEP 5. Back-up light switch [M/T] or shift lever [TC-SST] check
Check that the back-up light switch [M/T] (Refer to M/T - Overhaul - Transaxle Inspection) or shift lever [TC-SST] (Refer to Twin Clutch-Sportronic Shift Transmission (TC-SST) - Shift lever operation check) operates normally.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Replace the back-up light switch.
STEP 6. Voltage measurement at the B-110 back-up light switch [M/T] or C-49 shift lever [TC-SST] connector
1. Disconnect the connector, and measure at the wiring harness-side connector.
2. Turn the ignition switch to the ON position.
3. Measure the voltage between the B-110 back-up light switch [M/T] connector terminal No. 2 or C-49 shift lever [TC-SST] connector terminal No. 4 and body ground.
OK: Battery positive voltage
Q: Is the check result normal?
YES : Go to Step 8.
NO : Go to Step 7.
STEP 7. Check the wiring harness between B-110 back-up light switch [M/T] connector terminal No. 2 or C-49 shift lever [TC-SST] connector terminal No. 4 and the ignition switch (IG1).
NOTE: Prior to the wiring harness inspection, check intermediate connector A-10, intermediate connector C-39, and joint connector C-38, and junction block connector C-313 and C-317, and repair if necessary.
- Check the power supply line for open circuit.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Repair the wiring harness.
STEP 8. Check ETACS-ECU connector C-304 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Is ETACS-ECU connector C-304 in good condition?
YES : Go to Step 9.
NO : Repair the damaged connector.
STEP 9. Check the wiring harness between B-110 back-up light switch [M/T] connector terminal No. 1 or C- 49 shift lever [TC-SST] connector terminal No. 3 and C-304 ETACS-ECU connector terminal No. 2.
NOTE: Prior to the wiring harness inspection, check intermediate connector A-10, and repair if necessary.
- Check the output lines for open circuit and short circuit.
Q: Is the check result normal?
YES : Go to Step 10.
NO : Repair the wiring harness.
STEP 10. Retest the system.
Check that the rear wiper operates continuously when the selector lever is moved to the R position during the rear wiper operation.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to General (Body and Chassis) - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction).
NO : Replace the ETACS-ECU.
INSPECTION PROCEDURE 4: Rear washer does not work normally.
CIRCUIT OPERATION
The rear washer switch sends a signal through the column-ECU (incorporated in the column switch) to the ETACS-ECU. If the column-ECU sends a rear washer switch "ON" signal to the ETACS-ECU, the ETACS-ECU turns on the relay (incorporated in the ETACS-ECU), thus causing the windshield and rear washer motor to be turned on.
TECHNICAL DESCRIPTION (COMMENT)
If the rear washer does not work normally, the windshield and rear washer motor, the column switch (windshield wiper and washer switch) or the ETACS-ECU may be defective.
TROUBLESHOOTING HINTS
- The windshield and rear washer motor may be defective
- The column switch (windshield wiper, washer switch) may be defective
- The ETACS-ECU may be defective
DIAGNOSIS
Required Special Tools:
- MB991223: Harness Set
- MB992006: Extra Fine Probe
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: Vehicles communication interface (V.C.I.)
- MB991827: M.U.T.-III USB cable
- MB991911: M.U.T.-III Main harness B
STEP 1. Verify the windshield washers.
Q: Does the windshield washers operate?
YES : Go to Step 2.
NO : Refer to Inspection Procedure 10 "Windshield washer does not work".
STEP 2. Verify the rear wiper.
Q: Does the rear wiper operate?
YES : Go to Step 3.
NO : Refer to Inspection Procedure 1 "Rear wiper does not work".
STEP 3. Use the scan tool MB991958 to check if an ETACS-related diagnostic trouble code is set.
Connect the scan tool. Refer to Chassis Electrical ETACS, "Diagnostic function".
Q: Is the diagnostic trouble code set?
YES : Diagnose the ETACS-ECU. Refer to Chassis Electrical ETACS, "Diagnostic trouble code chart".
NO : Go to Step 4.
STEP 4. Check the input signal related to the rear washer operation.
- Ignition switch: ACC
- Rear washer switch: ON
OK: Normal condition is displayed.
Q: Is the check result normal?
NO : Go to Step 5.
YES : Refer to Chassis Electrical - ETACS, Input signal procedures.
STEP 5. Check the washer motor.
1. Disconnect the washer motor connector A-54.
2. Fill the windshield washer tank with washer fluid.
3. When battery voltage is applied between terminals 1 and 2, washer fluid should spray out.
Q: Does the washer motor operate normally?
YES : Go to Step 6.
NO : Replace the washer motor. Verify that the rear washer works normally.
STEP 6. Replace the ETACS-ECU, and then check its operation.
Replace the ETACS-ECU, and then check that the rear washer works normally.
1. Replace the ETACS-ECU.
2. Ignition switch: ON
3. The rear washer should now work normally.
Q: Is the check result satisfactory?
YES : Intermittent malfunction. Refer to General (Body and Chassis), How to cope with intermittent malfunction.
NO : Replace the front-ECU.