Inspection Procedure O-11
ETACS-ECU does not receive an auto-stop signal from the rear wiper motor.Rear Wiper Auto Stop Circuit Part 1:
Rear Wiper Auto Stop Circuit Part 2:
CIRCUIT OPERATION
The ETACS-ECU makes the rear wiper stop at the predetermined park position according to the auto-stop signal from the rear wiper motor.
TECHNICAL DESCRIPTION (COMMENT)
If this signal is not normal, the rear wiper does not stop at the predetermined park position.
TROUBLESHOOTING HINTS
- Malfunction of the rear wiper motor
- Malfunction of the ETACS-ECU
- Damaged harness wires or connectors
DIAGNOSIS
Required Special Tool:
- MB991223: Test Harness Set
STEP 1. Check the rear wiper.
Q: Does the rear wiper motor operate (however, the rear wiper does not stop at the predetermined park position)?
YES: Go to Step 2.
NO: Refer to Inspection Procedure H-1 "Rear wiper does not work at all."
STEP 2. Check rear wiper motor connector F-02 for damage.
Q: Is rear wiper motor connector F-02 in good condition?
YES: Go to Step 3.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. If the rear wiper operates normally, it indicates that a correct auto-stop signal is sent from the rear wiper motor.
STEP 3. Check the rear wiper motor.
1. Disconnect rear wiper motor connector F-02.
2. While the rear wiper motor is running, disconnect the battery to stop the motor.
3. When the battery is connected as shown, the motor should run again and stop at the predetermined park position.
Q: Does the rear wiper motor operate normally?
YES: Go to Step 4.
NO: Replace the rear wiper motor. If the rear wiper operates normally, it indicates that a correct auto-stop signal is sent from the rear wiper motor.
STEP 4. Check the ignition switch (ACC) circuit to the park/neutral switch. Measure the voltage at rear wiper motor connector F-02.
1. Disconnect rear wiper motor connector F-02 and measure the voltage available at the wiring harness side of the connector.
2. Turn the ignition switch to the "ACC" position.
3. Measure the voltage between terminal 4 and ground.
The measured value should be 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 4) and the ignition switch (ACC).
NOTE: Also check intermediate connector F-05 and junction block connectors C-203 and C-209. If intermediate connector F-05 or junction block connector C-203 or C-209 is damaged, repair or replace the connector as described in Harness Connector Inspection.
Q: Is the wiring harness between rear wiper motor connector F-02 (terminal 4) and the ignition switch (ACC) in good condition?
YES: No action to be taken.
NO: Repair the wiring harness. If the rear wiper operates normally, it indicates that a correct auto-stop signal is sent from the rear wiper motor.
STEP 6. Check ETACS-ECU connector C-217 for damage.
Q: Is ETACS-ECU connector C-217 in good condition?
YES: Go to Step 7.
NO: Repair or replace the connector. Refer to Harness Connector Inspection. If the rear wiper operates normally, it indicates that a correct auto-stop signal is sent from the rear wiper motor.
STEP 7. Check the wiring harness between rear wiper motor connector F-02 (terminal 3) and ETACS-ECU connector C-217 (terminal 17).
NOTE: Also check intermediate connector F-05 and junction block connector C-209. If intermediate connector F-05 or junction block connector C-209 is damaged, repair or replace the connector as described in Harness Connector Inspection.
Q: Is the wiring harness between rear wiper motor connector F-02 (terminal 3) and ETACS-ECU connector C-217 (terminal 17) in good condition?
YES: Replace the ETACS-ECU. If the rear wiper operates normally, it indicates that a correct auto-stop signal is sent from the rear wiper motor.
NO: Repair the wiring harness. If the rear wiper operates normally, it indicates that a correct auto-stop signal is sent from the rear wiper motor.