2. Wipers Do Not Park

CIRCUIT OPERATION
If the windshield wiper switch is turned off, current flows from the windshield wiper motor to the FRONT-ECU, allowing the wiper motor to operate until the wipers reach the predetermined park position.

TECHNICAL DESCRIPTION (COMMENT)
Either of the following malfunctions may be present:
The windshield wiper motor may be grounded. If a malfunction appears in the communication line while the wipers are working, the fail-safe function of the FRONT-ECU retains the status before the malfunction.

TROUBLESHOOTING HINTS
The most likely causes for this case:
- Malfunction of the FRONT-ECU
- Damaged wiring harness and connector
- Malfunction of the windshield wiper motor

DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)
MB991223: Harness Set




STEP 1. Check the diagnostic trouble code.

CAUTION: To prevent damage to scan tool MB991502, make sure the ignition switch is "OFF" before connecting or disconnecting the scan tool.

Connect scan tool MB991502 to the data link connector, and then check diagnostic trouble code.
If code number 13 is displayed on scan tool MB991502, replace the FRONT-ECU. Then go to Step 6.
If no diagnostic trouble codes are displayed, go to Step 2.




STEP 2. Check the windshield wiper motor.
Check the wiper motor after disconnecting the wiring harness connector A-02, and with the wiper motor remaining installed to the body.
Wiper Motor at Stop Position Operation
1. Run the wiper motor at low-speed, disconnect the battery, and stop the motor.
2. Reconnect the battery as shown in the illustration, and confirm that after the motor starts running at low-speed, and stops at the automatic stop position.
If the windshield wiper motor is damaged, replace it. Then go to Step 3.
If the windshield wiper motor is not damaged, go to Step 3.




STEP 3. Check the power supply line at windshield wiper motor connector A-02.
1. Disconnect windshield wiper motor connector A-02 and measure at the harness side.
2. Turn the ignition key to the "ACC" position.
3. Measure the voltage between terminal (2) and ground.
- Voltage should be approximately 12 volts (battery positive voltage).
If not approximately 12 volts, go to Step 4. If approximately 12 volts, go to Step 5.




STEP 4. Check the harness wire between windshield wiper motor connector A-02 and intermediate connector C-73 (junction block side).
1. Remove the instrument panel side cover (LH)
2. Disconnect the intermediate connector C-73 from the junction block.
3. Check the harness wire between windshield wiper motor connector A-02 and intermediate connector C-73 (junction block side)




If the harness wire between windshield wiper motor connector A-02 and intermediate connector C-73 ('unction block side) is damaged, repair it.
Then go to Step 5.
If the harness wire is normal, go to Step 5.









NOTE: After checking intermediate connector C-12 or C-84, check the wire. If intermediate connector is damaged, repair or replace it.
Then go to Step 5.







STEP 5. Check the harness wire between windshield wiper motor connector A-02 and FRONT-ECU connector A-09X.
1. Remove the FRONT-ECU.
2. Check the harness wire between windshield wiper motor connector A-02 and FRONT-ECU connector A-09X.
If the harness wire between windshield wiper motor connector
A-02 and FRONT-ECU connector A-09X is damaged, repair it.
Then go to Step 6.






NOTE: After checking intermediate connector C-05, check the wire. If intermediate connector is damaged, repair or replace it.
Then go to Step 6.

STEP 6. Check symptoms.
Confirm that the intermediate connectors, the harness wires, the FRONT-ECU and the windshield wiper motor are normal.