Inspection Procedure G-5

Windshield Washer Motor Driver Circuit:

Connectors:

CIRCUIT OPERATION
A signal from the windshield washer switch is sent through the column-ECU inside the column switch to the front-ECU. The signal turns on the relay inside the front-ECU to operate the washer motor.

TECHNICAL DESCRIPTION (COMMENT)
The washer motor, the column switch (windshield wiper and washer switch) or the front-ECU may be defective.

TROUBLESHOOTING HINTS
- Malfunction of the washer motor
- Malfunction of the column switch (windshield wiper and windshield washer switch)
- Malfunction of the front~ECU
- Damaged harness wires and connectors

DIAGNOSIS
Required Special Tools:
MB991223: Test Harness Set
MB991502: Scan Tool (MUT-II)
MB991529: Diagnostic Trouble Code Check Harness

STEP 1. Check the windshield wiper operation.
If the windshield wiper does not work normally, solve the problem first.
If the windshield wiper work normally, go to Step 2.

STEP 2. Check the input signal.
Check the input signal from the windshield washer switch.






CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

1. Turn the ignition switch to "LOCK" (OFF) position.
2. Connect scan tool MB991502 to the data link connector.
3. Check that the tone alarm of scan tool MB991502 sounds when the input signal enters.





1. Use special tool MB991529 to connect a voltmeter between ground terminal 4 or 5 and ETACS-ECU terminal 9 of the data link connector.
2. Check that the voltmeter indicator deflects once when the input signal enters.
If a defect appears, check the input signal circuit from the windshield washer switch. Refer to Inspection Procedure O-18.
If no defect appears, go to Step 3.




STEP 3. Check the washer motor.
1. Disconnect the washer motor connector A-33.
2. Fill the washer tank with water.
3. Check that the water squirts out strongly when battery positive voltage is applied to terminals 1 and 2.
If the washer motor is damaged, replace it.
The windshield washer should work normally.
If the washer motor is in good condition, go to Step 4.




STEP 4. Check the washer motor ground circuit at the washer motor connector A-33.
1. Disconnect the washer motor connector A-33 and measure at the harness side.
2. Resistance between terminal 2 and ground.
- Should be less than 2 Ohms.
If open circuit, go to Step 5.
If less than 2 Ohms. go to Step 7.




STEP 5. Check the washer motor connector A-33 for damage.
If the washer motor connector A-33 is damaged, repair or replace it. Refer to Harness Connector Inspection.
The windshield washer should work normally.
If the connector is in good condition, go to Step 6.




STEP 6. Check the harness wire between washer motor connector A-33 and ground.
If the harness wire between washer motor connector A-33 and ground is damaged, repair it.
The windshield washer should work normally.







STEP 7. Check the washer motor connector A-33 and front-ECU connector A-09X for damage.
If the washer motor connector A-33 and front-ECU connector A-09X are damaged, repair or replace them. Refer to Harness Connector Inspection.
The windshield washer should work normally.
If the connectors are in good condition, go to Step 8.










STEP 8. Check the harness wires between washer motor connector A-33 and front-ECU connector A-09X.

NOTE: After checking intermediate connector C-06, check the wires. If intermediate connector C-06 is damaged, repair or replace it. Refer to Harness Connector Inspection.

If the harness wires between washer motor connector A-33 and front-ECU connector A-09X are damaged, repair them. The windshield washer should work normally.