Inspection Procedure G-5
Windshield wiper and washer: Windshield washer does not work.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 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.
Q: Does the windshield wiper work normally?
YES: Go to Step 2
NO: Solve the problem first.
STEP 2. Check the input signal (by using scan tool MB991502).
Check the input signal from the windshield washer switch.
CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
1. Connect scan tool MB991502 to the data link connector.
2. Check that the tone alarm of scan tool MB991502 sounds when the input signal enters.
Q: Does the tone alarm of scan tool MB991502 sound when the input signal enters?
YES: Go to Step 4.
NO: Check the input signal circuit from the windshield washer switch. Refer to Inspection Procedure O-16.
STEP 3. Check the input signal (by using a voltmeter).
Check the input signal from the windshield washer switch.
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.
Q: Does the voltmeter indicator deflect?
YES: Go to Step 4.
NO: Check the input signal circuit from the windshield washer switch. Refer to Inspection Procedure O-16.
STEP 4. 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.
Q: Is the washer motor in good condition?
YES: Go to Step 5.
NO: Replace it. The windshield washer should work normally.
STEP 5. 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. Measure the resistance between terminal 2 and ground.
Q: Is the resistance between terminal 2 and ground less than 2 ohm?
YES: Go to Step 8.
NO: Go to Step6.
STEP 6. Check washer motor connector A-33 for damage.
Q: Is washer motor connector A-33 in good condition?
YES: Go to Step 7.
NO: Repair or replace it. Refer to Harness Connector Inspection. The windshield washer should work normally.
STEP 7. Check the harness wire between washer motor connector A-33 and ground.
Q: Is the harness wire between washer motor connector A-33 and ground in good condition?
YES: There is no action to be taken.
NO: Repair it. The windshield washer should work normally.
STEP 8. Check washer motor connector A-33 and front-ECU connector A-09X for damage.
Q: Are washer motor connector A-33 and front-ECU connector A-09X in good condition?
YES: Go to Step 9.
NO: Repair or replace them. Refer to Harness Connector Inspection. The windshield washer should work normally.
STEP 9. Check the harness wires between washer motor connector A-33 and front-ECU connector A-09X.
NOTE: After checking intermediate connector C-05, check the wires. If intermediate connector C-05 is damaged, repair or replace it. Refer to Harness Connector Inspection.
Q: Are the harness wires between washer motor connector A-33 and front-ECU connector A-09X in good condition?
YES: There is no action to be taken.
NO: Repair them. The windshield washer should work normally.