Step 1. MUT-II/III diagnosis code.

When the ignition switch is turned to the LOCK (OFF) position, check that the ETACS-ECU does not set the diagnosis code.

Q: Is the diagnosis code set?

YES:  Refer to diagnosis code chart .
NO:  Go to Step 2.

Step 2. Pulse check

Check the input signals below which are related to the windshield wiper.

System switch	Check condition
Ignition switch (ACC)	When turned from the LOCK (OFF) position to the ACC position.
Headlamp washer switch	When the switch is turned from off to on.

OK: The MUT-II/III sounds or the voltmeter needle fluctuates.

Q: Is the check result normal?

All the signals are received normally:  Go to Step 3.
The ignition switch (ACC) signal is not received.:  Refer to Inspection Procedure P-1 "The ignition switch (ACC) signal is not received ."
Headlamp washer switch signal is not received.:  Refer to Inspection Procedure P-5 "The column switch (windshield wiper/washer and rear wiper/washer switch) signal is not received ."

Step 3. Connector check: A-25 headlamp washer motor connector

Q: Is the check result normal?

YES:  Go to Step 4.
NO:  Repair the connector.

Step 4. Check the headlamp washer motor assembly.

Refer to GROUP 51 - Headlamp washer .
YES:  Go to Step 5
NO:  Replace the headlamp washer motor.

Step 5. Measure the resistance at the A-25 headlamp washer motor connector.

1. Disconnect the connector, and measure at the wiring harness side.

2. Continuity between A-25 headlamp washer motor connector terminal No.2 and body earth
OK: 2Ω or less

Q: Is the check result normal?

YES:  Go to Step 7.
NO:  Go to Step 6.

Step 6. Check the wiring harness between A-25 headlamp washer motor connector terminal No.2 and body earth.

• Check the earth wires for open circuit.

Q: Is the check result normal?

YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Repair the wiring harness.

Step 7. Connector check: A-11X front-ECU connector

Q: Is the check result normal?

YES:  Go to Step 8.
NO:  Repair the connector.

Step 8. Measure the voltage at the A-11X front-ECU connector.

1. Remove the front-ECU, and measure at the junction block side.

2. Ignition switch: ACC

3. Check the voltage between the A-11X front-ECU connector terminal No.3 and body earth.
OK: System voltage

Q: Is the check result normal?

YES:  Go to Step 10.
NO:  Go to Step 9.

Step 9. Check the wiring harness between A-11X front-ECU connector terminal No.3 and the fusible link (5).

• Check the power supply line from the fusible link (5) for open circuit.

Q: Is the check result normal?

YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Repair the wiring harness.

Step 10. Check the wiring harness between A-25 headlamp washer motor connector terminal No.1 and A-11X front-ECU connector terminal No.1.

• Check the output line to headlamp washer motor for open circuit.

Q: Is the check result normal?

YES:  Go to Step 11.
NO:  Repair the wiring harness.

Step 11. Retest the system.

The headlamp washer should now work normally.

Q: Is the check result normal?

YES:  The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
NO:  Replace the front-ECU.