Step 1. Check the 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 conditions
Ignition switch (ACC)	When turned from the LOCK (OFF) position to the ACC position.
Windshield mist wiper switch	When the switch is turned from off to on.

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

Q: Are 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 ."
Windshield mist wiper switch signal is not received.:  Refer to inspection procedure P-6 "The column switch (windshield wiper washer and rear wiper washer switch) signal is not received ."

Step 3. Connector check: B-07 windshield wiper motor connector

Q: Is the check result normal?

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

Step 4. Check the windshield wiper motor assembly.

Refer to GROUP 51 - Windshield wiper.
YES:  Go to Step 5.
NO:  Replace the windshield wiper motor assembly.

Step 5. Measure the resistance at the B-07 windshield wiper motor connector.

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

2. Continuity between B-07 windshield wiper motor connector terminal No.4 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 B-07 windshield wiper motor connector terminal No.4 and body earth.

NOTE: Prior to the wiring harness inspection, check the junction connector C-17, and repair if necessary.

• 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-12X 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-12X 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-12X front-ECU connector terminal No.28 and body earth.
OK: Battery positive 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-12X front-ECU connector terminal No.28 and the ignition switch (ACC).

NOTE: Prior to the wiring harness inspection, check the junction block connectors C-202, C-203 and intermediate connectors C-116 and repair if necessary.

• Check the power supply line to the ignition switch (ACC) 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. Connector check: C-310 column switch connector

Q: Is the check result normal?

YES:  Go to Step 11.
NO:  Repair the connector.

Step 11. Check the wiring harness between C-310 column switch connector terminal No.8 and A-12X front-ECU connector terminal No.26.

NOTE: Prior to the wiring harness inspection, check the intermediate connector C-116 and repair if necessary.

• Check the wiper backup circuit.

Q: Is the check result normal?

YES:  Go to Step 12.
NO:  Repair the wiring harness.

Step 12. Retest the system.

The windshield wiper should now work normally at all.

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.