Step 1. ECU check by using the SWS monitor

Check that the power supply and earth lines to the column switch (column-ECU) and the front-ECU and the SWS communication lines are normal.

• Turn the ignition switch to the ON position.

ECUS TO BE CHECKED

• COLUMN ECU

• FRONT ECU

OK: "OK" is displayed for all the items

Q: Is the check result normal?

"OK" is displayed for all the items:  Go to Step 2.
"NG" is displayed on the "COLUMN ECU" menu.:  Refer to Inspection Procedure A-2 "Communication with column switch (column-ECU) is not possible ."
"NG" is displayed on the "FRONT ECU" menu.:  Refer to Inspection Procedure A-4 "Communication with front-ECU is not possible ."

Step 2. Function diagnosis by using the SWS monitor

Check the SWS communication signal, which are related to the headlamp washer function.

<Selected item> HD WASHER

• Turn the ignition switch to the ACC position.

• Headlamp washer switch: ON

Item No.	Item name	Normal condition
Item 16	HD WASHER SW	ON
Item 31	IG SW (ACC)	ON
Item 70	FRONT ECU ACK	NORMAL ACK or HI-BEAM ACK

OK: Normal conditions are displayed for all the items.

Q: Is the check result normal?

Normal conditions displayed for all the items:  Go to Step 3.
Normal condition is not displayed for item No.16:  Replace the column switch.
Normal condition is not displayed for item No.31:  Refer to Inspection Procedure P-1 "The ignition switch (ACC) signal is not received ."
Normal condition is not displayed for item No.70:  Replace the front-ECU.

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 windshield 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 to 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 power supply line from the fusible link (5) 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.