Step 1. Check the operation of the windshield wipers.

Check that the windshield wipers work normally.

Q: Is the check result normal?

YES:  Go to Step 2.
NO:  Refer to Inspection Procedure G-1 "The windshield wipers do not work at all."

Step 2. ECU check on 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 ACC position.

ECUS TO BE CHECKED

• COLUMN ECU

• FRONT ECU

OK: "OK" are displayed for all the items

Q: Are the check result normal?

"OK" are displayed for all the items:  Go to Step 3.
"NG" is displayed on the "COLUMN ECU" menu.:  Refer to Inspection Procedure A-2 "Communication with the column switch (column-ECU) is not possible ."
"NG" is displayed on the "FRONT ECU" menu.:  Refer to Inspection Procedure A-4 "Communication with the front-ECU is not possible ."

Step 3. Function diagnosis by using the SWS monitor

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

<Selected item> F.WIPER WASH

• Turn the ignition switch to the ACC position.

• Windshield washer switch: ON

Item No.	Item name	Normal conditions
Item 09	FRONT WASH. 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: Are the check result normal?

Normal conditions displayed for all the items:  Go to Step 4.
Normal condition is not displayed for item No.09:  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 4. Connector check: A-26 windshield washer motor connector

Q: Is the check result normal?

YES:  Go to Step 5.
NO:  Repair the connector.

Step 5. Check the windshield washer motor assembly.

Refer to GROUP 51 - Windshield washer .
YES:  Go to Step 6.
NO:  Replace the windshield washer motor.

Step 6. Measure the resistance at the A-26 windshield washer motor connector.

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

2. Continuity between A-26 windshield washer motor connector terminal No.1 and body earth
OK: 2Ω or less

Q: Is the check result normal?

YES:  Go to Step 8.
NO:  Go to Step 7.

Step 7. Check the wiring harness between A-26 windshield washer motor connector terminal No.1 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 8. Connector check: A-12X front-ECU connector

Q: Is the check result normal?

YES:  Go to Step 9.
NO:  Repair the connector.

Step 9. Check the wiring harness between A-26 windshield washer motor connector terminal No.2 and A-12X front-ECU connector terminal No.31.

• Check the power supply line to the ignition switch (ACC) for open circuit.

Q: Is the check result normal?

YES:  Go to Step 10.
NO:  Repair the wiring harness.

Step 10. Retest the system.

The windshield 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.