Step 1. ECU check on the SWS monitor

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

• Ignition switch: ACC

ECUS TO BE CHECKED

• COLUMN ECU

• ETACS 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 2.
"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 "ETACS ECU" menu.:  Refer to Inspection Procedure A-3 "Communication with the ETACS-ECU is not possible ."

Step 2. Function diagnosis by using the SWS monitor

Check the SWS communication signal, which are related to the rear wiper function.

<Selected item> REAR WIPER

• Ignition switch: ACC

• Rear wiper switch: ON

Item No.	Item name	Normal conditions
Item 13	REAR WIPER SW	ON
Item 31	IG SW (ACC)	ON

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 3.
Normal condition is not displayed for item No. 13:  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 ."

Step 3. Connector check: F-02 rear wiper motor connector

Q: Is the check result normal?

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

Step 4. Check the rear wiper motor.

Refer to GROUP 51 - Rear wiper and washer .
YES:  Go to Step 5.
NO:  Replace the rear wiper motor.

Step 5. Measure the resistance at the F-02 rear wiper motor connector.

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

2. Resistance between F-02 rear wiper motor connector terminal No. 1 and body earth
OK: 2 Ω 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 F-02 rear wiper motor connector terminal No. 1 and body earth.

NOTE: Prior to the wiring harness inspection, check intermediate connector F-05, and repair if necessary.

• Check the earth line for open or short 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: C-217 ETACS-ECU connector

Q: Is the check result normal?

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

Step 8. Check the wiring harness between C-217 ETACS-ECU connector terminal No. 16 and F-02 rear wiper motor connector terminal No. 2.

NOTE: Prior to the wiring harness inspection, check intermediate connector F-05 and junction block connector C-221, and repair if necessary.

• Check the power supply line for open or short circuit.

Q: 1Is the check result normal?

YES:  Go to Step 9.
NO:  Repair the wiring harness.

Step 9. Retest the system.

Check that the rear wiper works 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 ETACS-ECU.