CAUTIONCOMMENTS ON TROUBLE SYMPTOM
The windshield wiper motor, the column switch or the front-ECU may be defective. If a
problem is found in the ECU check by using the SWS monitor, also check the wiper backup circuit (between
C-310 column switch connector terminal No.8 and A-12X front-ECU connector terminal No.26) and
repair if necessary.POSSIBLE CAUSES
- Malfunction of the windshield wiper motor
- Malfunction of the column switch
- Malfunction of the front-ECU
- Damaged harness wires and connectors
DIAGNOSIS PROCEDURE
Step 1. ECU check on the SWS monitor
- Turn the ignition switch to the ON 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 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 "FRONT ECU" menu.: Refer to Inspection Procedure A-4 "Communication with the front-ECU is not possible
."Step 2. Function diagnosis by using the SWS monitor
<Selected item>
F.WIPER INT
- Turn the ignition switch to the ACC position.
- Windshield wiper switch: INT
| Item No. |
Item name |
Normal conditions |
|---|---|---|
| Item 05 |
INT WIPER SW |
ON |
| Item 31 |
IGNITION 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.05: 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 5. Measure the resistance at the B-07 windshield wiper motor
connector.
- Disconnect the connector, and measure at the wiring harness side.
- 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 joint 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. Measure the voltage at the A-12X front-ECU connector.
- Remove the front-ECU, and measure at the junction block side.
- Ignition switch: ACC
- 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 9.NO: Go to Step 8
.Step 8. Check the wiring harness between A-12X front-ECU connector
terminal No.28 and ignition switch (ACC).
NOTE: Prior to the wiring harness inspection, check the junction block connectors C-202, C-203
and intermediate connector C-116 and repair if necessary.
- Check the power supply line to 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.