Description

Wiper switch circuit malfunction

Detection condition

• Start stop unit detects an open circuit, short to ground, or short to power supply in the wiper switch circuit for 5 s or more with the ignition switched ON (engine off or on).

Fail-safe

Not applicable

Possible cause

• Start stop unit configuration error

• The installations of the light switch and the wiper and washer switch are reversed.

• Wiper switch malfunction

• Start stop unit malfunction

System wiring diagram

Not applicable

Step

Inspection

Action

1

• Using the M-MDS, perform the start stop unit configuration (using As-Built data).

  (See START STOP UNIT CONFIGURATION (USING AS-BUILT DATA).)

• Clear the DTC for the start stop unit using the M-MDS.

  (See CLEARING DTC [START STOP UNIT].)

• Switch the INT volume switch to each step at 5 s intervals.

• Retrieve the start stop unit DTCs using the M-MDS.

  (See DTC INSPECTION [START STOP UNIT].)

• Is the same DTC displayed?

Yes

Using the M-MDS, perform the start stop unit configuration (using As-Built data) again, then go to the next step.

(See START STOP UNIT CONFIGURATION (USING AS-BUILT DATA).)

No

Go to Step 5.

2

• Verify the installation condition of the light switch and the wiper and washer switch.

  (See LIGHT SWITCH REMOVAL/INSTALLATION.)

  (See WIPER AND WASHER SWITCH REMOVAL/INSTALLATION.)

• Are the light switch and the wiper and washer switch installed correctly?

Yes

Go to the next step.

No

Install the light switch and the wiper and washer switch properly, then go to Step 4.

(See LIGHT SWITCH REMOVAL/INSTALLATION.)

(See WIPER AND WASHER SWITCH REMOVAL/INSTALLATION.)

3

• Inspect the wiper switch.

  (See WIPER AND WASHER SWITCH INSPECTION.)

• Is the wiper switch normal?

Yes

Go to the next step.

No

Replace the wiper switch, then go to the next step.

(See WIPER AND WASHER SWITCH REMOVAL/INSTALLATION.)

4

• Clear the DTC for the start stop unit using the M-MDS.

  (See CLEARING DTC [START STOP UNIT].)

• Switch the INT volume switch to each step at 5 s intervals.

• Perform the start stop unit DTC inspection using the M-MDS.

  (See DTC INSPECTION [START STOP UNIT].)

• Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the start stop unit.

  (See START STOP UNIT REMOVAL/INSTALLATION.)

Go to the next step.

No

Go to the next step.

5

• Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [START STOP UNIT].)

No

DTC troubleshooting completed.