1) Check for any interference from aftermarket electronic components such as two-way radios or lights.
Turn OFF or remove any aftermarket electronic components to ensure that there is no influence on inspections or operations.
1) Inspect the wiper switch.
Refer to "9.Body, Cab, Accessories 9A.Lighting Systems combination switch inspection".
If a malfunction is found in the wiper switch, replace it.
Refer to "9.Body, Cab, Accessories 9A.Lighting Systems combination switch removal".
Refer to "9.Body, Cab, Accessories 9A.Lighting Systems combination switch installation".
2) Inspect the wiper relay.
If a malfunction is found in the wiper relay, replace it.
3) Check the wiper motor.
Refer to "9.Body, Cab, Accessories 9B.Wiper, Washer Systems wiper motor inspection".
If a malfunction is found in the wiper motor, replace it.
Refer to "9.Body, Cab, Accessories 9B.Wiper, Washer Systems wiper motor removal".
Refer to "9.Body, Cab, Accessories 9B.Wiper, Washer Systems wiper motor installation".
4) Inspect the BCM.
Observe the DTC information, and replace the BCM if a malfunction is found.
Caution
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control BCM removal".
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control BCM installation".
Refer to "9.Body, Cab, Accessories 9Z.Body, Cab, Accessories Electrical Control BCM setting".
1) Check that the ground point is normal.
Repair or clean any ground points that are improperly installed or significantly dirty.
Caution
Refer to "201.General Information 14A.Service Information Guide Preliminary and post procedures".