Wiper and Washer Systems: Testing and Inspection

PARTS LOCATION





TROUBLESHOOTING
The table above will be useful for you in troubleshooting these problems. The most likely cause of the malfunction are shown in the order of their probability. Inspect each part in the order shown and replace the part when it is found to faulty.

WIPER MOTOR INSPECTION

1. INSPECT MOTOR OPERATION





Low Speed
Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead to terminal 1, check that the motor operates at low speed.
If operation is not as specified, replace the motor.





High Speed
Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1, check that the motor operates at high speed.
If operation is not as specified, replace the motor.

Stopping at Stop Position





(a) Operate the motor at low speed and stop the motor operation anywhere except at the stop position by disconnecting the positive (+) lead from terminal 3.





(b) Connect terminals 3 and 5.
(c) Connect the positive (+) lead from the battery to terminal 6 and the negative (-) lead to terminal 1, check that the motor stops running at the stop position after the motor operates again.
If operation is not as specified, replace the motor.








2. INSPECT MOTOR CIRCUIT
Disconnect the connector from the motor and inspect the connector on the wire harness side, as shown.
If the circuit is not as specified, inspect the circuit connected to other parts.

COMBINATION SWITCH INSPECTION





1. INSPECT WIPER AND WASHER SWITCH CONTINUITY





WIPER OFF





WIPER INT





WIPER LO





WIPER HI





WASHER
If continuity is not as specified, replace the switch.





2. INSPECT WIPER AND WASHER SWITCH RESISTANCE
Inspect the switch resistance between terminals.
If resistance value is not as specified, replace the switch.








3. INSPECT SWITCH CIRCUIT
Disconnect the switch and wiper relay connector, inspect each connector on the wire harness side, a shown.
If continuity is not as specified, replace the switch.

WASHER MOTOR INSPECTION




1. INSPECT MOTOR OPERATION
Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1, check that the motor operates.

NOTE: There teats must be performed quickly (within 20 seconds) to prevent the coil from burning out.

If operation is not as specified, replace the motor.








2. INSPECT MOTOR CIRCUIT
Disconnect the connector from the washer motor and inspect the connector on harness side, as shown.
If circuit is not as specified, inspect wire harness, power source or wiper switch.