Component Tests and General Diagnostics

Windshield Wiper Motor

CAUTION:
^ The magnets in the windshield wiper washer motor can become damaged if the motor is jarred.
^ The ammeter must have a range of at least 10 amps DC in order not to be damaged.

NOTE: Use an external 12 V DC supply which can he loaded to at least 10 amps, or use fused battery voltage. Measure the power drained by the front wiper motor.







1. Switch off the ignition.
2. Remove the windshield wiper motor.
3. Remove the component multiplug.

CAUTION: Mount the windshield wiper motor firmly, so that the wiper linkage can move freely.

4. Connect the negative terminal of the ammeter to pin 1 of the windshield wiper motor.
5. Connect the voltage supply negative to pin 3 of the windshield wiper motor.
6. Connect the voltage supply positive to the positive terminal of the ammeter and switch on the voltage supply. Read the current on the meter as the windshield wiper motor runs at high speed. The reading should be about 3 amps.
7. Switch off the voltage supply and disconnect the negative terminal of the ammeter from the windshield wiper washer motor.
8. Connect the negative terminal of the ammeter to pin 2 of the windshield wiper motor and switch on the voltage supply. Read the current on the meter as the windshield wiper motor runs slowly. The reading should be about 2 amps.
9. Switch off the voltage supply.

Check the limit switch.







Requirement: The windscreen wiper motor must not be at the rest position. Connect the voltage supply positive to pin 2, the voltage supply negative to pin 5 of the front windshield wiper motor. Using test cables, connect pin 3 with pin 4 on the windshield wiper motor. Switch on the voltage supply. The windshield wiper motor must run at slow speed and stop in the rest position.

If it does, continue with the next test step; if not, INSTALL a new windshield wiper motor.







Measure the resistance between pin 5 and 3 of the windshield wiper motor.

If the resistance is less than 1 ohm the motor is OK. If not, INSTALL a new windshield wiper motor.

Rear Wiper Motor

CAUTION:
^ The magnets in the windscreen washer motor can become damaged if the motor is jarred.
^ The ammeter must have a range of at least 10 amps DC in order not to damage the meter.

NOTE: Use an external 12 V DC supply which can be loaded to at least 10 amps, or use fused battery voltage.

Measure the power drained by the rear wiper motor.







1. Switch off the ignition.
2. Remove the component multiplug.
3. Connect the negative terminal of the ammeter to pin 2 of the rear wiper motor. Connect the voltage supply negative to the rear wiper motor housing.
4. Connect the voltage supply positive to the positive terminal of the ammeter and switch on the voltage supply. Read the current on the meter as the rear wiper motor runs. The reading should be about 2 amps.
5. Switch off the voltage supply and remove all test connections.

Check limit switch.







Requirement: The rear wiper motor must not be at the rest position.

Connect the voltage supply negative to the rear wiper motor housing. Connect the voltage supply positive to pin 1 of the rear wiper motor and switch on the voltage supply. The motor must run and stop in the rest position. If it does, the motor is OK. If not, INSTALL a new rear wiper motor.

Front/rear wiper relay







1. Check break contact.
Measure the resistance between pin 3 and 4.
Is the resistance less than 1 ohm?
If yes, GO to step 2.
If no, INSTALL a new relay.







2. Check make contact.
Measure the resistance between pin 3 and pin 5.
Is the resistance greater than 10 kohm?
If yes, GO to step 3.
If no, INSTALL a new relay.







3. Check relay contact in activated condition.
Connect the positive terminal of the power supply with pin 1.
Connect the negative terminal of the power supply with pin 2.
Measure the resistance between pin 3 and pin 5.
Does the relay switch audibly and is the resistance less than 1 ohm?
If yes, the relay is OK.
If no, INSTALL a new relay.

Multifunction Switch, Part 1:

Multifunction Switch, Part 2:

Multifunction Switch, Part 3:

Multifunction switch