COMPONENT TESTING

The following procedures assume that the technician has checked the following:

Continuity of all harness wires.
Wiper motor and wiper/washer switch connectors are mated correctly.
If the wiper motor operates but the wipers do not; check the wiper linkage and wiper motor crank arm.
Wiper motor-to-dash mounting screws tight for good ground.
Fuses are good.
Washer hoses clear, fluid in tank.
NOTE: Prior to starting the diagnosis procedure, it is very important to confirm the reported condition with a complete operational check including the washer system.

With the wiper motor installed in vehicle, disconnect the wiring harness connector.
Connect a battery to the wiper motor as shown and check the motor operation at both low and high speeds.
Run the motor low speed, disconnect the battery and stop the motor .
Reconnect the battery as shown in the illustration confirm that the motor starts operating at the low speed and it stops at the automatic stop position.

Fig. 1: Windshield wiper motor test — Montero

With the wiper motor installed in vehicle, disconnect the wiring harness connector.
Connect a battery to the wiper motor connector and check the motor operation.
Connect the battery positive (+) terminal to terminal 3 and the battery negative (-) terminal to terminal 1 and check that the motor runs at low speed.
Connect the battery positive (+) terminal to terminal 3 and the battery negative (-) terminal to terminal 2 and check that the motor runs at high speed.
Check the automatic stop operation by connecting the battery positive (+) terminal the terminal 3 and the battery negative (-) terminal to terminal 1 to run the motor at low speed. Then disconnect terminal 3 during operation to stop the motor.
Connect terminal 1 to terminal 4 and connect the battery positive (+) terminal to terminal 3 and the battery negative (-) terminal to the wiper motor bracket and check that the motor starts to run at low speed and then stops.

Fig. 2: Windshield wiper motor terminal identification — Pick-Up

With the washer motor installed in vehicle and the reservoir filled, disconnect the wiring harness connector.
Connect a battery to the wiper motor as shown and check the operation of the washer.

Fig. 3: Windshield washer motor test — Montero

Remove the column lower and upper covers.
Loosen the two retaining screws and remove the wiper and washer switch.
Operate the switch and using an ohmmeter, check for continuity between the terminals as shown

Fig. 4: Windshield wiper and washer switch continuity test — Montero

Fig. 5: Windshield wiper and washer switch continuity test — Montero

With the wiper motor installed in vehicle, disconnect the wiring harness connector.
Connect the battery positive (+) terminal to terminal 3 and the battery negative (-) terminal to ground and check the motor operation.
Connect terminal 2 to terminal 3 and connect the battery positive (+) terminal to terminal 1 and the battery negative (-) terminal to ground and check that the motor starts to run and stops at the automatic stop position.

Fig. 6: Rear wiper motor operation test — Montero

Fig. 7: Rear wiper motor stop position operation test — Montero

With the washer motor installed in vehicle and the reservoir filled, disconnect the wiring harness connector.
Connect a battery to the wiper motor as shown and check the operation of the washer.

Fig. 8: Rear washer motor test — Montero

Remove the column lower and upper covers.
Loosen the two retaining screws and remove the wiper and washer switch.
Operate the switch and using an ohmmeter, check for continuity between the terminals as shown

Fig. 9: Rear wiper and washer switch continuity test — Montero

Fig. 10: Rear wiper and washer switch continuity test — Montero