Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Front Wiper Motor: Inspection
- INSPECT WINDSHIELD WIPER MOTOR ASSEMBLY (for TMC Made)
- LO Operation Check
- Connect a positive (+) battery lead to terminal B1-5 (+1) of the connector, and a negative (-) battery lead to terminal B1-4 (E), and check that the motor operates at low speed (LO).
- HI Operation Check
- Connect a positive (+) lead to terminal B1-3 (+2) of the connector, and a negative (-) battery lead to terminal B1-4 (E), and check that the motor operates at high speed (HI).
- Automatic Stop Operation Check
- Put matchmarks on the windshield wiper motor assembly. The matchmarks will be used to confirm the return of the motor shaft to the park position.
- Connect a positive (+) battery lead to terminal B1 -5 (+1) of the connector on the wiper motor and connect a negative battery lead to terminal B1-4 (E) of the wiper motor. With the motor operating at low speed (LO), disconnect terminal B1-5 (+1) to stop the wiper motor at a position where the matchmarks do not line up.
HINT:
In the following step, connections will be made at the wiper motor to allow verification of the operation of the park contacts that are operated by the cam in the wiper motor. After the connections have been made, when the motor is not in the park position, current will flow from terminal B1-2 (B) through the park contacts in the wiper motor, to terminal B1-1 (+S). The current will then flow through the jumper wire to terminal B1-5 (+1) through the motor to ground (causing it to operate). When the motor reaches the park position, the park contacts should open, stopping the operation of the wiper motor in the correct location. Terminals B1-2 (B) and B1-1 (+S) are connected by the internal cam in the wiper motor when the wiper motor is not in the park position. Terminals B1 -1 (+S) and B1-4 (E) are connected by the internal cam in the wiper motor when the wiper motor is in the park position.
- With the ground wire still attached from the previous step, connect a jumper lead between terminal B1-1 (+S) and terminal B1-5 (+1). Next, connect a positive (+) battery lead to terminal B1-2 (B) to cause the wiper motor to operate at low speed. If the wiper motor is operating correctly, the wiper will operate until it reaches the park position. When it reaches the park position, it will automatically stop.
- Verify that the matchmarks on the windshield wiper motor assembly are lined up.
- LO Operation Check
- INSPECT WINDSHIELD WIPER MOTOR ASSEMBLY (for TMMK Made)
- LO Operation Check
- Connect a positive (+) battery lead to terminal A59-5 (+1) of the connector, and a negative (-) battery lead to terminal A59-4 (E), and check that the motor operates at low speed (LO).
- HI Operation Check
- Connect a positive (+) lead to terminal A59-3 (+2) of the connector, and a negative (-) battery lead to terminal A59-4 (E), and check that the motor operates at high speed (HI).
- Automatic Stop Operation Check
- Put matchmarks on the windshield wiper motor assembly. The matchmarks will be used to confirm the return of the motor shaft to the park position.
- Connect a positive (+) battery lead to terminal A59-5 (+1) of the connector on the wiper motor and connect a negative battery lead to terminal A59-4 (E) of the wiper motor. With the motor operating at low speed (LO), disconnect terminal A59-5 (+1) to stop the wiper motor at a position where the matchmarks do not line up.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
HINT:
In the following step, connections will be made at the wiper motor to allow verification of the operation of the park contacts that are operated by the cam in the wiper motor. After the connections have been made, when the motor is not in the park position, current will flow from terminal A59-2 (B) through the park contacts in the wiper motor, to terminal A59-1 (+S). The current will then flow through the jumper wire to terminal A59-5 (+1) through the motor to ground (causing it to operate). When the motor reaches the park position, the park contacts should open, stopping the operation of the wiper motor in the correct location. Terminals A59-2 (B) and A59-1 (+S) are connected by the internal cam in the wiper motor when the wiper motor is not in the park position. Terminals A59-1 (+S) and A59-4 (E) are connected by the internal cam in the wiper motor when the wiper motor is in the park position.
- With the ground wire still attached from the previous step, connect a jumper lead between terminal A59-1 (+S) and terminal A59-5 (+1). Next, connect a positive (+) battery lead to terminal A59-2 (B) to cause the wiper motor to operate at low speed. If the wiper motor is operating correctly, the wiper will operate until it reaches the park position. When it reaches the park position, it will automatically stop.
- Verify that the matchmarks on the windshield wiper motor assembly are lined up.
- LO Operation Check
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.