If the wipers on your 1987 BMW 325is begin to malfunction, there are two possible reasons: the wiper motor or the wiper relay. Replacing either the motor or relay will fix the problem, but replacing the motor is a lot more difficult than replacing the relay. The relay is located in the engine compartment fuse panel. The motor is on the wiper assembly itself, at the bottom of the wiper arms. You can expect to spend approximately half an hour replacing both.
Tools Used: Slotted head screwdriver, Phillips head screwdriver, Socket wrench, Replacement wiper relay
Replacement wiper motor
Troubleshoot Windshield Wipers
Replacing the Wiper Motor
Pull off the left-side wiper arm assembly. Remove the grill assembly under the wiper blade by using a slotted screwdriver to release the locking tabs.
Remove the rubber strip around the fender and cowl. Uninstall the four screws securing the large plate to the firewall to reveal the wiper motor.
Pull off the electrical wire connector from the wiring harness. Remove the 10-mm center motor nut from the motor. Uninstall the three 10-mm bolts securing the motor to mounting bracket.
Install the new motor into the vehicle and secure the three 10-mm bolts as well as the 10-mm nut at the center of the motor. Reconnect the electrical wire connector.
Reinstall the four firewall screws and the rubber strip around the fender and cowl. Reassemble the left-side wiper arm assembly.
Replace the Wiper Relay
Open the hood. Lift off the cover of the fuse panel in the engine compartment by removing its three screws.
Remove the large yellow relay in the fuse panel. This is the wiper relay.
Install the replacement relay into the fuse panel, making sure it is secure.
Reattach the cover and the screws and close the hood.
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