How do you find the windshield wiper relay if there is one on a 1992 Chevy Lumina?

The 1992 Chevy Lumina doesn't typically have a dedicated windshield wiper relay in the same way some cars do with a single easily identifiable component. Instead, the wiper motor control is often integrated into the Body Control Module (BCM) or a similar integrated control unit. This is a common design for that era.

Therefore, you won't find a standalone relay labeled "windshield wipers." Troubleshooting should focus on:

1. Fuses: Check the fuse box (usually under the hood and/or inside the car, often under the dash) for any blown fuses related to the wipers. Your owner's manual will show you the fuse diagram and which fuse(s) control the wipers.

2. BCM/Control Module: The problem is *likely* within the BCM itself. This module is complex and requires professional diagnosis if you suspect it's the culprit. Testing its output to the wiper motor requires specialized equipment and knowledge of the vehicle's wiring diagram.

3. Wiper Motor: Test the wiper motor directly (with care!) to confirm it's not the source of the issue. This requires disconnecting the motor and applying power carefully – incorrect polarity can damage it. Again, this step is best left to someone with experience working with automotive electrical systems.

4. Wiring: Check the wiring harness for any broken, frayed, or corroded wires leading to the wiper motor and the switch.

In short: Don't expect to find a separate windshield wiper relay. Troubleshooting needs to focus on the fuses, the BCM, the wiper motor, and the wiring between them. If you're not comfortable working with automotive electrical systems, taking it to a mechanic is strongly recommended. Trying to diagnose a BCM issue without the proper tools and knowledge can be dangerous and may lead to further damage.