However, there's no guarantee it'll be a dedicated relay. Some GM vehicles of that era integrated the power door lock function into a larger relay or module. Therefore, you may find it's controlled by a:
* Body control module (BCM): This is a more sophisticated approach and would require diagnostic tools to pinpoint the issue, not simply replacing a relay.
* A relay within the underhood fuse box that shares functions: Look for relays related to body control, power accessories, or even the central locking system. The relay might not be specifically labeled "power door locks."
To find it:
1. Locate the underhood fuse box: This is usually a large black plastic box under the hood, often near the battery.
2. Consult your owner's manual: The owner's manual should have a diagram of the fuse box showing relay locations and functions. Even if it doesn't specifically label a "power door lock relay," it will show the layout, potentially allowing you to infer where such a relay might be based on its likely related circuits.
3. Examine the relays: Look for relays that are similar in size and appearance to other power-related relays (they're typically square or rectangular with multiple terminals). If you have a multimeter, you could attempt to trace the circuit related to the power door locks to identify the correct relay.
Important Note: Before attempting any work on your vehicle's electrical system, disconnect the negative terminal of your battery.
If you can't find the relay after checking the fuse box and consulting the manual, a professional mechanic or auto electrician will have the diagnostic tools and expertise to properly diagnose the problem. It is much more likely the problem lies within the BCM than a simple relay failure.
