* Power Distribution Center (PDC) or Fuse Box (Under the Hood): This is the most likely location for a relay related to the power door locks. Look for a relay that's labeled "Power Locks," "Door Locks," or something similar. The PDC often has a diagram on the inside of its cover showing relay positions and functions.
* Body Control Module (BCM): The BCM is a computer that controls many electrical functions, and it often plays a significant role in power lock operation. The BCM is usually located inside the vehicle, often under the dash or in the center console. You're less likely to find a dedicated relay here; it's more about the BCM controlling the power flow to the lock actuators.
* Door Lock Actuators: The actuators themselves are located inside each door. They are the motors that physically move the locks. While not a relay or circuit *location*, a problem here might manifest as a relay or circuit problem. Check for broken wires near the actuator connections.
* Wiring Harness: The wiring harness runs throughout the vehicle, connecting the various components mentioned above. A broken or damaged wire anywhere in this harness could interrupt power to the locks. This is often the hardest issue to diagnose.
To find the relay:
1. Consult your owner's manual: It might have a diagram of the fuse box and relay locations.
2. Look for the Power Distribution Center (PDC) under the hood: Open the hood and find the main fuse box. Its cover should have a diagram indicating the location and function of relays and fuses.
3. Check online resources: Search for "1994 Dodge Caravan power door lock relay diagram" or similar. You might find diagrams or forum posts from other owners who have tackled similar issues.
Important Note: Working with car electrical systems can be dangerous. If you are not comfortable working with automotive electricity, it is best to take your Caravan to a qualified mechanic. Incorrectly working with car wiring could damage the electrical system or even cause injury.
