Front passenger marker light stays on

Hello!

It sounds like the park lamp relay in the under-hood fuse block may be malfunctioning. Please check out the diagram (below). These repair guides may help you track down the fault:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://youtu.be/Hlna_kUt7As

Please let us know what you find or if you need any further assistance, and we would be happy to help.

Thanks, Wendy W

Thanks for responding!

It sounds like you're on the right track tracing out the issue.

I'm curious, if you pull the right parking light fuse, are you still getting power at the passenger side front marker lamp?

Has the vehicle been in an accident or had any other repairs recently, or is there aftermarket trailer wiring?

Thanks! Wendy W.

It seems like you've been able to narrow down the issue, somewhere between the under-hood fuse block and the light socket.

It's possible that the park lamp wiring is shorting into another circuit. Sometimes a wiring harness crosses paths with another harness and two or more circuits end up touching. If you wiggle the wiring harness in that area, does the light go out intermittently?

How do the light sockets look on that side, including for the turn signals? Are they in overall good condition?

Thanks! Wendy W.

Yes, it's possible there could be a short in the trailer wiring harness. I've attached those schematics for you (below).

Please let us know what you find.

Thanks! Wendy W.

With the key on, are the rest of the exterior lights functioning properly?

Has the vehicle set any OBD II codes that you know of?

If the circuit is cross-feeding with another circuit, you may be able to remove fuses, one at a time, to see if the light goes out. That might help narrow down which circuits are involved. I've attached detailed descriptions of the under-hood fuse block so you can see which ones involve the exterior lights.

Please let me know what you find, Wendy W.

Hello,

Thank you very much for running those tests.

There are two grounds in the exterior lighting wiring harness that you might want to check. They're circled in red on the schematic below.

Another possibility is that there is a fault in the BCM (body control module). Please see the schematic below. Notice that the courtesy light, turn signal, and parking lamps all communicate with the BCM. Please note that the negative battery cable should be disconnected before unplugging the BCM to avoid possible damage to the unit.

Here's a repair guide on what to expect when replacing a BCM:

https://www.2carpros.com/articles/how-to-replace-a-bcm-body-control-module

If you need any further information, please let me know.

Thanks! Wendy W.