Headlight turn signal not working properly?

Hi,

If the headlamp is working and the DRL, it isn't a ground problem. So, we need to check for power at the connector. By chance, does the rear left signal work?

If you look below, I attached the wiring schematic for the light assembly so that you have a reference.

With the connector disconnected at the light assembly, confirm the light blue wire has power at all times. If it does, turn the key on and the left turn signal. Check the purple wire for power.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-wiring

Let me know what you find or if you have questions.

Take care,

Joe

See pics below. Note: I highlighted the relevant wiring.

Hi,

All the readings are the same on the right side? What do you get if you check the red wire on the left side? Also, when you check things on the right side, the signal power should strobe. Is that happening?

Let me know.

Joe

I'm only seeing one red wire at the assembly. You have two?

Let me know.

Joe

Hi,

I wouldn't think that would cause it, but anything is possible. Are you able to connect the new light to the right side to see if it works? If you are getting the exact same readings on both sides, it may be the light. Are there the same number of wires on the right side?

Let me know.

Joe

Hi,

If you have the same readings on both sides but one works and one doesn't, chances are the body control module is faulty. You could check this by scanning the can-bus.

CAN stands for controller area network. Basically, the different modules are tied together via a few wires. This type of scan can retrieve codes regardless of the module storing them.

Here is a link showing how it's done:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

I have a question. You indicated the same voltage readings are present on the opposite side. When you turn the signal on (the good side), do you get that crazy jumping around of voltage? I ask because I would suspect it to jump between 0 and 12v as the light would be flashing on and off. This is one of the odd cases where an analog multimeter would be clearer.

Let me know.

Joe

Hi,

Okay. At this point, I feel we need to scan the can-bus as mentioned. I wouldn't want to recommend replacing the body control module (BCM) without confirmation something is failing.

Let me know if that is something you can do or have done.

Joe

Hi,

If he scanned the can-bus and nothing is present, I'm not sure what to say. I suspect when a load it being placed on the wiring, it is failing. However, that is a theory.

I am going to ask the site owner if he has any ideas. If you see a response from Ken, that is him. Let's see what he has to say.

Take care,

Joe

It looks like the aftermarket headlight is not good, the light blue wire goes to the fuse directly so it should have 12 volts all the time. Can you retest the light-blue wire for 12 volts please? The video is great to help us fix it. Please keep uploading. Also let's check the ground #G018 near the left side of the engine compartment. This guide can help, and I have included the headlight wiring diagrams so you can see how the system works.

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

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem so we can see what's going on.