First, I attached the exterior lighting schematic for you so that you would have a reference.
I went through the schematic and want to note a couple of things. First, both the left and right-side lamp assemblies have different grounding points, so unless they both failed at the same time, I don't suspect that is the issue.
Next, both the front and rear parking lamps get power from the same relay, so if the front works, it isn't a power issue from the relay.
That takes me to the body control module or damaged wiring. I have to ask, does anything in the rear work? For example, do the license plate lights work or the center high mount stop light work (CHMSL)?
If I'm reading the schematics correctly, the turn signal function is provided by the body control module (BCM) and the parking lamps get power from the parking lamp relay (rear fuse box). However, the BCM is required to actuate the relay to send power to the lighting, so, this is a confusing one.
At this point, I am not 100% sure what is happening. Let me know if anything is working on the rear and if this all happened at one time. If it did, my first suspect is the BCM because it is odd that all the different power supplies to the rear and different grounding locations would have failed at the same time unless somehow all supply wires to the rear broke at the same time.
Let me know.
See pics below. Note: Ignore the highlighted wires. I did that to see if power was coming from the same place for the front and rear lamps.
Images (Click to make bigger)
Monday, September 18th, 2023 AT 6:51 PM