Electrical issues DDM….

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Apr 8, 2024 | 08:15 PM

#16

Cmelde01

Thread Starter

5th Wheeling

Joined: Mar 2024

Posts: 42

Likes: 1

Quote:

Originally Posted by Don Ridley

Are you still getting the "U" communication errors?

I would look for PIDs associated the the DDM. Maybe you can determine of the module is sending a signal but it's not making it to the mirror.

No I have not codes as of now. Per the workshop manual I was looking at for the 21 model, I believe the ddm only controls the led light for the telescope switch. The other wires go from the switch, to the non serviceable relay at the bjb then back to the mirror connector if I’m reading it correctly.

Apr 8, 2024 | 10:11 PM

#17

ifrythings

Fleet Mechanic

Joined: Aug 2011

Posts: 1,576

Likes: 262

Sounds like the BJB got water in it, there is a recall for that I believe, not sure if it's applicable for you or not. I don't know what else to suggest but here is 2021 wiring diagrams for your truck.