I tried to hook up my '03 mirrors W/turn signals to the wifes '02 Suburban. I was unable to do so. Now the up and down on both mirrors won't work.
In and out is fine.

Checked the switch and it has continuity in every direction.

Is there a seperate relay for the in and out and another for the up and down?

I don't have a wiring diagram for either one.

Thanks in advance.

Any ideas?

If the pigtails were the same, all you have to do is go to the dealer and have the "DL3" mirrors programmed with a TechII.