New To Me '03 Tahoe

['68OrangeSunshine]

Main Glitch right now is the Outside Rear View Mirror electric controls. I can set up the DS allright, but then when I slip the rocker switch right to do the PS, it goes all screwy and dumps the DS settings.
Unable to find the controlling Relay in the Owners Manual schematics.

Also Compass and Temp functions are INOP on the Center RVM. Not a pressing concern, but would be cool if working.

Some years ago, my Buddy helped me mount a Class III hitch on my '68 C/10, so I know what's entailed. Not tempted to put a ball on the present stock step bumper.