2003 Chevrolet Trailblazer Passenger door electrical

Did you check voltage and ground for the problem system? Did you have trouble codes checked? There are codes for those systems you listed. Some of the national brand auto stores may check codes for free.

I doubt I can diagnose this as well as a shop that can actually look at your vehicle? I did look at wiring for power windows. I haven't looked at wiring for door locks or power mirror. If all three issues are controlled by the module in that door, then I would have to check out the module, but not before checking all the basics. I wouldn't replace anything unless the diagnostics pointed in that direction.

What a shop said or did, doesn't help me.

The diagram is passenger door module, power windows. Orange wire is voltage, hot all the time. Black wire is ground, check both. The wire harness should be on hinge side of driver door.