Wiring multiple lights to one switch - Cars & Trucks

Do the stop light's ,turn signals work ? Plate light's ?
Principles of Operation
The smart junction box (SJB) monitors the headlamp switch position by sending voltage reference signals on multiple circuits to the headlamp switch. At any given time, one of the signal circuits is routed to ground. If the SJB does not detect any of the inputs to the headlamp switch is active (routed to ground) for 5 seconds, the SJB turns on the exterior lights and keeps them on for 10 minutes after the ignition switch is turned off (or 10 minutes from the time the SJB does not detect any headlamp switch input if the ignition switch was already off). If the SJB detects multiple circuits short to ground, the SJB implements a planned strategy depending on the multiple inputs received. If either of these situations occur, the SJB should NOT be ruled immediately as being at fault. This is normal behavior of the SJB design as it has detected a fault with the inputs from the headlamp switch.
When the SJB receives an input from the headlamp switch indicating a request for the parking lamps, the SJB energizes the parking lamp relay (internal to the SJB), which supplies voltage to the exterior lamps.

Free wiring diagrams here http://www.bbbind.com/free-tsb

Sounds like someone has added some other lights. Fog maybe. Under carriage? You will just need to trace them. Factory wires don't have quick disconnects...

Is it possible that switch has been installed upside down?

Disconnect batery! Look under the steering column for a thick yellow wire that goes into or follows the column up to the steering wheel! This is the air bag wire! Trace this wire till you find the connection! Remove locking clip and disconnect! This will disable the air bag in the steering wheel! As for the air bag light you will have to scan the computer because there are multiple bags on a car and multiple sensors! If any of these are malfunctioning you will get a light! The light will only go out if bad part is pinpointed and replaced! Make shure you have removed the power supply and static charge from your self as I've seen these things go off when a static charge is created like draging your feet on carpet and then tuching a light switch! Actuall seen a fluorescent light bulb flicker when off from the zap at the switch! Good luck! Be carefull!!

seems you have several different problems. High beam working and no low beams=dimmer switch is bad. Reverse lamp not working=bulb socket bad,wiring broke,bad ground at back
Brake light on drivers side stuck on=brake light switch

That is a lot of work

Would it not be better to have a wiring
diagram & in 15 minutes, know where to
go, to solve the issue

I have worked on multiple door, wiring harness's on GM's. Those blasted electric window motor windows love tojamb up. Or their window switches, (momentary contact switch) will stick in the "up" or the "down" position without your knopwledge, burning up the motors. Anyway, back to your question; I have had Multiple instances where the radio fails to operate & interior lights fail, whil I have the harness unplugged waiting on parts. Mostly on family memeber GM cars. But, It has hap0pened alot. Has there bee recent damage to the LH (passenger) door or electric motor control.????

You have multiple probs. Dash lights are powered off Headlamp switch, which sounds bad. Brake lights are operated off brake light switch which is just above your brake pedal under dash. Sounds like brake light and head light switch both need to be replaced.

then the short is between the battery and switch. so take a test light and hook it on the positive battery cable and the other end to the wire going to the headlight switch (with switch disconnected) if the light is on, start pulling on the harness until it flickers and that will show where the short may be. If the light is off, then wiggle the harness until the light flickers, then find it. either way, you will find it.

All the amps should be wired directly to the battery, with a toggle switch on each of them. most amplifiers have a SWITCH wire as well, shich is usually wired to your ACC wire on the stereo. instead, run each SWITCH wire to a positive wire through the toggle switch. If done right, you should be able to run each amp on a separate circuit and can turn them on or off as you wish.