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With a test light check if you have power there with lights on and with lights off, compare left side with right side as far as location in the tail lamp plug for the tail lamp park lights.Trace the harness back to the left side underneath usual corrosion in this area.
Check the speakers if they work. Connect the speaker terminals using a short wire to a 1.5 volt battery (AA or any dry cell batter) and listen if there's a thumping sound when the wires are connected to the battery terminals. If there's no sound, your speakers are busted. If there's a sound, check if the wires are okay. Use the same method with the battery with the wires from the back of your stereo. Make a small cut on the wire and attach the short wires you used earlier.
Go to Helm.Com and buy yourself the factory wiring diagrams No one can answer that The professionals can't fix the easy things, so that issue ,your on your own
The front spark plugs are #s 1-3-5 from passenger side to drivers side. The rear plugs are 2-4-6 from paqssenger side to drivers side. If all the wire connections are in a row, from front to back (radiator to windshield) 1-4, 2-5, 3-6. If you have 3 on each side, it is very similar. 1-3-5 font to back on one side, 2-4-6 front to back on the other. Makes no difference which side as the plug wires are fired in pairs. Also the coils should have numbers on them to tell you where to put the wires.
Pull the drivers side door panel and find the wires going to the outer door handle lock cylinder. Cut them off and strip them back and solder or crimp connector them together.
from front to back
1-2-3 on passenger's side
4-5-6 on driver's side
the coil
1-2-3 in the rear counting from passenger's side
5-6-4 in the front counting from passenger's side
check wiring on passengers side near the rear hatch speaker, the rear door speakers are run through them also. i had the same problem and it was a unplugged connector at that location
You have to crawl in the back remove the panels and find the actuator(s), when you find them check for any linkages the may have fallen off. Gm uses little clips that get brittle and break. if it is a clip reinstall rod with a new clip or reinstal rod and secure with mechanics wire.
If the actuator is broken you can hook up a volt meter to the pin outs and test for power by hitting the door lock unlock button. If there's power then chamces are that the actuator is faulty. if theres no power check ground connections fuses relays and re test. good luck
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