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Many newer vehicles have separate fuses/relays for separate lighting systems on their vehicles. Check your owners manual for the location of the fuse/ relay panel that controls your tail or rear lights. Presuming your bulbs are not blown, more than likely you will find a bad fuse or relay. Most fuses and relays can be purchased at auto parts retailers and some retailers can show you exactly where they are located in your specific vehicle. If the fuse, relays and bulbs are all good, but the lights still don't work...you probably have a corroded or bad connector in the wiring harness leading to the rear of the vehicle. The later senario is very rare except in instances where the vehicle has had major colision repairs. Good Luck.
If a GM chassis and problem is dash air, remove the power wire from blower (under hood) & apply 12 volts directly in order to confirm blower even works. Next, pull blower relay harness & check for arcing/burnt wires & contacts (usually the culprit this year GM). If good, trace wire to relay and check for 12 volts at relay (be sure to use a test light) and do this across the ground and power wires to relay and, relay to blower. Bad grounds and burnt contacts on relays are more of a problem than fuses during these years.
check all the fuses and replace any that are blown. also check beattery wires and make sure the positive wires are not touching anything metal.look for burnt marks or black spots on the wires too. also have the battery fuse/relay checked.
Have your compressor check. Squeaking sound is caused by a metal to metal contact. Your compressor bearing needs to be replace, to get it aligned. So that the metal to metal contact will be eliminated. Reload your compressor with refrigerant, before getting it activated. Replace the burnt wiring and the relay. Since a lot of work must be done, it is suggested that you take this to the car aircon service center.
Did you check or replace the brake light bulbs? It is more common to have burnt bulbs than a bad brake light switch or blown fuse. Do you have orange signal lights and red brake lights at the rear? Then the signal light switch will not affect the brake lights.....but.... If they are all red and you use the same bulbs for brake and signal....the brake light wiring goes through the signal light switch and could be affected there. First....check for power getting to the brake light switch......and leaving it with a test light.......then go to the rear....pull a light assembly and check for power getting to the bulbs.no power? follow the wiring back to the switch looking for a bad connection. The fuses and relays under the hood are usually in a black plastic box labeled fuses and or relays.
check for power at compressor clutch if power and earth there is ok new compressor required. no power there check relay and fuses swap air cond relay with another one that looks the same in under bonnet fuse and relay box