I have a mess...Started with GM stuck in park and no brake lights, no flashers,no turn signals, no AC lights out on dash...I replaced the stop brake switch on brake pedal and nothing changed. To get it out of park i turned ignition 1/4 turn, put in neutral, started and drove to Firestone for oil change and diagnostic....Mechanic said he was a able to get it out of park...drove in shop and changed oil and parked outside. Called me and said car is ready and came in/out of gear so I thought all was good. Still had electrical issues...Drove home..
Again, no brake lights, no turn signal, no AC power, no flashers...I checked all fuses. Someone said change the LCM. I bought remanufactured LCM remove the old and plugged in the new...No changes. Just in case the new brake switch is faulty I replaced it again...nothing. Does anyone have a suggestion?