Radio turns on by itself &haeted seats shut off but work properly
After short ride wife complaining about this coming home from work and i go out to car and everthing was working fine then it hap[pened again checked all fuses and battery is a new optima just got last year might i add its been close to zero degrees these past few times this happened could it be a sensor, short, the battery?the temperature?
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Is it an aftermarket radio or original equipment, if it's an aftermarket radio the yellow wire not may not be connected properly, with a few other possible wire connection issues the yellow wire should be most common.
If its original equipment there's two fuses one underneath the hood of the car and one underneath the rear seat if both fuses are good most likely radio unit itself has crapped the bed, you can get one at the junkyard for anywhere between 25 and 75 bucks
Maybe a shorted speaker causing the power amplifier inside the radio to shut down or a speaker wire shorted to chassis and last the internal amplifier of the radio cd set faulty by itself... set volume to zero power it off take out the radio cd set; remove the speaker iso plug leaving the power plug only in and power it on if necesary turn again the volume down to zero and wait if it keeps turned on it a speaker problem if it shut itself off again then you go for a repair or a new one
Check ALL fuses. Check the wires on the back of the unit, especially ground and "key on" wire.
It may be an Intermittant shorting of the units ground wire, which would cause the unit to totally shut off and on whenever the short happens. Shouldn't be a hot power wire shorting, because it would have blown the fuse and wouldn't work at all. There is a 12v signal wire that tells the unit when your key is in the on position or the acc. position. The "key on" wire. That wire may be causing the unit to turn itself off and on if it is getting an improper signal. it may also be a problem with the cassette player itself.
May be a slight short in the switch/button. Enough that it cycles the settings or just stays on. If you want it to stay off for now, look for a fuse or relay to pull. Come to think of it, might be a bad relay. If there is one for each seat, try swapping them out and see if the problem starts on the other seat. If it follows the relay, then there's your problem.
It would be best to pull the radio fuse leaving it out for several minutes then replace it. tis may well fix the problem but if it doesn't you can remove the fuse agin knowing it will not drain the battery over night
See GM TSB 05-08-143-001, If you have Adjustable pedals, especially if they don't work with the memeory buttons, but function with thier own buttons. Its the Brake Pedal Position Sensor is shorted and mesing up the seat module which controls the heaters too. My 05 Suburban had the same issue. Can check by unplugging switch and see if heated seats work .