You need to trace down that noise. Sounds like a bad or stuck relay or solenoid. Once you find what it is making the noise, you will either replace it, if it is bad, or find out why it is being energized continuously. Does this vehicle have a power rear door closer?
Testimonial: "No It doesnt have a power back door.It sounds like its coming from rear of truck underneath."
SOURCE: Humming
only things ive can across with type of prob and u did one with hub some brakerotors were bad causing noise on these cars only other things is a bad wheel/tire balance, alignment also some cheap tires are extremely noisy ive always had good luck with bfgoodrich tires
SOURCE: 2001 Olds Bravada noise from rear axle when driving
you may be low on gear oil...have someone check it for you before the rear end locks up
SOURCE: security system-passlock
I hav a 1995 88 w/ same problem. Key was worn out, Had Security system disabled.by installing a resistor to by pass Sec. System.Had it done for $35.00 Check locally for a starter/alternator shop in your area.
SOURCE: 96 Bravada, tailgate and rear glass won't open
its a linkage problem . you need to remove the door panel to repair
SOURCE: Keyless Remote Problem
yes there programing to be done on the control box to the fob it requrires a locksmith or dealer
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also when the noise started it was about 230 am and the battery was dead and ignition was offaka truck was ot running,It (the noise) stayed on till like 7 am.
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