2002 CHEVROLET IMPALA -BATTERY WENT DEAD, REPLACED IT. NEXT DAY DOOR LOCKS LOCKING AND UNLOCKING ON THEIR OWN AND FUSE BOX CLICKING. I TESTED THE BATTERY AND ALTERNATOR AND BOTH ARE GOOD. DISCONNECTED BOTH CABLES FROM BATTERY, CLEANED REAL WELL HELD THEM TOGETHER 10/15 SECONDS. I WAS TOLD BY A LOCAL SHOP DOING THIS WOULD CLEAR AND RESET ELECTRICAL AS NEEDED.
I HOOKED BATTERY BACK UP, NO CLICKING SO STARTED CAR WHICH STARTED IMMDIATLY AND RAN FINE. I DROVE IT ABOUT 20 MINS AND IT DROVE AND RAN FINE. MADE A STOP FOR ABOUT 40 MINUTES. CAME BACK OUT AND LOW BATTERY REPLY ON RIGHT SIDE OF DASH WAS CLICKING. CAR STARTED AND RAN FINE BUT WARNING CONTINUED TO CLICK. BATTERY LAMP ON DASH NOW FLASHED WHILE DRIVING, HEADLAMPS, RADIO DISPLAY AND BACK UP LAMPS FLASHED AS LIGHT CLICKED WHILE I DROVE 20 MINUTES HOME.
I CHECKED ALL CONNECTIONS TO STARTER, ALTERNATOR AND NEGATIVE CABLE AND ALL ARE CLEAN AND TIGHT. I DISCONNECTED THE BATTERY WHEN I GOT HOME AND AM NOT SURE WHERE TO GO FROM HERE ANY ADVICE???
Sounds like you have a common problem of a bad Body Control Module(BCM). That module controls the lighting, radio and dash warnings your Chevy Impala is having a problem with. It may that when the battery went dead, is damaged the computer. Low voltage can cause havoc with modules.
A way to check that out is to remove the panel under the drivers side of the dash. The BCM is located toward the left side, near the emergency brake pedal, up against the fire wall. There are 3 plugs on it. You can either tp on it or even unplug the connectors one at a time with the key on. If things start to click or flash, then that is your problem.
There were certain BCM part numbers on the Chevy Impala and Chevy Malibu that were common to fail.
If you are going to replace it yourself, i would suggest not to do that. Your will have more headaches and spend more money.
After replacement, it would have to be programmed with you vehicle options, theft system relearned and VIN number programmed in to it. If these things are not done, the car will not start and you will end up getting it towed anyway. The dealer is the only one that can do these things with their computer scanner. Expect to pay about 1 1/2 hours labor to replace it and set it up.