Chevy Impala Lights Clicking And Flashing After Battery Replaced

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.


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7 comments to Chevy Impala Lights Clicking And Flashing After Battery Replaced

  • Kevin

    I unplugged each BCM plug one at a time but got no relay clicking or dash lamps.
    When you said one at a time this means unplug one,then plug it back in and then go to the next plug correct??? I should not have disconnected all 3 together correct? I also removed the right front seat, unplugged the theft module on the floor and checked all connections but saw nothing abnormal nor at the BCM plugs no corrosion was apparent. I also unplugged the power trunk plug at the lock and put it back.After I did all this the car started,ran fine so drove it 15mins, all was ok. Came home today locks and relays were clicking and Battery was drained.I consulted my local Chevy dealer who said it is the Bcm what do you think???

    Thanks,
    Kevin

    • Admin

      Yes, that is the way to disconnect them. The module under the passenger seat is not the theft module, it is the airbag module. Why did you think that? It could have been a very bad day if you clunked or tapped on it. It could have set off the airbags ! Yes, if the lights are flashing with the car off, then i do think it is the BCM.

    • Anonymous

      I found a great way to test the BCM on an 04′ Impala. Had clicking relays, headlights flashing etc. Body Control Module is over your lft knee when sitting in the drivers seat. Under the dash and in a pocket up next to the firewall. Unplug all three plugs, take it out of the pocket and put in in your deep freezer for an hour and take it quickly out to your car and plug it quickly back in and all will work as new. As it warms back up it will start to foul up again but you have verified that this is the problem. The circuit bird inside will crack leading to malfunctions. The freezing temporary adjoins the circuits until it warms back up. This sounds stupid but it works. I then ordered the BCM off Amaxon for $129. Dealer wanted $300. I put it in in the dealers parking lot so the dealer could program the new BCM for $102. All worked fine and car was sold to a friend and all is still well.

  • Anonymous

    Ok Thannks so much for your help

  • imparla man

    Lights flicking, security light on, relay clicking, dash going dead, but car starting and running normal. What the hell is going on.

  • Anonymous

    Sounds like a problem with the voltage regulator on the alternator

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