Question about 2005 Chevrolet Avalanche

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2005 avalanche Fog lights are staying on with

2005 avalanche Fog lights are staying on with vehicle shut off. Gabe Lamarre To expand on the problem. They came on overnight while the vehicle was parked. They do not respond to the swich. They turn off when the vehicle is running and the headlights are on and will not turn on with the switch as long as the headlights are on. With the vehicle running and the headlights off they are on and remain on regardless of position on the foglamp switch and remain on when the vehicle is shut off. To keep my battery from being drained I unplugged the fog light bulbs and have been using the vehicle in this manner. Any help in a solution to this problem would be greatly appreciated. Sep 25, 2013

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The fog lamps are computer controlled .the body control module (BCM) will energize the fog lamp relay control circuit. The BCM receives the park lamp ON signal from the interior park lamps supply voltage signal circuit.
DTC B2527 Front Fog Lamps Circuit Low
The body control module (BCM) monitors the front fog lamp switch signal circuit in order to determine when the fog lamp relay is to be energized. When the BCM senses that the front fog lamp switch signal circuit is grounded momentarily by pressing the fog lamp switch, the BCM energizes the fog lamp relay by grounding the fog lamp relay control circuit.

Your best bet , take it to the dealer . Could need BCM replaced , would need to do testing using the Tech 2 scan tool . A new BCM has to be programmed .

Body Control Module (BCM) Replacement
If the body control module (BCM) is replaced, the following procedures must be performed in the following order:
BCM Reprogramming--Refer to Body Control Module (BCM) Programming/RPO Configuration in Computer/Integrating Systems.
Important: This procedure has to be performed only for vehicles equipped with the Passlock™ System.
Theft Learn--Refer to Programming Theft Deterrent System Components in Theft Deterrent. A new BCM will learn the Passlock™ information automatically, but the powertrain control module (PCM) must still learn the theft information from the BCM.

Posted on Mar 29, 2017

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