2005 suburban lights

Asked by Sep 18, 2016 at 09:52 PM about the 2005 Chevrolet Suburban 1500 Z71 4WD

Question type: Maintenance & Repair

My truck can be off then all of a sudden
lights looking like my bright lights are on.
And I can't get them to shut off. When they
come on. No keys present or anyone
around. One time it killed my battery
because I never noticed and they came on.
And you can start and restart and still can't
get them to shut off.

1 Answer

17,075

It sounds like there could be a short in the wiring that controls your automatic headlight system. When the automatic light system is selected the vehicle uses a ambient light sensor usually located on the dash to detect how much ambient light there is. If the sensor sees that it is getting dark at a certain point the light will turn on, as well as if there's enough light they will shut off. This command to turn the light on or off is controlled by the body control module. When the car is shut off and the doors are locked in some cases the lights will stay illuminated for a set amount of time until the body control module shuts off and turns the lights off. If the body control module is malfunctioning the module can stay on and eventually kill the battery. A parasitic draw test should be performed to pinpoint the cause of the unnecessary draw of power. Locate these sensors and check connections and/or replace.

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