Low Beams on 2007 Chevy Cobalt remain on constantly even with key removed from ignition. I must disconnect battery when I get to work. There are fuses but no relays for high or low beams. It appears BCM controls the headlights. Anybody had this problem?
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Re: Low Beams Stay On
Also, the daytime driving lights are controlled by relay. It's possible the relay may have melted down inside and is shorted, remaining on even when primary ignition power is off. The relay runs about $15.00 to $20.00 USD and might be worth a shot to replace. Likely you can get one at a recycling yard for a dollar or two.
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Sounds like you have button to one of your door locks that is stuck, you remove door lock switches and disconnect 1 at a time to see which one it is. Over time a stuck switch will drain the battery it's sending voltage to all locks constantly, there's a switch tied to ignition switch on some models that locks door when you start the engine and unlocks doors when you shut the engine off, Chev. Suburbans have that
problem in theft security system it has to be reprogrammed to new key new ignition switch key lock system. dealership fix need diagnostic eqquipment to reprogram new ignition key and ignition switch lock cylinder to the immobilizer control module and ECM.
OK remove the panel under the steering wheel becareful not to damage the trunk release wire or button you have to diconnect the wire from the button, after that is done you well see the power steering motor make sure all connector are in the large black and red are power and ground the other wire is the wire that is controled by the computer thats the one you have to make sure is in if it has a good connection then the motor is bad and has to be replaced.
There is a TSB on this issues if your having ignition lock issues.
Service Information 2009 Chevrolet Cobalt | Cobalt, G5 (VIN A) Service Manual | View All Bulletins | Document ID: 2325129 #09-02-35-005: Ignition Key Difficult to Remove, Ignition Key Binds or Sticks in Cylinder (Replace Ignition Cylinder) - (Aug 10, 2009)
Subject: Ignition Key Difficult to Remove, Ignition Key Binds or Sticks in Cylinder (Replace Ignition Cylinder)
Models: 2008-2009 Cadillac CTS (Built Prior to VIN Breakpoint 90163371)
2005-2009 Chevrolet Cobalt (Built Prior to April 14, 2009)
2006-2009 Chevrolet HHR (Built Prior to April 14, 2009)
2007-2009 Chevrolet Equinox (Built Prior to July 2008)
2005-2006 Pontiac Pursuit (Canada Only)
2006-2009 Pontiac Solstice (Built Prior to April 14, 2009)
2007-2009 Pontiac G5 (Built Prior to April 14, 2009), Torrent (Built Prior to July 2008)
Attention: This bulletin only applies to vehicle equipped with automatic transmission.
you need to disconnect your headlight switch if they go out your switch is faulty, if they stay on you will have a headlight relay fitted somewhere, look in handbook, disconnect relay if they go out relay is faulty. hope this helps.