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2005 Chevy Tahoe, Brake Lights Come On w/Headlights


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bigjontn 
Member - Posts: 3
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Joined: July 17, 2012
Location: Tennessee, United States
Posted: July 17, 2012 at 3:08 PM / IP Logged  
My brake lights come on and stay on when the headlights are on. Was told that the bcm controls this. Dealer wants more money than I have to replace. A new one will have to be programmed by the dealer so I'm told. Does anyone have any information that might be helpful.
Thanks
BigJon
i am an idiot 
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Joined: September 21, 2006
Location: Louisiana, United States
Posted: July 17, 2012 at 3:30 PM / IP Logged  
Do you have separate plugs for the brake and tail lamps? What are the chances somebody got them mixed up?
bigjontn 
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Joined: July 17, 2012
Location: Tennessee, United States
Posted: July 17, 2012 at 4:11 PM / IP Logged  
I wish it was that simple. During the day when I press the brakes my park lights come on/off with brake lights.
i am an idiot 
Platinum - Posts: 13,598
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Joined: September 21, 2006
Location: Louisiana, United States
Posted: July 17, 2012 at 4:14 PM / IP Logged  
Sounds like a bad ground on the brake lamp harness.
bigjontn 
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Location: Tennessee, United States
Posted: July 17, 2012 at 4:33 PM / IP Logged  
I'll try secondary ground for tail/brake lights
howie ll 
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Posted: July 18, 2012 at 12:09 AM / IP Logged  
X2 with Mr. I.
oldspark 
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Posted: July 18, 2012 at 1:37 AM / IP Logged  
x3 with Mr I.
Usually however a bad ground results in a dimmer light - ie, it is the tail-light filament that glows, not the brake (assuming brake-tail common grounding). [Traditionally, your front parkers should also glow when the brake (light) is applied.]
But if extra switching is used (relays or transistors etc), then full brightness is possible.

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