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Old 05-15-2011, 11:32 AM   #1
nestle555
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Default 2009 Malibu Brake Light Question

Having issue with brake lights coming on periodically after brake pedal is pressed and released. Thanks for any input.
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Old 05-16-2011, 03:46 AM   #2
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Default Re: 2009 Malibu Brake Light Question

Not sure where to direct you but here are some facts you may not be aware of.

The brake lights in the 2008-2011 models do not use a conventional switch. Instead they use a position sensor kind of like a volume control. The BCM (body control module) uses that input to determine when the pedal is at rest and when it's moving, then figures out if the lights need to be turned on. The two lower brake lights that serve as turn signals are individually turned on or flashed by the BCM - there is no flasher.

Under the hood is the CHMSL relay. Its only function is to turn on the third brake light. It receives a signal from the BCM to the coil and the contacts supply the power to the light. There's a light blue wire that runs from there through the driver's door sill back to the light.

If you ride with your foot touching the brake pedal it could cause the issue you describe, but that is a rare occurrence these days. (I saw one guy in a pickup doing it Saturday.)
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Last edited by DrivenDaily; 07-11-2011 at 03:46 AM.
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Old 05-16-2011, 09:54 AM   #3
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Default Re: 2009 Malibu Brake Light Question

Dear nestle555,

How many miles do you have on your 2009 Malibu? Have you contacted your service advisor to pick their brain?

Michelle P., Chevrolet Customer Service
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Old 05-16-2011, 07:23 PM   #4
nestle555
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Default Re: 2009 Malibu Brake Light Question

Thank you, for your responses. This Malibu is my wifes car, she mentioned today that the issue with all (3) brake lights coming on within 10 seconds after the brake pedal is released, has not happened in 2 days. We have had the vehicle at several different dealerships for a rattling sound that first occured at 20,000 miles without resolution. Also, we had the transaxle seal replaced (luckly under 100,000 mile powertrain warranty) at 35,000 miles. We love the gas mileage (6 speed) the vehicle gets, but with less than 55,000 miles on the vehicle and already experienced this many issues, not very impressed with the long term quality of this vehicle.
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Old 05-17-2011, 09:26 AM   #5
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Default Re: 2009 Malibu Brake Light Question

nestle555,

I would like to look into your situation in further detail. However, in order to do this I will some additional information from you. Please, check your private messages. Through a private message I will let you know that type of information that I will need.

Thank you,
Michelle, Chevrolet Customer Service
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Old 07-10-2011, 04:19 PM   #6
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Smile Re: 2009 Malibu Brake Light Question

Nestle555,
Found some info on the web that older Malibus had a problem with a relay not making a good conection. Since I was having this problem too I figured what could it hurt to try this fix. I removed the relay(#49 I think) located next to the battery under the hood and reinserted it several times and also applied a little dielectric grease. So far so good, the problem hasn't recurred in the last three days. Try it, you won't do any damage and if it doesn't work you'll only be out $2.99 for a tube of grease.
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Old 07-10-2011, 08:19 PM   #7
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Default Re: 2009 Malibu Brake Light Question

Quote:
Originally Posted by Metalman View Post
Nestle555,
Found some info on the web that older Malibus had a problem with a relay not making a good conection. Since I was having this problem too I figured what could it hurt to try this fix. I removed the relay(#49 I think) located next to the battery under the hood and reinserted it several times and also applied a little dielectric grease. So far so good, the problem hasn't recurred in the last three days. Try it, you won't do any damage and if it doesn't work you'll only be out $2.99 for a tube of grease.
New relays are not much more than that. Also, there are at least seven of those 8666 relays that are identical & interchangeable. Good way to test one is to swap it with another.
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Old 07-16-2011, 08:38 AM   #8
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Default Re: 2009 Malibu Brake Light Question

I am also having this problem. When this happens the "Service Traction" and "service esc" is on the console. The trasction control triangle light is on the console. The car is in park and the brake lights are on. When the peddle is pressed the brake lights blink. When the peddle pressure is lifted the lights go off for about 2 seconds then come back on. Sounds like TSB 08-05-22-009 but 2009 Malibu is not listed in the TSB applications. I go to the dealer Monday. I will reply here after that.

Last edited by l024308; 07-16-2011 at 08:41 AM.
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Old 07-16-2011, 03:36 PM   #9
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Default Re: 2009 Malibu Brake Light Question

l024308 your problem sounds similar to what happened to me. Post
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Old 07-19-2011, 06:31 AM   #10
tbern
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Default Re: 2009 Malibu Brake Light Question

I'm having the same issue with the brake light intermittently coming on. I had the pedal position sensor replaced but this is still an issue. Is cleaning & lubing the BCM the answer?
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