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post #1 of 7 (permalink) Old 11-12-2015, 08:50 AM Thread Starter
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Brake Lights on Without Brake Application.

My 2009 coupes brake lights come on without the pedal being pressed, if I tap the brake pedal, the lights go out but come back on after 5-6 seconds. Seems to happen after driving the car @30 minutes or so. Suspected the brake light switch, but also considering an electronic problem. BCM?
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post #2 of 7 (permalink) Old 11-12-2015, 10:35 AM
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Brake switch needs ajusting.

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post #3 of 7 (permalink) Old 11-12-2015, 03:26 PM Thread Starter
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Looked at the switch, held in place by one bolt and a tab that goes into the brake pedal bracket-none of the holes are slotted. How does the switch adjust?
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post #4 of 7 (permalink) Old 11-12-2015, 04:27 PM
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You have to get the BCM calibrated. There's a procedure but you can't do it without a Tech2. Call your local dealer to see what they charge to calibrate the brake switch.

---------- Post added at 08:25 PM ---------- Previous post was at 08:19 PM ----------

Brake Pedal Position Sensor Calibration
Calibration Criteria
Important: Do not apply the brake pedal during the brake pedal position sensor calibration procedure. Any movement of the brake pedal during this procedure will cause the calibration procedure to fail. If this occurs, the brake pedal position sensor (BPPS) calibration must be repeated.

Brake pedal position sensor calibration must be performed after the brake pedal position sensor or body control module (BCM) have been serviced. The calibration procedure will set the brake pedal position sensor home value. This value is used by the BCM to determine the action of the driver applying the brake system and to provide this information to the vehicle subsystems via the serial data communication bus.

Calibration Procedure
Apply the parking brake.
Place the transmission in the PARK position.
Install a scan tool.
Clear all BCM DTCs before proceeding.
Navigate to the Vehicle Control Systems menu.
Select Module Setup menu item.
Select BCM menu item.
Select the BPP Sensor Calibration procedure and follow the directions displayed on the screen.

---------- Post added at 08:27 PM ---------- Previous post was at 08:25 PM ----------

Nothing is simple any more.

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post #5 of 7 (permalink) Old 11-12-2015, 04:30 PM Thread Starter
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Wow, I guess I won't be doing this in my garage. Thanks for the info!
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post #6 of 7 (permalink) Old 11-12-2015, 04:48 PM
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I believe they changed in 08 to this type of switch. Before the adjustment was done right on the pedal by simply screwing in or letting off the switch button. Life was simpler back then. Try pulling the connectors off the BCM and reconnecting in case it's a contact corrosion problem. Worth to try might save $100.

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post #7 of 7 (permalink) Old 11-13-2015, 07:04 PM
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I had the same problem with my 09 Cobalt. Look up the recalls on Malibu's. I coated the BCM with dielectric grease and it immediately solved the problem. Had been to 3 mechanics including the dealership, with no luck. I'm a single female and it was a cheap, easy fix.
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