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Originally Posted by Ranger  Jim, how does the brake lamp switch have anything to do with the TC warning? I'm confused. |
My conclusions only, Larry. Nothing official here; the following is the result of reverse engineering.
The way I see it after looking at the extent of integration among the various chassis control modules, GM wanted to prevent possible brake overheating
if/when there was a situation where TC was active at the same time the brake pedal switch indicated the driver was applying the brakes. A simple fail-safe choice to pass control of the total braking action to the driver.
Why a driver would apply the brakes when the drive wheels are spinning at different speeds is beyond me. But, possession of a drivers license does not require an IQ test.
The downside is adding component failures that could flag false signals including the brake arm switch, the brake lamp bulbs, and all the interconnect wiring.