Quote:
Originally Posted by olrocker
On manual transmissions, it requires you to press both the brake pedal and clutch to start the car. Until I bought this car every manual has only required you to press the clutch - for obvious reasons and I understand them. No problem there.
My problem is requiring the brake pedal as well. So I’ve traced the clutch and brake pedal switch circuits and unfortunately they both go to the BCM, and the BCM actually controls the brake lamp illumination as well. The brake pedal does not have two switches, only one.
I’ve thought of every way to bypass the brake switch going through the BCM but still operating the brake lights properly but there isn’t.
The only way to fix this is go into the software programming and remove or turn off the BCM looking for the brake input during the starting sequence.
Anyone with extensive working knowledge of GM’s LAN system have any ideas? I hate having to press the brake AND clutch - if by chance you stall in traffic with the old way you can punch the clutch and restart without bringing the car to a complete stop. You have momentum which the guy behind you won’t notice if you do it right.
But This way someone is almost likely to rear end you!!!! Serious fail!!
GM’s engineers had a massive brain fart when they put this “safety net” into the car.
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If jamming up the brake pedal switch manually to test doesn't allow you to start the car, it most probably runs off the hydraulic brake pressure sensor. Having a treshold of minumum pressure to allow the start cycle.
The other problem is the brake light, it can run of hyd pressure or switch. If it is the switch, It would be really hard to bypass it, since you require a lot of other conditions to modify this logic.
To reverse engineer this you need to do some testing. Im sure if you're doing over 20 or 30 mph it should bypass itself.