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Brake Pedal over CanBus
Posted: Thu Mar 06, 2025 7:10 am
by medo
Hi, just a quick question, can we receive the brake pedal signal via canbus without laying a new cable to the zombie converter, would have 2 advantages, less cable to reduce the complexity, and would also activate the brake light when regenerating, I think for BMW E6x the canid would be 0x0A8
Re: Brake Pedal over CanBus
Posted: Thu Mar 06, 2025 10:50 am
by tom91
The BMS E6x and E9x have brake over CAN.
At this moment this is not a good idea due to how the CAN reading is done by the Zombie.
No the BMW is NOT setup to turn on brake lights via CAN info from the engine ECU which the Zombie Emulates.
So the short answer is NO & NO.
Re: Brake Pedal over CanBus
Posted: Thu Mar 06, 2025 2:16 pm
by jetpax
tom91 wrote: ↑Thu Mar 06, 2025 10:50 am
The BMS E6x and E9x have brake over CAN.
At this moment this is not a good idea due to how the CAN reading is done by the Zombie.
Why is that?
Re: Brake Pedal over CanBus
Posted: Thu Mar 06, 2025 2:19 pm
by tom91
No timeouts or additional plausibility checks carried out.
There would have to be done per device, per variable read and determined through a failure mode analysis what a "correct" response is.
This is something that you cannot just "force" the variable to zero upon a message time out or error.