I really don't like what you are doing. It just isn't natural for all the control units to get their memory wiped every day and be rebooted. All adaptations will have to be relearned. I worry about the original programming.
It is likely that you will eventually set codes in the SRS and/or ABS. All the systems have to communicate with the CAN and it is very sensitive to voltage fluctuations.
If you really want a cut-off switch I can think of other less risky methods. What happened to the key? (bg).
Bosch Master, ASE Master, L1
33 years MB technician