What changes
Central electrics 09 long coding, byte 37, bit 1 = 1 (auto_activation). The parking system switches itself on when the car approaches an obstacle ahead at low speed.
Details
Requires front parking sensors. Many cars have it on from the factory — a3c then shows there is nothing to write. To turn off, set the same bit to 0. A long coding parameter of the MLB Evo central electrics unit (J519). One bit changes, the other bytes stay. 09 coding on MLB Evo usually needs no access code; from model year 2019 the unit may accept changes only with the bonnet open. If the unit is SFD-protected, a3c warns before writing.