Hi, Welcome.
No need to connect anything directly to the BCM, it's hardest.
What you need:
Supply
- A wire 0.5 mm from T16/1 (16-pin connector, slot 1) of new parking control unit to Fuse SC13b 5Amp
+15 (wire green/black).
- T16/8 ground (brown)
CAN line new parking control unit
- Low---- from T16/15 (orange/brown) to CAN Low in any other control unit of powertrain.
- High---- from T16/6 (orange/black) to CAN High in any other control unit of powertrain.
Some control units powertrain: Instrument cluster, Additional instruments, Headlight range control unit, Steering column electronics control unit, Power steering control unit, BCM, Engine, ABS... Choose the one you prefer to make an easy installation.
Parking aid button
The rest are the sensors and buzzers connected to the control unit J446. T12 connector/s