¶ BMW ATC Transfer Case
¶ BETA support in v1.0.135
¶ Supported transfer cases
All ATCxxx found in E-series E6/7/8/9x generation cars
¶ Features
- Percentual control of the amount of torque distribution between front/rear
- 16×16 map with selectable axes
- Forced RWD/AWD modes through DIN/CAN inputs
- OEM Control possibility for E6789x cars which retain stock control logic but adds RWD/AWD forcing features
- Uses stock ATC Control Unit if applicable (under passenger seat in OEM cars)
¶ E6/7/9x-specific Stuff
For stock cars, only the PTCAN-lines need to be cut from the control unit, and rerouted to CANTCU CAN1. CANTCU simulates a dummy ATC-unit via CAN3 (car integration) to the PTCAN and keeps the DSC in the car happy while fully taking over control of the transfer case.
¶ Parts Required
- ATCxxx Transfer Case
- ATCxxx Motor
- ATCxxx Control Unit (depending on model)
- Wiring between units
Models like E6x/9x have a separate ATC Control unit under the front passenger seat which controls the ATC Motor, while some E7x/8x models only have the ATC Motor with all the necessary control electronics integrated. Both types are supported by CANTCU.
¶ Connection
CANTCU CAN1 to CAN-lines on the ATC Control Unit (if applicable, connector X10594) or directly on ATC Motor (connector X8603). Pinout is the same on both.
¶ ATC Control Unit Pinout - X10594/X8603
| Pin # | Description | Connects to |
|---|---|---|
| 1 | +12V | +12V 30A fuse (2.5mm2 wire) |
| 2 | GND | GND (2.5mm2 wire) |
| 3 | WakeUp | WUP |
| 4 | - | - |
| 5 | - | - |
| 6 | PTCAN Hi | CAN1 Hi |
| 7 | PTCAN Lo | CAN1 Lo |
| 8 | +12V | +12V 5A fuse |