All-Wheel Drive Control Unit, Component Description - GF28.19-P-3211AVM
Model 217, 222 with transmission 725.096
Shown on vehicle with transfer case
Location
The all-wheel drive control unit is attached to the lower part of the transfer case.
Task
The all-wheel drive control unit actuates the all-wheel drive actuator (N45/1) integrated into the all-wheel drive control unit in order to enable variable drive torque distribution. The all-wheel drive actuator then controls the multidisk clutch in the transfer case.
The drive torque to the front axle is variably regulated via this multidisk clutch. If the multidisk clutch is open, the entire drive torque will be delivered to the rear axle. When the multidisk clutch is closed, up to 50 % of the drive torque will be applied to the front axle. Control here is performed automatically and cannot be influenced by the driver.
Messages in the instrument cluster (A1)
If case of faults in the system, messages to this effect will be displayed in the instrument cluster.
Control module programming
The all-wheel drive control unit is programmable, i.e. the complete software of the control unit can be exchanged (replaced). It is also possible to exchange the data separately. The software required for control unit programming is stored on the diagnosis software DVD.
Suspension FlexRay (Flex E)
The all-wheel drive control unit is connected through the suspension FlexRay to the vehicle's network group and exchanges data with the other control units.
| Input factors over a direct line | Initial parameters over a direct line | Supplemental information |
|---|---|---|
| Circuit 31 | - | - |
| Circuit 30 | - | - |
| Terminal 15 | - | - |
| Transmission oil temperature sensor signal (B91) | - | - |
| - | All-wheel drive actuator (N45/1) | Integrated in the all-wheel drive control unit (N45) |
Suspension FlexRay input/output signals
Input and output factors for the following control units are sent or received by the all-wheel drive control unit via the suspension FlexRay:
| Input factors over suspension FlexRay (Flex E) | Output factors over suspension FlexRay (Flex E) | Supplemental information |
|---|---|---|
| Electronic Stability Program control unit (N30/4) | Electronic Stability Program control unit (N30/4) | - |
| Powertrain control unit (N127) | Powertrain control unit (N127) | - |
| Electronic ignition lock control unit (N73) | Electronic ignition lock control unit (N73) | - |
| Electrical power steering control unit (N68) | - | - |
| Drive Unit control unit (N145/1) | Drive Unit control unit (N145/1) | - |
| - | Instrument cluster (A1) | Over the electronic ignition lock control unit (N73) and user interface CAN (CAN HMI) |
| - | ME-SFI control unit (N3/10) | Via the powertrain control unit (N127) and the drive CAN (CAN C1) |
| - | Fully integrated transmission control unit (Y3/8n4) | Via the powertrain control unit (N127) and the drive CAN (CAN C1) |
| Wiring diagram for all-wheel drive control unit | PE28.19-P-2102-97SEA |