All-Wheel Drive Control Unit, Component Description - GF28.19-P-3210AVJ
Model 253 with transmission 725.096
Shown on model 253.9
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 multi-disk clutch in the transfer case.
The drive torque to the front axle is variably regulated via this multi-disk clutch. If the multi-disk clutch is open, the entire drive torque will be delivered to the rear axle. When the multi-disk 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. Any faults in the system are indicated on the instrument cluster (A1) through corresponding messages.
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.
Chassis FlexRay (Flex E)
The all-wheel drive control unit is connected through the chassis 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) |
Chassis 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 chassis FlexRay:
| Input factors over chassis FlexRay (Flex E) | Output factors over chassis 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) | - |
| AMG suspension control unit (N3/43) | AMG suspension control unit (N3/43) | Via the powertrain control unit (N127) and the drive CAN (CAN C1) |
| Electrical power steering control unit (N68) | - | - |
| - | 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-2102-97FBA |