Steering Column Lock Control Unit, Basic Function - GF80.57-P-9891A
Model all (CAR)
Shown on model 177.0
Location
The electrical steering column lock control unit is located on the steering column tube of the steering column.
Function requirements
- Electronic ignition lock control unit active
- Ignition OFF (circuit 15C)
- Wheel pulse counter = 0
Task
The electrical steering column lock control unit has the task of determining the lock status of the steering column and activating the unlocking or locking of the steering column.
The electrical steering column lock control unit processes the information from the electronic ignition lock control unit and has two supply lines, in each case from the Supplemental Restraint System control unit and from the central control unit.
The electrical steering column lock control unit performs the following functions:
- Calculation of the hash value for checking the validity of the transmitter key
- If the hash value is incorrect and the unlocking position is not reached or detected, a fault message is sent to the electronic ignition lock control unit
- Position monitoring of locking bolt via two switching contacts
- Switching on integrated motor via alternating relay for locking and unlocking locking bolt
- Arresting steering column with locking bolt
The electrical steering column lock can only move the locking bolt in the lock direction if both supply lines are active. The electronic ignition lock control unit must request that the corresponding line is switched to active.