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Unlocking the Steering
The following procedure is necessary to unlock the steering:
1. Detection of a valid remote control/ID transmitter
2. Enable (release) of the unlock function
3. Unlocking the steering
4. Feedback
5. Switching off ELV module
Valid Remote Control
On vehicles equipped with the CAS2, the remote control must be inserted in its holder in
order to check whether the remote control is valid for this vehicle.
Note: On vehicles equipped with the Comfort Access system, the ID transmitter
must be located in the vehicle interior in order to check whether the ID
transmitter is valid for this vehicle.
Enable (release) of the Unlock Function
The power supply for the ELV is switched on after successfully checking the electronic
vehicle immobilizer and receiving start authorization. Based on the status of the Hall sen-
sor, the ELV module checks whether the steering is locked or unlocked. The status is
sent via the CAS/K-bus to the CAS2.
The enable signal is issued after evaluating the following input signals:
• Vehicle speed signal
• Terminal status
• Hall sensor ELV.
Unlocking the Steering
The ELV module starts the unlocking procedure and briefly activates the motor three
times to move the lock pin in the unlock direction. The safety lever locks mechanically
into the unlocked position to secure the unlocked steering column.
The steering is now unlocked and successful completion of the unlock procedure is
detected by the status of the Hall sensor.
The steering wheel must be turned back and forth if this is not the case. The motor is
again driven three times.
A Hall sensor registers the end position of the secured lock pin. The ELV module evalu-
ates the Hall sensor and stops motor operation.
106
E90 General Vehicle Electrical
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