Description And Operation: Operation

Steering Column Locking 

Before sending the steering lock request to the ESL, the BCM checks the following parameters:

• Ignition status: the transition from ON or RUN to the "OFF" status.
• Driver side door status transition to driver side door open.
• The transmission must be in Park (P  ). For versions with automatic transmission only.

If one of the three conditions is not satisfied, the BCM will not send the steering column lock request to the ESL module.

If the vehicle has a manual gearbox, the BCM will only check the first two parameters (ignition status and driver door status). If they are satisfied, the ESL will lock the steering column when the vehicle speed is below a minimum threshold.

The ESL detects the vehicle speed through a Vehicle Speed Output (VSO) signal from the Anti-lock Brake System (ABS). The acquisition of the VSO signal continues even after the ignition switch is turned to "OFF".

Steering column unlocking 

When the BCM receives the information that the "Stop & Start" button has been pressed from the Radio Frequency Hub (RF-Hub), it requests that the RF-Hub carry out key recognition. If the key is identified as a "valid key", the BCM will send a steering column unlock request to the ESL. If the key is identified as an "invalid key" or "missing key", the BCM will not send a steering column unlock request.