Description And Operation
| 1 - ESL |
DESCRIPTION
Vehicles manufactured for Europe-Middle East-Africa (EMEA) markets only have an electromechanical device called an Electronic Steering Lock (ESL) that locks (Ignition OFF) and unlocks (Ignition ON) the steering when requested by the Body Control Module (BCM) with a valid key present in the vehicle. The ESL module is located and secured to the top of the steering column and deploys a lock bolt to lock the steering column.
The ESL module transmits data and communicates with the other modules involved in the Sentry Key Immobilizer System (SKIS) via Controller Area Network-Chassis (CAN C).
OPERATION
Steering Column Locking
Before sending the steering locking request to the ESL module, the BCM checks the following parameters:
- Ignition status: the transition from "Ignition ON" to "Ignition OFF" must be detected. The Key signal is used although the vehicle is equipped with a push button ignition system.
- For versions with automatic transmission only. Automatic transmission status: the transmission must be in Park P .
If any of the conditions are not satisfied, the BCM will not send the steering column locking request to the ESL module.
If the vehicle has a manual gearbox, the BCM will only check the first two parameters. If satisfied, the ESL module will lock the steering column when the vehicle speed is below a minimum threshold and the ignition status is OFF.
The ESL module receives the Vehicle Speed Signal (VSS) from the Antilock Brake System (ABS) module. The acquisition of the VSS continues for some time after the ignition is turned to OFF.
Steering Column Unlocking
When the BCM receives the information that the Keyless Ignition Node (KIN) 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 unlocking request to the ESL module. If instead the key is identified as an invalid key or missing key, the BCM will not send any steering column unlocking request.