9-3 Arc/Aero (9440) L4-2.0L Turbo (2.0 T) (2004)
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3. Steering column lock
Turning the ignition OFF locks the steering column. The CIM first checks that vehicle speed does not exceed 5 km/h. The problem here is that the
TC/ABS or ESP and ECM provide the value for vehicle speed. These control modules are connected to the P-bus and there is no communication
on the P-bus when the ignition is switched OFF. To solve this problem, there is a direct lead from the TC/ABS or ESP providing a wheel speed
signal. The TC/ABS or ESP can read the wheel sensor values and transmit a speed signal since it has a separate +X feed (battery voltage with
ignition switch ON or OFF).
