Steering Column Lock Module (SCL)

Fig 1: Identifying Steering Column Lock Module (SCL)

Courtesy of VOLVO CARS CORPORATION

NOTE: The steering column lock module (SCL) is only available on model year 2004-08 for the USA/CDN market and model year 2004- for other markets.

Steering column lock module (SCL) (4/102) checks the function of the steering wheel lock. The control module is installed the underside of the steering column inside the passenger compartment. Steering column lock module (SCL) is connected serially to Central electronic module (CEM) for communication and directly connected to Central electronic module (CEM) for voltage feed. Steering column lock module (SCL) is only supplied with voltage when locking or unlocking.

Central electronic module (CEM) sends out commands to Steering column lock module (SCL) when locking and unlocking is to take place. Communication between Steering column lock module (SCL) and Central electronic module (CEM) is encrypted. For Steering column lock module (SCL) to function in the vehicle it must be loaded with codes for the immobilizer function. This takes place when downloading software.

The steering column lock module (SCL) consists of:

an electric motor
a spring bolt
a communication circuit
a switch.

The steering column lock module (SCL) locks the steering wheel using the spring bolt. The spring bolt is moved back and forth by the electrical motor. The position of the spring bolt is indicated by the contact breaker in the steering column lock. The steering column lock module (SCL) transmits information at regular intervals about the position of the spring bolt to the central electronic module (CEM). A diagnostic trouble code (DTC) is stored in the central electronic module (CEM) if the spring bolt cannot reach its unlocked position or its position cannot be determined. A message will also be shown in the display on the driver information module (DIM).

HINT: If the steering wheel is loaded when trying to unlock the steering column lock, the motor for the lock may be unable to unlock it (too much pressure on the spring bolt). An error message will be shown in the display on the driver information module (DIM) if this is the case. If this should happen, move the steering wheel slightly to reduce the pressure on the spring bolt, before a new start attempt.

The steering column lock module (SCL) is powered by the central electronic module (CEM) and grounded in the body.

For more information on steering column lock, see STEERING COLUMN LOCK