Power Adjustable Steering Column

The power adjustable steering column is mounted directly to and monitored by the SCCM. When the switch is pressed to move the column a direction, the SCCM sends a message to the DSM. The DSM provides the power and ground to the steering column tilt and telescoping motors to control the movement of the steering column.

Memory Column Operation 

The memory SET switch is monitored by the DDM. When a memory position is recalled using the memory SET switch, the DDM sends a message to the DSM. The DSM activates the tilt/telescope motors to adjust the steering column to the position that is stored in the DSM memory. Once the steering column reaches the desired position, the DSM deactivates the steering column motors. If the DSM receives a steering column switch input during a memory position recall function, the module stops the memory recall and responds to the new steering column switch position input.

The DSM monitors the steering column position using Hall-effect sensors that are integral to the tilt and telescope motors. The sensors provide a signal used by the DSM to calculate the position of the steering column. The DSM uses this to store and recall memory positions, to activate the easy entry/easy exit feature and to make sure the tilt and telescope motors do not stall against the end of travel. If a tilt or telescope motor sensor DTC is set, the DSM does not recall programmed memory positions or activate the easy entry/easy exit feature.

The memory position recall is also used when a valid programmed key is associated with one of the memory SET buttons. When detected, the BCM sends a message to the DSM, which moves the steering column to the position that is stored in the DSM memory.

Easy Entry, Easy Exit 

The easy entry/exit function moves the steering column to the full upward position when the vehicle is in PARK and the ignition is switched off.

The DSM records the current steering column position before powering the steering column for an easy exit operation. This recorded position returns the steering column to this position on the next easy entry operation. During easy entry operation, the steering column is either returned to the position previous to the easy exit operation or to the saved memory preset if a valid programmed key is used to enter the vehicle.

The DSM cancels this operation if a valid input is received from the steering column control switch or memory position switch.

The easy entry/exit feature can be activated or deactivated using the message center.

Jog Mode 

If the DSM detects an invalid or no signal from either of the steering column tilt/telescope motor sensors, the affected steering column motor operates only in jog mode. Jog mode allows limited operation of the affected steering column motor only when using the steering column control switch. When the steering column control switch is operated during jog mode, the steering column moves in the desired direction for two seconds and then stops. The steering column control switch must be released, then pressed again in order to move the steering column for an additional second. Jog mode is an indication there is a tilt or telescoping motor sensor or circuit fault. If the adjustable steering column operates in jog mode, a DTC should be set in the DSM.