Memory Position Programming and Recall

The DSM monitors the steering column position using Hall-effect sensors that are integral to the tilt and telescopic motors. The sensors provide a digital signal used by the DSM to calculate the position of the steering column in relation to the full forward, full rearward, full up and full down positions. The DSM uses this signal to store and recall memory positions, to perform the easy entry/exit operations and to make sure the tilt and telescopic motors do not stall against the steering column end of travel. If a tilt motor sensor DTC or telescopic motor sensor (also called reach motor sensor) DTC is set, the DSM does not recall a programmed memory position or automatically position the steering column during the easy entry/easy exit operations.

The memory SET switch is monitored by the DDM. When a memory position is recalled through the memory SET switch, the DDM sends a MS-CAN message to the DSM. The DSM activates the tilt/telescopic motor(s) and monitors the Hall-effect sensors 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 motor(s). 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.

When a programmed RKE transmitter is activated, the BCM sends a High Speed Controller Area Network 1 (HS1-CAN) message to the GWM. The GWM then sends a MS-CAN message to the DSM, which moves the steering column to the position that is stored in the DSM memory.

A hard stop occurs when one of the memory column axes physically reach the end of travel and can go no further. A soft stop occurs when the column stops before it physically reaches the end of travel. The hard stop is set by column design and cannot be changed or adjusted. The soft stop is set by the DSM. The memory column axes are up/down and in/out. To prevent unnecessary stress on the column and motors, the DSM sets soft stop positions, 2 for each moving axis. The DSM uses a preset distance from the hard stop to determine where the soft stop occurs. When an axis reaches the hard stop and the switch is held for approximately one second, the DSM briefly reverses direction and establishes the soft stop for that axis in that direction. The DSM uses this back up strategy to check sensor integrity any time movement has stopped prematurely due to a sensor failure or obstruction. A hard stop occurs when one of the memory column axes physically reach the end of travel and can go no further. A soft stop occurs when the column stops before it physically reaches the end of travel. The hard stop is set by column design and cannot be changed or adjusted. The soft stop is set by the DSM. The memory column axes are up/down and in/out. To prevent unnecessary stress on the column and motors, the DSM sets soft stop positions, 2 for each moving axis. The DSM uses a preset distance from the hard stop to determine where the soft stop occurs. When an axis reaches the hard stop and the switch is held for approximately one second, the DSM briefly reverses direction and establishes the soft stop for that axis in that direction. The DSM uses this back up strategy to check sensor integrity any time movement has stopped prematurely due to a sensor failure or obstruction.