The tilt/telescoping steering column has a four-position switch which may be used to adjust the position of the steering wheel in or out (telescope) and up or down (tilt). The position of the column may be changed as follows:

The steering column tilt/telescoping module (TTM) receives inputs from the tilt/telescope switch to manually move the column to a desired position. Pressing the tilt/telescope switch sends an input to the TTM. When the TTM receives an input, it actuates the corresponding column motor.

Pressing the switch momentarily in either the UP or DOWN, or IN or OUT (releasing it within 0.5 seconds) position, causes the column to "jog" a slight distance, in the corresponding direction then stop. This feature allows fine control of the steering column position in each direction. If the switch is pressed and held (for longer than 0.5 seconds), the column "jogs" a slight distance in that direction, pauses, then resumes movement as long as the switch is Pressed.

Both the tilt and telescoping motors are reversible. For example, the tilt motor moves the column both up and down. When the TTM receives an input to move the column up, it supplies battery positive voltage and ground to the tilt motor in order to move the column up. When the TTM receives a column down input, it supplies battery positive voltage and ground to the same motor, but with a reverse polarity. When the voltage polarity is reversed and the motor runs in the opposite direction, it moves the column down.

Two position sensors are used by the TTM to store column positions in memory and to return the column to the stored memory positions. The TTM provides a 5 volt reference voltage and a ground to both the tilt and telescoping position sensors. The sensor feedback circuit voltage varies from 0.25 volts to 4.75 volts. Each sensor is mounted to its corresponding motor cable assembly. When the motor rotates its cable, the resistance of the sensor varies. The TTM monitors the feedback voltage to determine the column position via the tilt and telescoping position sensor input circuits. When an entry or exit position is saved, the TTM stores the column positions by recording each position sensor's feedback voltage. When an entry or exit position is commanded, the module moves the motors until all the position sensor feedback voltages equal the feedback voltages stored in memory.

Memory settings and the personalization of steering wheel positions are available with the tilt/telescoping steering column. The data stored consists of entry positions and exit positions. The entry position is the position that the steering column moves in when the ignition is turned ON. The exit position is the direction that the steering column moves in when the ignition is turned OFF and the driver's door is opened.

An initial memory setting is set in the steering column tilt/telescoping module (TTM) at the assembly plant. This setting may be changed or "personalized" by the customer at the time of purchase or anytime in the future.

The steering column tilt/telescoping module (TTM) stores personalization information. The driver information center (DIC) is used to enable and disable the personalization feature in the steering column tilt/telescoping module (TTM). A Class 2 message is sent to the TTM, by the driver information center (DIC), which specifies that the TTM enable the personalization feature until disabled again using the DIC.

The tilt/telescoping steering column module can store six possible positions, three entry positions and three exit positions.

The left hand front door module (LHFDM) receives the inputs from the memory function switch. The current steering column entry and exit positions may be recorded for two different drivers. To record the current positions, the SET MEMORY button is pressed, which is followed by a chime to acknowledge the input. Within 5 seconds, either the MEMORY-1 or MEMORY-2 button is pressed. When the LHFDM receives these inputs, it sends a Class 2 message to the TTM and the TTM records the feedback voltages from the column position sensors for the appropriate driver. A single chime is sounded to acknowledge that the position was recorded.

When the MEMORY-1 or MEMORY-2 button is pressed, the LHFDM receives the input and a single chime is sounded. The LHFDM sends a Class 2 message to the TTM indicating which driver memory setting has been selected. The TTM applies battery positive voltage (B+) to the column motors until all the column position sensor feedback voltages equal the feedback voltages stored in memory for the appropriate driver. When a keyless entry transmitter is used to unlock the vehicles doors, the remote function actuator (RFA) module communicates the unlock command and which driver performed the command to the steering column tilt/telescoping module (TTM) via a Class 2 message. There are three personalized recall options when the LHFDM receives an unlock message: