System Operation
System Diagram
Network Message Chart
| Broadcast Message | Originating Module | Message Purpose |
|---|---|---|
| Memory command | BCM | Message to recall a saved adjustable position when the memory set switch is pressed. The message is transmitted from the BCM to the SCCM. |
| Easy entry/exit request | BCM | Message to adjust the steering column to the full upward and inward position when the ignition is turned OFF and returns to the previous position when the ignition is turned ON. This message is sent from the BCM to the SCCM. |
| Ignition status | BCM | Message to indicate the vehicle ignition status. This message is sent from the BCM to the SCCM. |
Manual Adjustable Steering Column
The manual adjustable steering column is controlled by a mechanical lever on the underside of the steering column, which uses a cam to lock and unlock the steering column. The steering column can be adjusted when the lever is pulled downward. When the steering column is in the desired position(s), pulling the lever upward to its original position locks the steering column.
Power Adjustable Steering Column
The power adjustable steering column is controlled by the steering column control switch, the memory SET switch or the RKE transmitter. The power adjustable steering column can be adjusted upward, downward, inward and outward using the steering column control switch.
Jog Mode
If the SCCM loses the signal from either of the motor sensors, the affected steering column motor operates in jog mode. Jog mode allows limited operation of the affected steering column motor using only the steering column control switch. When the steering column control switch is operated in jog mode, the steering column moves in the desired direction for one second, 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 that there is a tilt or telescoping motor sensor fault. If the adjustable steering column is operating in jog mode, a DTC may set in the SCCM.
Memory Position Programming And Recall
The SCCM monitors the steering column position using Hall-effect sensors that are integral to the tilt and telescopic motors. When a memory position is recalled through either the memory SET switch or the RKE transmitter, the SCCM monitors the Hall-effect sensors and stops sending voltage to the steering column motors once the commanded memory position is reached. If the SCCM 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 the RKE transmitter is activated, a message is sent over the MS-CAN to the DSM. When the memory SET switch is pressed, the DSM senses continuity to ground on the switch circuit. When the DSM receives either the MS-CAN message or the ground input through the switch circuit, it sends a message over the MS-CAN to the BCM. The BCM acts as a gateway module, relaying the MS-CAN message that was received from the DSM to the SCCM over the HS-CAN. The SCCM then sends voltage over the appropriate circuit to the steering column tilt or telescopic motor to adjust the steering column position.
For information on setting and recalling a memory position, refer to the Owner's Literature or Seating .
Easy Entry/Exit
The easy entry/exit function moves the steering column to the full inward and upward position when the selector lever is in the PARK position and the ignition is off (if equipped with push button start) or if the ignition switch indicates the ignition key has been removed from the ignition lock cylinder (if equipped with an ignition switch).
The SCCM monitors the steering column position using Hall-effect sensors that are integral to the tilt and telescopic motors. For vehicles equipped with a conventional ignition switch, the SCCM commands the steering column to the full upward/forward position when the SCCM receives a message over the HS-CAN indicating that the key has been removed from the lock cylinder. For vehicles equipped with a push button start system, this occurs when the ignition status message indicates the ignition state has transitioned to off. The SCCM cancels this operation if a valid input is received from the steering column control switch or memory position switch.
The SCCM records the current steering column position before powering the steering column for an easy exit operation and then returns the steering column to the recorded position on the next easy entry operation.
The easy entry/exit feature can be activated or deactivated using the message center. Refer to Information Displays in the Owner's Literature for information about using the message center to activate or deactivate the feature.