Adaptive Steering System

The SECM controls the functions of the adaptive steering system and communicates with other modules through the SASM over the HS-CAN2. The SECM and the SASM communicate over a private CAN.

To activate, the SECM requires battery voltage, ignition voltage and must communicate with other modules over the HS-CAN2. The SECM must also receive the power pack status message from the PCM in order to activate.

The SECM uses a motor to turn a toothed hub connected to the steering shaft to add or subtract incremental turns to the driver steering shaft input. At low speeds the same steering input from the driver delivers more front wheel angle, providing more low-speed agility. Low speed maneuvers require significantly less steering wheel rotation. At high speeds, straight line driving precision is increased, providing the driver with an improved highway driving experience and feel during moderate-to-high-speed cornering.

As the driver turns the steering wheel, the SASM detects the speed and direction of the steering wheel rotation and transmits this information to the SECM over a private CAN. The SECM responds by activating the motor in the appropriate direction and speed to assist in turning the front wheels and reducing the necessary number of steering wheel turns required by the driver.

The SECM is self-monitoring and is capable of setting and storing Diagnostic Trouble Codes (DTCs). Depending on the nature of the DTC, the SECM may engage the adaptive steering lock and may send a request to the IPC to illuminate the adaptive steering system warning indicator and display a message in the message center alerting the driver of a potential adaptive steering system concern. The warning message is sent over the HS-CAN2 to the GWM where it is converted to a HS-CAN3 message and forwarded on to the IPC over the HS-CAN3.