Position Sensors

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2011 GMC Yukon XL, 2011 GMC Yukon, 2011 Chevrolet Tahoe, 2011 Chevrolet Suburban, and 2011 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

The position sensors are potentiometers which are either attached directly to the motor transmission cable or are an internal part of the motor. The MSM supplies a 5 V reference through the 5 V reference circuit and ground through the sensor low reference circuit to the respective seat, lumbar, and adjustable pedal position sensors. For more information regarding the adjustable pedals, refer to Adjustable Pedals Description and Operation (with Memory) , Adjustable Pedals Description and Operation (w/o Memory) . When the motor or cable rotates, the resistance of the potentiometer varies changing the feedback voltage of the position sensor signal circuit. The voltage varies from 0.22 - 4.75 V. The MSM monitors this voltage signal to determine the position of the seat. When a memory set command is received, the MSM records the seat position by storing the feedback voltage from each position sensor. Then when a memory recall command is received, the MSM moves the motors until the position sensor feedback voltages equals the feedback voltages stored in memory.