Lumbar Support System Operation

WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.

The lumbar support motors are operated by a 2 position switch in each seat. Battery positive voltage and ground is provided to the lumbar switch through a battery positive voltage circuit and ground circuit at each seat.

Each lumbar support motor contains 2 control circuits.

The direction the motor operates, depends on how battery positive voltage and ground is applied to the control circuits of the motor. For example, when the lumbar switch is energized, battery positive voltage is supplied to one control circuit and ground is supplied to the other causing the lumbar support motor to move in one direction. When the lumbar switch is activated the other direction the polarity in the lumbar or bolster motor control circuits is reversed and that causes causing the motor to operate in the opposite direction.