Lumbar Controls

DESCRIPTION
Each seat incorporates a power inflate/power deflate pneumatic system used for altering the contour of the seat. This is accomplished by inflating and deflating a set of individual air bladders within each seat. Each lumbar seat system employs the following electrical components:
^ Lumbar Support Switches
^ Lumbar Manifold
^ Power Seat Pneumatic Control Module

Power is supplied to the Lumbar Support Switches at all times through I/P Fuse Block Power Lock Fuse #35. Each of the individual Lumbar Support Switches within the seat control has battery voltage applied to it. When lumbar support is requested, the Lumbar Support Switch applies voltage to the selected solenoid at the Lumbar Manifold.

The Lumbar Manifold is grounded through the Power Seat Pneumatic Control Module. At the same time, the Lumbar Support Switch applies battery voltage to the selected inflate or deflate relay within the Power Seat Pneumatic Control Module. The Power Seat Pneumatic Control Module applies power to the Seat Air Pump Assembly in either the forward direction (inflate) or the reverse direction (deflate).

The ground to the Lumbar Manifold is lifted when a pressure/vacuum sensor inside the Power Seat Pneumatic Control Module senses a bladder full/empty condition. In response to these conditions the Power Seat Pneumatic Control Module shuts off the pump and lifts the ground to the air management manifold until the switch paddle is released.