Lumbar Support

The lumbar support system consists of a switch, a lumbar support (air bag), a pump and motor assembly, related wiring harness and plastic tubing.

During the inflate mode, the compressor pumps air through a hose to the lumbar switch check valve where air is routed through a separate hose to the lumbar located at the seat back. Except for lumbar support bag, all components are generally located at or under the seat cushion frame.

The switch performs three functions.

• Turns motor on which turns air pump on.
• Acts as a one-way check valve for air passage to lumbar bag. Once inflated, the switch is returned to its normal mode and the check valve closes. This maintains air pressure in the bag.
• When deflated, the check valve opens to deflate the lumbar bag. In this mode, the pump does not operate.

 CAUTION: The longer nipple on the switch (located at the center of the switch body) should always be connected to the hose leading to the lumbar support. The shorter nipple on the switch body connects to the air pump outlet. If this order is reversed, the lumbar bag will not hold air pressure.