Optional Seat Back Lumbar Support: Operation

The lumbar support system can be operated at any time regardless of key position. The four position circular rocker switch provides power switching to operate the system as follows:

• Position 1: The internal switch contacts provide a power and ground path for both valve block inlet valves and the air compressor. Both bladders inflate until the switch is released. If the switch is held continuously, an overpressure bypass valve opens on the compressor preventing damage to the bladders.
• Position 2: Compressor activated, upper bladder inflates, lower bladder deflates
• Position 3: Compressor activated, lower bladder inflates, upper bladder deflates
• Position 4: Compressor is not activated. Upper and Lower bladders both deflate.