Lumbar Pump

Lumbar pump
The lumbar pump inflates a bladder in the squab which provides extra support for the seat occupant. With no load on the seat it takes approximately 10 seconds to completely inflate the bladder. With a load of 25 kg (55 lb) it takes approximately 15 seconds to inflate the bladder. A pressure cut off switch in the system will operate at 0.12 to 1.93 bar (1.8 to 28 lbf. square inch). If a problem occurs with the lumbar bladder, e.g. a rupture, the whole lumbar system must be replaced. The components are not serviceable.

Power comes from the seat switch pack through a 3A fuse in the satellite fuse box. The lumbar pump and the lumbar deflate solenoid share an earth.