Lumbar Support Description and Operation (With RPO Code AC9)

LUMBAR SUPPORT DESCRIPTION AND OPERATION (WITH AC9)

ADAPTIVE LUMBAR SUPPORT COMPONENTS
The driver and passenger adaptive seat systems each consist of the following components:
- Lumbar Switch
- Adaptive Lumbar Module
- Pump Motor
- Air Bladders
- MEM T&T Fuse 10 A
- IGN 3 Fuse 10 A

This is a power inflate/deflate pneumatic system used for controlling seat comfort by inflating or deflating an air cell within the seat. The adaptive seat system will only operate when the ignition switch is in the ON position.

Battery positive voltage is supplied at all times to the driver and passenger adaptive lumbar modules and pump motors through the battery positive voltage circuit and the MEM T&T Fuse located in the rear fuse block. With the ignition in the ON position, battery voltage is also supplied to both adaptive lumbar modules through the ignition 3 voltage circuit and the IGN 3 Fuse located in the rear fuse block.

MANUAL CONTROL
The lumbar support in the seat back may be adjusted manually. When the lumbar switch is operated to move the lumbar forward or to increase the amount of lumbar support, the lumbar forward signal circuit of the adaptive lumbar module is pulled low through the switch contacts and ground. In response to this signal, the adaptive lumbar module provides a ground for the pump motor through the pump motor controlled ground circuit. The pump motor runs to inflate the lumbar bladder in the seat back until the switch is released. When the lumbar switch is operated to move the lumbar rearward or decrease the amount of lumbar support, the lumbar rearward signal circuit of the adaptive lumbar module is pulled low through the switch contacts and ground. In response to this signal, the adaptive lumbar module releases air from the lumbar support bladder until the switch is released.

ADAPTIVE CONTROL
Momentarily press the top of the lumbar switch where it is marked AUTO in order to activate the adaptive seat function. The auto/on signal circuit of the adaptive lumbar module is pulled low through the switch contacts and ground. In response to this signal, the adaptive lumbar module will inflate the system as described above, take a reading, then automatically adjust the comfort level to the occupant by releasing air from the bladders or adding air into the bladders when needed. The adaptive lumbar module will check the position of the occupant every 4 minutes. If the occupant has moved, the adaptive lumbar module will then automatically adjust the support.

When the lumbar switch is pressed down in the OFF position to turn off the automatic adjustment, the off/down signal circuit of the adaptive lumbar module is pulled low through the switch contacts and ground. In response to this signal, the adaptive lumbar module will release all air from the bladders.