Lumbar Supports

CIRCUIT OPERATION

Lumbar Support
The contour sports seats incorporate a power inflate/power deflate pneumatic system used for controlling comfort seat features by inflating or deflating air cells within the sea. The major components of the pneumatic system are the console seat switch, the seat air pump assembly, the seat control module and the seat solenoid/valve assemblies.

Power is applied at all times to the console seat switch. Whenever an adjustment is to be made, the seat select switch must be set to the LEFT or RIGHT position. This action supplies battery voltage to each of the three comfort feature switches and prepares a ground path (from terminal J, connector C1, on the console seat switch) for either the LH or RH seat solenoid/valve assembly.

All three comfort feature switches operate in a similar manner. If any one is moved to the INFLATE position, for example, battery voltage is applied through the WHT (766) wire to the inflate relay, which is energized. When any switch is moved to the DEFLATE position, battery voltage is applied through the GRY (764) wire to energize the deflate relay.

At the same time, battery voltage is also applied to the associated solenoid coil in the seat solenoid/valve assemblies from the other half of the feature switch. If, for example, the seat select switch is moved to the LEFT position and the lower lumbar switch is held in the INFLATE position, the inflate relay is energized through the WHT (766) wire; the lower lumbar solenoids in the LH seat solenoid/valve assembly is energized through the PNK (789) wire. Battery voltage is also be applied to the lower lumbar solenoid in the RH seat solenoid/valve assembly, but the Solenoid is not energized because there is not a path to ground. The ground path for the LH seat solenoid is through the TAN/BLK (797) wire to console seat switch connector C2 (terminal F); through seat select switch; through the BLK/WHT (769) wire to seat control module terminal A; through the normally closed contacts of ;the pressure cut-out relay, and to ground G203 through the BLK (154) wire at seat control module terminal B.

The deflate and inflate relays apply proper voltage polarity to the seat air pump assembly. When the inflate relay is energized, battery voltage at seat control module terminal F is applied through the closed contacts of the inflate relay to seat air pump assembly terminal A through the PNK (768) wire. Seat air pump assembly terminal B is grounded through the normally closed pressure cut-out relay contacts, the normally closed deflate relay contacts and the BLK (154) wire at seat control module terminal E.

When the deflate relay is energized, battery voltage is applied to seat air pump assembly terminal B through the normally closed pressure cut-out relay contacts. Terminal A is grounded through the normally closed inflate relay contacts. In this way, the Air Pump runs in either direction to inflate or deflate the bladders in the seat as required.

Should any bladder become fully inflated or deflated, the increased pressure or vacuum operates the pressure cut-out switch, which allows the pressure cut-out relay to be energized whenever the air pump is operated. When the pressure cut-out relay is energized, the seat air pump motor circuit and solenoid/valve circuit are interrupted.

Power Recline
The contour sport seats also feature a power recline function. This function is controlled by the seat select switch and the recliner switch. Voltage is applied at all times from relay center fuse 3 to the seat select switch. With the seat select switch in LEFT or RIGHT, voltage is applied to the recliner switch.

When the recliner switch is held in the DOWN position, voltage is applied to the seat recline up relay of the seat selected. This energizes the relay, which is grounded through the seat select switch and the seat control module. When the relay is energized, its contacts close, applying voltage from IP fuse block circuit breaker 4, through the relay, to the seat recliner motor.

The seat recliner motor is grounded through the seat recline up relay. The seat recliner motor runs, and the seat reclines smoothly.

When the recliner switch is held in the UP position, voltage is applied to the seat recline up relay. This relay energizes, providing voltage to the seat recliner motor. The motor, now grounded through the seat recline down relay, runs in the opposite direction. The seat rises smoothly.

When the recliner switch is held in the DOWN position, voltage is applied to the seat recline up relay of the seat selected. This energizes the relay, which is grounded through the seat select switch and the seat control module. When the relay is energized, its contacts close, applying voltage from IP fuse block circuit breaker 4, through the relay, to the seat recliner motor.

The seat recliner motor is grounded through the seat recline up relay. The seat recliner motor runs, and the seat reclines smoothly.

When the recliner switch is held in the UP position, voltage is applied to the seat recline up relay. This relay energizes, providing voltage to the seat recliner motor. The motor, now grounded through the seat recline down relay, runs in the opposite direction. The seat rises smoothly.