System Description - Lumbar Seats
OPERATIONWhen a Lumbar Switch is placed in the up position, voltage from Fuse C5 is applied to the Up/Down Lumbar Relay which energizes the up half of the relay. the relay energizing causes the up contacts to close connecting relay terminals C (CKT 297) and B (CKT 911) together. Voltage from Fuse 3 is now applied to the Up-Down Lumbar Motor. Because the motor is grounded through CKT 912 and the down relay contacts, the lumbar motor now begins to run, moving the lumbar support up the seat back.
The lumbar support can be moved down the seat back by depressing the down switch. the circuit operation for the down mode is similar to the up mode, except the Up-Down Lumbar Motor's polarity is reversed, causing the motor to run in the opposite direction.
When down operation is desired battery voltage from Fuse C5 is applied to the Down Relay coil in the Up-Down Lumbar Relay. the relay energizes, applying power from Fuse 3 to the Up/Down Lumbar Motor through CKT 912. the motor is grounded this time through CKT 911 and the up relay contacts to ground G302.
Fore and Aft Operation
Fore and Aft operation is similar to the Up-Down operation, except the motor moves the lumbar support in and out of the seat back.