Lumbar Supports

Battery voltage from the SEAT Circuit Breaker is supplied to both the Up/Down Lumber Adjuster Relay and The Fore/Aft Lumber Adjuster Relay through CKT 340. Battery voltage from the H SEAT/LUM Fuse is supplied to the Driver Seat Lumber Adjuster Switch through CKT 2040. The Up/Down Lumbar Adjuster Relay and the Fore/Aft Lumbar Adjuster Relay, which are grounded at G301 through CKT 750, normally ground both sides of the Up/Down Lumbar Support Motor and the Fore/Aft Lumbar support Motor, When the Driver Seat Lumbar Adjuster switch is pressed to the UP position, voltage is supplied Through CKT 387 to the Up/Down Lumbar Adjuster Relay, causing the Up relay to pull in. Voltage is then supplied from CKT 340, through the Up relay normally open contacts and CKT 768 to terminal B of the Up/Down Lumbar Support Motor. Terminal A of the Up/Down Lumbar Support Motor is connected to G301 through CKT 750, Up/Down Lumbar Adjuster Relay normally closed contacts of the Down relay, and CKT 767. This causes the Up/Down Lumbar Support Motor to rotate to raise the Lumbar Support.

When the Driver Seat Lumbar Adjuster Switch is pressed to the DOWN position, voltage from CKT 2040 is supplied through CKT 386 to the Up/Down Lumbar Adjuster Relay Down relay to send voltage through CKT 340, the normally open contacts of the Down relay, and CKT 767 to terminal A of the Up/Down Lumbar Support Motor. Ground is supplied from G301, through CKT 750, the normally closed contacts of the Up relay in the Up/Down Lumbar Adjuster Relay, and CKT 768, to terminal B of the Up/Down Lumbar Support Motor. This causes the Up/Down Lumbar Support Motor to rotate in the other direction to lower the Lumbar Support.

The Fore/Aft Lumbar Support works in a similar method using the Fore/Aft Lumbar Adjuster Relay and the Fore/Aft Lumbar Support Motor.

Each motor contains a solid state self-resetting circuit breaker to protect it from overload.