The SEAT circuit breaker supplies power at all times through CKT 340 to the following relays:

The H SEAT/LUM fuse supplies power at all times through CKT 2040 to the driver seat lumbar adjuster switch.

The lumbar adjuster relays are grounded at G301 through CKT 750. The lumbar adjuster relays normally ground both sides of the following motors:

The following actions occur when the driver seat lumbar adjuster switch is set to the UP position:

1. Voltage is supplied through CKT 387 to the up/down lumbar adjuster relay.
2. The UP relay pulls in.
3. Voltage is supplied from CKT 340 along the following path:

3.1.	Through the normally open up relay contacts

3.2.	Through CKT 768

3.3.	To terminal B of the up/down lumbar support motor.

4. Terminal A of the up/down lumbar support motor is connected to G301 through the following components:

•

CKT 750

•	The normally closed up/down lumbar adjuster relay contacts of the down relay

•

CKT 767

5. The up/down lumbar support motor rotates.
6. The lumbar support is raised.

The following actions occur when the driver seat lumbar adjuster switch is set to the DOWN position:

1. Voltage is supplied through CKT 386 to the up/down lumbar adjuster relay.
2. The down relay pulls in.
3. Voltage is supplied from CKT 340 along the following path:

3.1.	Through the normally open down relay contacts

3.2.	Through CKT 767

3.3.	To terminal A of the up/down lumbar support motor

4. Terminal B of the up/down lumbar support motor is connected to G301 through the following components:

•

CKT 750

•	The normally closed contacts of the up relay of the up/down lumbar adjuster relay

•

CKT 768

5. The up/down lumbar support motor rotates.
6. The lumbar support is lowered.

The fore/aft lumbar support works in a similar manner, using the fore/aft lumbar adjuster relay and the fore/aft lumbar support motor.

Each motor has a solid state self-resetting circuit breaker. The circuit breakers protect the motors from overload.

The resistance in the electronic circuit breaker (ECB) increases if a motor is overloaded and returns to normal after voltage is removed from the motor terminals.