Passenger 8-Way Power Seat

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

Seat adjuster Switch and Motors

The seat adjuster switches provide both power and ground to the selected seat motors. Battery voltage is supplied at all times to the passenger seat adjuster switch through a 30 A fuse located in the underhood fuse block. When the seat switches are in an inactive state, the switch contacts are closed to the switch ground circuit. The seat front vertical, rear vertical, and recline motors are completely controlled through their respective seat adjuster switches. However, the seat horizontal motor is controlled through the driver seat memory control module

All of the seat motors operate independently of each other. Each motor contains an electronic circuit breaker (PTC) that opens in the event of a circuit overload and will reset only after voltage has been removed from the circuit. These are the horizontal motor, front vertical motor, rear vertical motor, and the seat back recline motor. The seat horizontal motor moves the entire seat forward and rearward, the seat vertical motors may operate independently to tilt the front or rear of the seat cushion up or down, or both motors can run simultaneously to move the entire seat up or down. The recline motor moves the angle of the seat back forward or rearward.

Seat Front Vertical, Rear Vertical, and Recline Motor Operation

All seat motors are reversible. For example, when the seat front vertical up switch is pressed to tilt the front of the seat up, battery voltage is applied through the switch contacts and the seat front vertical motor up control circuit to the motor. With the front vertical motor down switch contacts closed to the switch ground circuit, the motor runs in order to drive the front of the seat up until the switch is released. Moving the front of the seat down works similarly to moving the front of the seat up, except that battery voltage and ground are applied on opposite circuits causing the motor to run in the opposite direction. All seat motors, except the seat horizontal motor, are powered this way.

Seat Horizontal Motor Operation

When the passenger seat horizontal switch is pressed to move the entire seat forward, battery voltage is applied through the switch signal circuit to the driver seat memory control module indicating the entire seat forward command. In response to this signal, the seat memory control module applies battery voltage through the passenger seat horizontal motor forward control circuit and ground through the passenger seat horizontal motor rearward control circuit to the motor. The motor runs to drive the entire seat forward until the switch is released. Moving the entire seat rearward works similarly to moving the entire seat forward, except that battery positive voltage and ground are applied on the opposite circuits causing the motor to run in the opposite direction.