GM Service Manual Online
For 1990-2009 cars only

Power Seat Description

The 6 way power seat system incorporates three reversible motors and a power seat adjuster switch to operate the power seat. The front tilt motor raises or lowers the front of the seat. The rear tilt motor raises or lowers the rear of the seat. The forward/rearward motor moves the seat forward or rearward.

Power for the power seat system is supplied from the PWR ACCY circuit breaker through CKT 540 (ORN) to the power sear adjuster switch. Ground is supplied from G202 through CKT 150 (BLK) to the power seat adjuster switch.

Front Tilt Description

By placing the front tilt switch in the UP position, voltage is applied to the front tilt motor through CKT 287 (DK BLU). The motor is grounded through the normally closed contacts of the front tilt switch through CKT 286 (DK GRN) thus, raising the front of the seat. By positioning the front tilt switch in the DOWN position the polarity is reversed and the front of the seat is lowered.

The circuit numbers used in this description are for the LF seat, the RF seat operates the same way but the circuit numbers change.

Rear Tilt Description

The rear tilt motor is operated in the same way as the front tilt motor through the rear tilt switch.

By placing the rear tilt switch in the UP position, voltage is applied to the rear tilt motor through CKT 283 (LT BLU). The motor is grounded through the normally closed contacts of the rear tilt switch through CKT 282 (YEL) thus, raising the rear of the seat. By positioning the rear tilt switch in the DOWN position the polarity is reversed and the rear of the seat is lowered.

The circuit numbers used in this description are for the LF seat, the RF seat operates the same way but the circuit numbers change.

Up / Down Description

The UP / DOWN function of the power seat uses the front tilt and the rear tilt motors at the same time. By doing this, the entire seat can be raised or lowered depending on the switch position. The circuits for this are the same as mentioned above in Front Tilt and Rear Tilt Operation.

Forward / Rearward Description

By placing the entire seat switch in the forward position, voltage is applied to the forward / rearward motor through CKT 285 (TAN).The motor is grounded through the normally closed contacts of the entire seat switch through CKT 284 (LT GRN) thus, moving the seat forward. By positioning the entire seat switch in the rearward position the polarity is reversed and the seat moves rearward.

The circuit numbers used in this description are for the LF seat, the RF seat operates the same way but the circuit numbers change.