What fuse powers the power seat circuit?

A 30 A fuse in position 112 of the Battery Junction Box (hot at all times), shown on page 13-4 of the source manual.

What wire colors run from the power seat switch to the seat motors?

Circuit 990 VE/LB and 979 RD/LB (Front Height Motor), 981 RD/WH and 980 VE/WH (FWD/RWD Motor), and 982 VE/LG and 983 RD/LG (Rear Height Motor), passing through connectors C308M/C308F.

How is the power seat system grounded?

Through circuit 57 (BK) from the switch through connectors C305M/C305F and splice S304 to ground G200; grounds are referenced on page 10-7.

How many motors are in the seat motor assembly?

Three bi-directional motors: a Front Height Motor, a FWD/RWD Motor, and a Rear Height Motor, which drive the seat up, down, forward or rearward.

What does the power seat control switch do?

It controls the direction of current flow to operate each bi-directional motor clockwise or counterclockwise, moving the seat to the desired position. It has sections for front of seat, entire seat, and rear of seat.

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1999 Ford Power Seat Wiring Diagram - Switch, Motor & Ground Circuits

Power seat wiring diagram with control switch, bi-directional motors and color-coded circuits

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Wiring diagram of the power seat circuit showing the control switch, three bi-directional motors and color-coded wiring.

AI caption September 2008 · Photo 417 of 4867

This is a Ford power seat system wiring diagram. Power originates from a hot-at-all-times 30 A fuse (position 112) in the Battery Junction Box (referenced to page 13-4) and travels on circuit 566 (DG, dark green) through connectors C159M/C159F, C202F/C202M, C305F/C305M and C311M/C311F to the Power Seat Control Switch. The switch is divided into three sections — Front of Seat (up/down), Entire Seat (fwd/rwd and up/down), and Rear of Seat (up/down) — and reverses current flow to run each bi-directional motor clockwise or counterclockwise. Six output circuits pass through connectors C308M/C308F to the Power Seat Motor Assembly: 990 VE/LB and 979 RD/LB to the Front Height Motor, 981 RD/WH and 980 VE/WH to the FWD/RWD Motor, and 982 VE/LG and 983 RD/LG to the Rear Height Motor. Ground is provided on circuit 57 (BK, black) through C305M/C305F and splice S304 to ground point G200 (grounds referenced to page 10-7). Notes on the diagram explain that the seat motor assembly contains three bi-directional motors and that the control switch determines direction of current flow. A reader can use this to trace power, switch, motor and ground circuits for diagnosing power seat faults.

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Frequently asked questions

What fuse powers the power seat circuit?: A 30 A fuse in position 112 of the Battery Junction Box (hot at all times), shown on page 13-4 of the source manual.
What wire colors run from the power seat switch to the seat motors?: Circuit 990 VE/LB and 979 RD/LB (Front Height Motor), 981 RD/WH and 980 VE/WH (FWD/RWD Motor), and 982 VE/LG and 983 RD/LG (Rear Height Motor), passing through connectors C308M/C308F.
How is the power seat system grounded?: Through circuit 57 (BK) from the switch through connectors C305M/C305F and splice S304 to ground G200; grounds are referenced on page 10-7.
How many motors are in the seat motor assembly?: Three bi-directional motors: a Front Height Motor, a FWD/RWD Motor, and a Rear Height Motor, which drive the seat up, down, forward or rearward.
What does the power seat control switch do?: It controls the direction of current flow to operate each bi-directional motor clockwise or counterclockwise, moving the seat to the desired position. It has sections for front of seat, entire seat, and rear of seat.