Test H: The Memory Seat Is Inoperative - Expedition Limited And Navigator

PINPOINT TEST H: THE MEMORY SEAT IS INOPERATIVE - EXPEDITION LIMITED AND NAVIGATOR

H1:

H2-H4:

H5-H7:

H7-H8:

H8-H10:

H11-H13:

H13-H15:

H15-H17:

H17-H19:

H19-H21:

H21-H23:

H23-H25:

H25-H27:

H27-H29:

H29-H31:

H31 Continued:

Normal Operation
The driver power seat switch is powered by battery voltage on circuit 956 (OG/LG) and is supplied ground on circuit 875 (BK/LB). When pressed, the power seat switch supplies the voltage and ground to the driver seat module (DSM). The DSM then supplies voltage and ground to the appropriate power seat motor based on the inputs received from the seat control switch. When pressed in the opposite direction, the power seat switch reverses the polarity to the DSM, which moves the seat in the opposite direction. There are 4 power seat motors that combine to move the seat horizontally (forward/reverse), vertically (front up/down and rear up/down) and recline the backrest. All seat motors are serviceable separately.

Possible Causes
An inoperative memory seat can be caused by:
- fuse.
- wiring, terminals or connectors.
- a faulty seat control switch.
- a faulty power seat motor.
- a faulty driver seat module (DSM).