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Home >> Lincoln >> 2003 >> LS V8-3.9L VIN A >> Repair and Diagnosis >> Body and Frame >> Seats >> Testing and Inspection >> Pinpoint Tests >> Test S
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Test S

PINPOINT TEST S: THE POWER LUMBAR IS INOPERATIVE - PASSENGER


Test S1:






Test S2-S3:






Test S4-S5:






Test S6:






Normal Operation
The power lumbar operation is incorporated into the power seat switch. The passenger power seat switch is powered by battery voltage on circuit 30-AH46 (RD) and is supplied ground on circuit 31-AH46 (BK). When the lumbar knob of the power seat switch is pressed, voltage and ground are supplied to the power lumbar motor. When pressing the lumbar knob in the opposite direction, the power seat switch reverses the polarity to the power lumbar motor, which moves the lumbar mechanism in the opposite direction.

Possible Causes
An inoperative passenger power lumbar can be caused by:
- wiring, terminals, or connectors.
- a faulty seat control switch.
- a faulty power lumbar motor assembly.
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