Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLINCOLN2007MKZ FWD V6-3.5L VIN TREPAIR AND DIAGNOSISBODY AND FRAMESEATSTESTING AND INSPECTIONPINPOINT TESTSTEST M: THE POWER LUMBAR IS INOPERATIVE - DRIVER
2007 Lincoln MKZ FWD V6-3.5L VIN T
Test M: The Power Lumbar Is Inoperative - Driver
2007 Lincoln MKZ FWD V6-3.5L VIN TSECTION Test M: The Power Lumbar Is Inoperative - Driver
PINPOINT TEST M: THE POWER LUMBAR IS INOPERATIVE - DRIVER
Normal Operation
The seat control switch is powered by battery voltage on circuit SBB15 (WH/RD) and is supplied ground on circuit GD126 (BK/WH). When the knob of the seat control switch is pressed, voltage and ground are supplied to the power lumbar motor. When pressing the lumbar knob in the opposite direction, the lumbar control switch reverses the polarity to the power lumbar motor, which moves the lumbar mechanism in the opposite direction.
Possible Causes
An inoperative power lumbar can be caused by:
- wiring, terminals or connectors.
- a faulty lumbar control switch.
- a faulty power lumbar motor assembly.
M1-M2:
M3-M4:
M5:
Normal Operation
The seat control switch is powered by battery voltage on circuit SBB15 (WH/RD) and is supplied ground on circuit GD126 (BK/WH). When the knob of the seat control switch is pressed, voltage and ground are supplied to the power lumbar motor. When pressing the lumbar knob in the opposite direction, the lumbar control switch reverses the polarity to the power lumbar motor, which moves the lumbar mechanism in the opposite direction.
Possible Causes
An inoperative power lumbar can be caused by:
- wiring, terminals or connectors.
- a faulty lumbar control switch.
- a faulty power lumbar motor assembly.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.