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Test M: Passenger's Power Lumbar Inoperative

WARNING: This page is about a different car, the 2002 Lincoln Blackwood. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Vehicle is equipped with seatback-mounted air bags. Deactivate air bag system before performing any service operation involving seat components. See AIR BAG RESTRAINT SYSTEMS article in RESTRAINTS.
CAUTION: Air Bag Simulator (40-009) MUST be connected to all air bag floor harness connectors. After diagnosis/repair, air bag simulator must be removed prior to operating vehicle.
  1. Disconnect passenger's side lumbar switch harness connector C331. Measure voltage at lumbar switch harness connector terminal No. 2 (Red/White wire). See Figure. If battery voltage exists, go to next step. If battery voltage does not exist, repair open in Red/White wire between battery junction box and lumbar switch.
  2. Measure resistance between ground and lumbar switch harness connector terminals No. 3 and 6 (Black wires). If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Black wire(s) between lumbar switch and ground. Ground point is located behind left rear seat. See WIRING DIAGRAMS .
  3. Connect passenger's side lumbar switch harness connector C331. Disconnect passenger's side lumbar motor harness connector C336. Measure voltage between Brown and Pink wires at lumbar motor harness connector. Operate lumbar switch in both directions. If battery voltage exists in both directions, go to next step. If battery voltage does not exist in both directions, replace passenger's side lumbar motor switch. See SEAT CONTROL SWITCHES (INCLUDING TEMPERATURE CONTROL AND LUMBAR)  under REMOVAL & INSTALLATION.
  4. Disconnect passenger's side lumbar switch harness connector C331. Measure resistance between ground and terminal No. 7 (Pink wire) at passenger's side lumbar switch harness connector. See Figure. Measure resistance between ground and passenger's side lumbar switch harness connector terminal No. 1 (Brown wire) at. If each resistance is more than 10 k/ohms, go to next step. If any resistance is 10 k/ohms or less, repair short to ground in appropriate wire. See WIRING DIAGRAMS .
  5. Measure resistance in Brown wire between lumbar motor harness connector and passenger's side lumbar switch harness connector. Measure resistance in Pink wire between lumbar motor harness connector and passenger's side lumbar switch harness connector. If each resistance is 5 ohms or less, replace passenger's side lumbar motor. See POWER LUMBAR MOTOR  under REMOVAL & INSTALLATION. If each resistance is more than 5 ohms, repair open in Brown or Pink wires between passenger's lumbar motor and passenger's lumbar switch.
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