1997 Mercury Villager LSFACTORY OEM SERVICE PROCEDURE

One Power Window Inoperative

  1. Check power window master switch. See POWER WINDOW MASTER SWITCH under COMPONENT TESTING  . If master switch is defective replace switch. If master switch is okay, go to next step.
  2. Check operation of power window motor in question. See POWER WINDOW MOTOR under COMPONENT TESTING  . If power window motor is defective, replace motor. If power window motor is okay, go to next step.
  3. Turn ignition off. Disconnect power window master switch. See POWER WINDOW MASTER SWITCH  under REMOVAL & INSTALLATION. Using ohmmeter, check resistance between ground and power window master switch connector Black wire. See WIRING DIAGRAM  . If resistance is less than 5 ohms and problem is with left door window, go to next step. If resistance is less than 5 ohms and problem is with right door window, go to step 5). If resistance is greater than 5 ohms, repair Black wire.
  4. Turn ignition off. Disconnect power window master switch and left door window motor. Using ohmmeter, check resistance of Blue/Red wire and Purple wire between master switch harness connector and left door motor harness connector. Resistance should be less than 5 ohms. Check resistance between ground and master switch harness connector Blue/Red and Purple wires. Resistance should be greater than 10 k/ohms. If resistance is as specified, go to next step. If resistance is not as specified, repair wire(s) in question.
  5. Turn ignition off. Disconnect right door window switch. See SINGLE POWER WINDOW SWITCH  under REMOVAL & INSTALLATION. Turn ignition on. Using voltmeter, check voltage between ground and right door window switch harness connector Orange/Black wire. If voltage is greater than 10 volts, go to next step. If voltage is less than 10 volts, repair Orange/Black wire. See WIRING DIAGRAM  .
  6. Check right door window switch operation. See SINGLE POWER WINDOW SWITCH under COMPONENT TESTING  . If switch is defective, replace switch. If switch is okay, go to next step.
  7. Turn ignition off. Disconnect power window master switch and right door window switch. Using ohmmeter, check resistance of Light Green/Black wire and Orange/Blue wire between master switch harness connector and right door window switch harness connector. Resistance should be less than 5 ohms. Check resistance between ground and master switch harness connector Light Green/Black and Orange/Blue wires. Resistance should be greater than 10 k/ohms. If resistance is as specified, go to next step. If resistance is not as specified, repair wire(s) in question. See WIRING DIAGRAM  .
  8. Turn ignition off. Disconnect right door window switch and right door window motor connectors. Using ohmmeter, check resistance of Blue/Orange wire and Blue/Yellow wire between right door window switch connector and right door window motor connector. See WIRING DIAGRAM  . Resistance should be less than 5 ohms. Check resistance between ground and right door window switch connector Blue/Orange and Blue/Yellow wires. Resistance should be greater than 10 k/ohms. If resistance is as specified, replace right door window motor. If resistance is not as specified, repair wire in question.
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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.