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Power Window Circuit

  1. Check Fuse & Power Supply

    Check appropriate power window fuse in fuse panel. If fuse is okay, go to next step. If fuse is blown, repair short to ground in circuit between fuse box and power window relay. See WIRING DIAGRAMS  .

  2. Check Power Window Relay

    Remove and check power window relay. See POWER WINDOW RELAY TEST  under COMPONENT TESTS. If power window relay is okay, go to next step. If power window relay is defective, replace relay.

  3. Check Relay Ground

    Check resistance in Black wire between ground and power window relay harness connector terminal No. 3 (terminal No. 2 on Legacy). See WIRING DIAGRAMS  . If resistance is 10 ohms or less, go to next step. If resistance is greater than 10 ohms, repair open circuit.

  4. Check Relay Power

    Check voltage between ground and power window relay harness connector terminal No. 3 (terminal No. 4 on Legacy). See WIRING DIAGRAMS  . If battery voltage exists, go to next step. If battery voltage does not exist, repair open circuit.

  5. Check Green/Black Wire For Open

    Disconnect power window main switch harness connector. Check resistance in Green/Black wire between power window main switch and power window relay harness connectors. See WIRING DIAGRAMS  . If resistance is 10 ohms or less, go to next step. If resistance is greater than 10 ohms, repair open circuit.

  6. Check Power Window Main Switch

    Remove power window main switch and disconnect harness connector. Check power window main switch. See POWER WINDOW MAIN SWITCH TEST  under COMPONENT TESTS. If power window main switch is okay, go to next step. If power window main switch is defective, replace power window main switch.

  7. Check Power Window Main Switch Ground

    Check resistance between ground and Black wire terminal at power window main switch harness connector. See WIRING DIAGRAMS  . If resistance is 10 ohms or less, go to next step. If resistance is greater than 10 ohms, repair open in circuit.

  8. Check Suspect Door Motor

    Disconnect suspected power window motor harness connector. Briefly apply battery voltage across motor terminals. Ensure motor operates smoothly. Reverse polarity and ensure motor operates smoothly in opposite direction. If motor operates as described, go to next step. If motor does not operate as described, replace defective motor.

  9. Check Harness

    Check resistance in wires between power window main switch harness connector and inoperative window motor harness connector. See WIRING DIAGRAMS  . If resistance is greater than 10 ohms in either wire, go to next step. If resistance is 10 ohms or less in both wires, go to step  11 .

  10. Check Sub-Switch

    Remove sub-switch of inoperative window. Check sub-switch. See POWER WINDOW SUB-SWITCH TEST  under COMPONENT TESTS. If sub-switch is okay, repair open in appropriate wire between power window main switch and inoperative window motor. See WIRING DIAGRAMS  . If sub-switch is defective, replace sub-switch.

  11. Check Sub-Switch Power Supply

    Check voltage between ground and affected sub-switch harness connector. See WIRING DIAGRAMS  . If battery exists, system is okay. Check for loose connections. If battery voltage does not exist, repair open in circuit between sub-switch and power window relay.
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