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Circuit/System Testing

Driver Window Malfunction

  1. Ignition OFF, disconnect the X2 harness connector at the S79D window switch-driver.
  2. Test for less than 1 Ω between the ground circuit terminal A and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal H and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Verify that a test lamp illuminates between the ignition circuit terminal G and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance
  5. Connect the X2 harness connector at the S79D window switch-driver. Disconnect the harness connector at the M74D window motor-driver.
  6. Test for less than 1 Ω between the control circuit terminal listed below and ground:
    • Terminal A
    • Terminal B
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the S79D window switch-driver.
  7. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
  8. Command the driver window UP and DOWN by using the driver window switch. The test lamp should illuminate when commanding the UP and DOWN states.
    • If the test lamp remains OFF during either of the commands, test either control circuit for a short to ground. If the circuits test normal, replace the S79D window switch-driver.
  9. If all circuits test normal, test or replace the M74D window motor-driver.

Front Passenger Window Malfunction

  1. Ignition OFF, disconnect the harness connector at the S79P window switch-passenger.
  2. Test for less than 1 Ω between the ground circuit terminal F and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal G and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Verify that a test lamp illuminates between the ignition circuit terminal D and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  5. Connect a test lamp between the signal circuit terminal C and ground.
  6. Command the passenger window DOWN using the right front window switch on the S79D window switch-driver, the test lamp should illuminate during the DOWN command.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the S79D window switch-driver.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the S79D window switch-driver.
  7. Connect a test lamp between the signal circuit terminal A and ground.
  8. Command the passenger window UP using the right front window switch on the S79D window switch-driver, the test lamp should illuminate during the UP command.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the S79D window switch-driver.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the S79D window switch-driver.
  9. Ignition OFF, connect the harness connector S79P window switch-passenger and disconnect the harness connector at the M74P window motor-passenger.
  10. Test for less than 1 Ω between the control circuit terminal listed below and ground:
    • Terminal A
    • Terminal B
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the S79P window switch-passenger.
  11. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
  12. Command the passenger window UP and DOWN by using the S79P window switch-passenger. The test lamp should illuminate when commanding the UP and DOWN states.
    • If the test lamp remains OFF during either of the commands, test either control circuit for a short to ground. If the circuits test normal, replace the S79P window switch-passenger.
  13. If all circuits test normal, test or replace the M74P window motor-passenger.

Rear Window Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate rear S79 window switch.
  2. Test for less than 1 Ω between the ground circuit terminal F and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal G and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
    4. NOTE:

    Verify the rear S79 window switch is enabled by checking the lockout switch on the S79D window switch-driver.

  4. Verify that a test lamp illuminates between the control circuit terminal D and ground.
    • If the test lamp does not illuminate, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the S79D window switch-driver.
  5. Connect a test lamp between the signal circuit terminal C and ground.
  6. Command the rear window DOWN using the appropriate window switch on the driver master control, the test lamp should illuminate during the DOWN command.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the S79D window switch-driver.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the S79D window switch-driver.
  7. Connect a test lamp between the signal circuit terminal A and ground.
  8. Command the rear window UP using the appropriate switch on the S79D window switch-driver, the test lamp should illuminate during the UP command.
    • If the test lamp is always OFF, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the S79D window switch-driver.
    • If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the S79D window switch-driver.
  9. Ignition OFF, connect the harness connector at rear S79 window switch and disconnect the harness connector at the rear M74 window motor.
  10. Test for less than 1 Ω between the control circuit terminal listed below and ground.
    • Terminal A
    • Terminal B
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the rear S79 window switch.
  11. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
  12. Command the rear window UP and DOWN by using the rear S79 window switch. The test lamp should illuminate when commanding the UP and DOWN states.
    • If the test lamp remains OFF during either of the commands, test either control circuit for a short to ground. If the circuits test normal, replace the rear S79 window switch.
  13. If all circuits test normal, test or replace the rear M74 window motor.

Rear Window Lockout Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate rear S79 window switch.
  2. Connect a test lamp between the control circuit terminal D and ground.
  3. Command the rear window lockout ON and OFF by pressing and depressing the lockout switch on the S79D window switch-driver. The test lamp should turn ON and OFF when changing between the commanded states
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the S79D window switch-driver.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the S79D window switch-driver.
  4. If all circuits test normal, replace the rear S79 window switch.
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