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Circuit/System Testing

Driver Power Window Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the DDM.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, connect the X1 harness connector at the DDM.
  4. Ignition ON, observe the scan tool Driver Window Switch parameters while using the driver power window switch. The parameter should change between Off, Up, Down, and Express Down.
    • If the value does not change, replace the DDM.
  5. Ignition OFF, disconnect the harness connector at the driver window motor.
  6. Test for less than 1 ohm between the control circuit terminal A and ground.
    • 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 DDM.
  7. Test for less than 1 ohm between the control circuit terminal B and ground.
    • 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 DDM.
  8. Connect a test lamp between control circuit terminal A and control circuit terminal B.
  9. Ignition ON, 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 is always OFF during either of the commands, test either control circuit for a short to ground. If the circuits test normal, replace the DDM.
  10. If all circuits test normal, test or replace the driver window motor.

Passenger Power Window Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the PDM.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Ignition OFF, connect the X1 harness connector at the PDM.
  4. Ignition ON, observe the scan tool Passenger Window Switch parameters while using the passenger power window switch. The parameter should change between Off, Up, Down, and Express Down.
    • If the value does not change, replace the PDM.
  5. Ignition OFF, disconnect the harness connector at the passenger window motor.
  6. Test for less than 1 ohm between the control circuit terminal A and ground.
    • 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 PDM.
  7. Test for less than 1 ohm between the control circuit terminal B and ground.
    • 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 PDM.
  8. Connect a test lamp between control circuit terminal A and control circuit terminal B.
  9. Ignition ON, command the passenger window UP and DOWN by using the passenger window switch. The test lamp should illuminate when commanding the UP and DOWN states.
    • If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground. If the circuits test normal, replace the PDM.
  10. If all circuits test normal, test or replace the passenger window motor.

Rear Window Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
  2. Test for less than 1 ohm 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 the scan tool LR Window Enable Cmd. and RR Window Enable Cmd. parameters are On.
    • If not the specified value, press the window lockout switch on the driver master control.
  5. Test for greater than 9 volts between the control circuit terminal D and ground.
    • If less than the specified range, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
  6. Test for greater than 9 volts between the signal circuit terminal C and ground while commanding the Rear Window DOWN with a scan tool.
    • If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
  7. Test for greater than 9 volts between the signal circuit terminal A and ground while commanding the Rear Window UP with a scan tool.
    • If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
  8. Ignition OFF, connect the rear window switch and disconnect the harness connector at the rear window motor.
  9. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
  10. Ignition ON, command the rear window UP and DOWN by using the rear window switch. The test lamp should illuminate when commanding the UP and DOWN states.
    • If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground or open/high resistance. If the circuits test normal, replace the rear window switch
    • If the test lamp is always ON, test either control circuit for a short to voltage. If the circuits test normal, replace the rear window switch.
  11. If all circuits test normal, test or replace the rear window motor.
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