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Home >> Buick >> 2016 >> Encore Base, AWD >> Repair and Diagnosis >> Body & Frame >> Windows >> Fixed And MOVEABLE Window System >> Diagnostic Information and Procedures >> Power Windows Malfunction (AXG, A66, A33) >> Circuit/System Testing

Circuit/System Testing

Driver Window Motor Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the M74D Window Motor-Driver. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 1 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the B+ circuit terminal 2 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the M74D Window Motor-Driver.
    • If the test lamp illuminates 
  5. Replace the M74D Window Motor-Driver.

Driver Window Switch Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S79D Window Switch-Driver. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 11 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Verify the scan tool Driver Window Main Control Down Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
    2. Test for infinite resistance between the signal circuit terminal 8 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the M74D Window Motor-Driver.
    • If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 8 and the ground circuit terminal 11.
  6. Verify the scan tool Driver Window Main Control Down Switch parameter is Active
    • If not Active 
    1. Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 8 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the M74D Window Motor-Driver.
    • If Active 
  7. Verify the scan tool Driver Window Main Control Up Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
    2. Test for infinite resistance between the signal circuit terminal 9 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the M74D Window Motor-Driver.
    • If Inactive 
  8. Install a 3 A fused jumper wire between the signal circuit terminal 9 and the ground circuit terminal 11.
  9. Verify the scan tool Driver Window Main Control Up Switch parameter is Active
    • If not Active 
    1. Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 9 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the M74D Window Motor-Driver.
    • If Active 
  10. Verify the scan tool Driver Window Main Control Express Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver.
    2. Test for infinite resistance between the signal circuit terminal 7 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the M74D Window Motor-Driver.
    • If Inactive 
  11. Install a 3 A fused jumper wire between the signal circuit terminal 7 and the ground circuit terminal 11.
  12. Verify the scan tool Driver Window Main Control Express Switch parameter is Active
    • If not Active 
    1. Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 7 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the M74D Window Motor-Driver.
    • If Active 
  13. Test or replace the S79D Window Switch-Driver.

Passenger or Rear Window Motor Inoperative

  1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver. Ignition ON
  2. Verify a test lamp illuminates between the ignition circuit terminal listed below and ground:
    • Ignition circuit terminal 6
    • Ignition circuit terminal 7
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the control circuit terminals listed below and ground:
      • Control circuit terminal 1
      • Control circuit terminal 2
      • Control circuit terminal 3
      • Control circuit terminal 4
      • Control circuit terminal 5
      • Control circuit terminal 8
      • Control circuit terminal 9
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the S79D Window Switch-Driver.
    • If the test lamp illuminates 
  3. Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79D Window Switch-Driver and disconnect the harness connector at the appropriate passenger or rear S79 Window Switch. It may take up to 2 minutes for all vehicle systems to power down.
  4. Test for less than 10 Ω between the control circuit terminal 3 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the S79D Window Switch-Driver.
    • If less than 10 Ω 
  5. Test for less than 10 Ω between the control circuit terminal 6 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the S79D Window Switch-Driver.
    • If less than 10 Ω 
  6. Connect a test lamp between the control circuit terminal 3 and control circuit terminal 6, ignition ON.
  7. Verify the test lamp turns ON when commanding the UP and DOWN functions with the S79D Window Switch-Driver.
    • If the test lamp remains OFF during either of the commands 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79D Window Switch-Driver.
    2. Test for infinite resistance between each control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the S79D Window Switch-Driver.
    • If the test lamp turns ON during each of the commands 
  8. Ignition OFF and all vehicle systems OFF, connect the harness connector at the S79 Window Switch and disconnect the harness connector at the M74 Window Motor. It may take up to 2 minutes for all vehicle systems to power down.
  9. Test for less than 10 Ω between the control circuit terminal 1 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the S79 Window Switch.
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the S79 Window Switch.
    • If less than 10 Ω 
  10. Test for less than 10 Ω between the control circuit terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the S79 Window Switch
    2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the S79 Window Switch.
    • If less than 10 Ω 
  11. Connect a test lamp between the control circuit terminal 1 and control circuit terminal 2, ignition ON.
  12. Verify the test lamp turns ON when commanding the UP and DOWN functions with the S79 Window Switch.
    • If the test lamp remains OFF during either of the commands 
    1. Ignition OFF, remove the test lamp, disconnect the harness connector at the S79 Window Switch.
    2. Test for infinite resistance between each control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, test or replace the S79 Window Switch.
    • If the test lamp turns ON during each of the commands 
  13. Test or replace the M74 Window Motor

Passenger Window Switch Inoperative

  1. Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger, ignition ON
  2. Verify a test lamp illuminates between the ignition circuit terminal 5 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp illuminates 
  3. Test or replace the S79P Window Switch-Passenger.

Rear Window Switch Inoperative

  1. Ignition OFF, disconnect the harness connector at the appropriate S79 Window Switch-Rear, ignition ON
  2. Connect a test lamp between the control circuit terminal 5 and ground.
  3. Verify the test lamp turns ON and OFF when pressing the window lockout switch on the S79D Window Switch-Driver.
    • If the test lamp is always OFF 
    1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the S79D Window Switch-Driver.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the harness connector at the S79D Window Switch-Driver, ignition ON.
    2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, test or replace the S79D Window Switch-Driver.
    • If the test lamp turns ON and OFF 
  4. Test or replace the S79 Window Switch-Rear.
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