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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Body & Frame >> Windows >> Fixed And MOVEABLE Window System >> Diagnostic Information and Procedures >> DTC B316B, B317A, B318A, or B319A: Window Switch >> Circuit/System Testing

Circuit/System Testing

Driver Window Switch Malfunction

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

Passenger Window Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the S79P Window Switch-Passenger, ignition ON
  2. Verify the appropriate scan tool Passenger Window Switch at Door parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the harness connector at the M74P Window Motor-Passenger.
    2. Test for infinite resistance between the signal circuit terminal listed below and ground:
      • S79P Window Switch-Passenger - signal circuit terminal 7
      • S79P Window Switch-Passenger - signal circuit terminal 8
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the M74P Window Motor-Passenger.
    • If Inactive 
  3. Install a 3A fused jumper wire between the signal circuit terminal 8 and ground:
  4. Verify the scan tool Passenger Window Switch at Door parameter is Up
    • If Inactive 
    1. Ignition OFF, remove the 3A fused jumper wire, disconnect the harness connector at the M74P Window Motor-Passenger, ignition ON.
    2. Test for less than 1V between the circuit terminal and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V
    3. Ignition OFF, test for less than 2Ω in the signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the M74P Window Motor-Passenger.
    • If Up 
  5. Install a 3A fused jumper wire between the signal circuit terminal 7 and ground.
  6. Verify the scan tool Passenger Window Switch at Door parameter is Down
    • If Inactive 
    1. Ignition OFF, remove the 3A fused jumper wire, disconnect the harness connector at the M74P Window Motor-Passenger, ignition ON.
    2. Test for less than 1V between the signal circuit terminal and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V
    3. Ignition OFF, test for less than 2Ω in the signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the M74P Window Motor-Passenger.
    • If Down 
  7. Test for greater than 10V between the signal circuit terminal 6 and ground
    • If less than 10V 
    1. Ignition OFF, disconnect the harness connector at the M74P Window Motor-Passenger.
    2. Test for infinite resistance between the signal circuit 5 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2Ω in the signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance on the circuit.
      • If less than 2Ω, replace the M74P Window Motor-Passenger.
    • If greater than 10V 
  8. Test or replace the S79P Window Switch-Passenger.
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