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Circuit/System Testing

Driver/Passenger Window Motor Malfunction

  1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate driver or passenger M74 Window Motor. 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. Vehicle 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. Vehicle in Service Mode.
  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. Vehicle 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. Vehicle 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 M74 Window Motor.
    • If the test lamp illuminates 
  5. Test or replace the M74 Window Motor.

Driver Window Switch Malfunction

  1. Vehicle 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 1 and ground.
    • If 10 Ω or greater 
    1. Vehicle 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. Vehicle in Service Mode.
  4. Verify a test lamp illuminates between the B+ circuit terminal 4 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Vehicle 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. Vehicle 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 S79D Window Switch-Driver.
    • If the test lamp illuminates 
  5. Verify the scan tool Driver Window Main Control Down Switch parameter is Inactive.
    • If not Inactive 
    1. Vehicle 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 
  6. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 1.
  7. Verify the scan tool Driver Window Main Control Down Switch parameter is Active
    • If not Active 
    1. Vehicle OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, Vehicle in Service Mode.
    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 
  8. Verify the scan tool Driver Window Main Control Up Switch parameter is Inactive.
    • If not Inactive 
    1. Vehicle 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 
  9. Install a 3 A fused jumper wire between the signal circuit terminal 6 and the ground circuit terminal 1.
  10. Verify the scan tool Driver Window Main Control Up Switch parameter is Active
    • If not Active 
    1. Vehicle OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, Vehicle in Service Mode.
    2. Test for less than 1 V between the signal circuit 3 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 
  11. Verify the scan tool Driver Window Main Control Express Switch parameter is Inactive.
    • If not Inactive 
    1. Vehicle OFF, disconnect the harness connector at the M74D Window Motor-Driver.
    2. Test for infinite resistance between the signal circuit terminal 5 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 
  12. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 1.
  13. Verify the scan tool Driver Window Main Control Express Switch parameter is Active
    • If not Active 
    1. Vehicle OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, Vehicle in Service Mode.
    2. Test for less than 1 V between the signal circuit 5 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 
  14. Test or replace the S79D Window Switch-Driver.

Passenger Window Switch Malfunction

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