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Circuit/System Testing

Driver/Passenger Window Motor Malfunction

  1. Ignition 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. 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 M74 window motor.
    • If the test lamp illuminates 
  5. Test for 5-10 V between the serial data circuit terminal 4 and ground
    • If less than 5 V 
    1. Ignition OFF, disconnect the harness connector at the K9 body control module.
    2. Test for infinite resistance between the serial data 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 serial data circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance on the circuit.
      • If less than 2 Ω, replace the K9 body control module.
    • If greater than 10 V 
    1. Ignition OFF, disconnect the harness connector at the K9 body control module, ignition ON.
    2. Test for less than 1 V between the serial data circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 body control module.
    • If between 5-10 V 
  6. Test or replace the M74 window motor.

Driver Window Malfunction From Driver Window Switch

  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 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 4 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 S79D window switch-driver
    • If the test lamp illuminates 
  5. Test for 5-10 V between the serial data circuit terminal 5 and ground
    • If less than 5 V 
    1. Ignition OFF, disconnect the harness connector at the K9 body control module.
    2. Test for infinite resistance between the serial data 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 serial data circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance on the circuit.
      • If less than 2 Ω, replace the K9 body control module.
    • If greater than 10 V 
    1. Ignition OFF, disconnect the harness connector at the K9 body control module, ignition ON.
    2. Test for less than 1 V between the serial data signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 body control module.
    • If between 5-10 V 
  6. 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 
  7. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 1.
  8. Verify the scan tool Driver Window Main Control Down Switch parameter is Active
    • If not Active 
    1. Ignition OFF, 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 
  9. 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 
  10. Install a 3 A fused jumper wire between the signal circuit terminal 6 and the ground circuit terminal 1.
  11. Verify the scan tool Driver Window Main Control Up Switch parameter is Active
    • If not Active 
    1. Ignition OFF, disconnect the harness connector at the M74D window motor-driver, ignition ON.
    2. Test for less than 1 V between the signal circuit 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 
  12. 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 
  13. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 1.
  14. Verify the scan tool Driver Window Main Control Express Switch parameter is Active
    • If not Active 
    1. Ignition OFF, disconnect the harness connector at the M74D window motor-driver, ignition ON.
    2. Test for less than 1 V between the signal circuit 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 
  15. Test or replace the S79D window switch-driver.

Passenger Window Switch Inoperative

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S79P window switch-passenger. 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. Test or replace the S79P window switch-passenger.

Passenger Window Malfunction From Both Switches

  1. Ignition OFF, disconnect the harness connector at the S79P window switch-passenger.
  2. Disconnect the harness connector at the S79D window switch-driver, ignition ON.
  3. Verify the scan tool Passenger Window Switch at Door parameter is Inactive.
    • If the value is UP 
    1. Ignition OFF, disconnect the harness connector at the M74P window motor-passenger.
    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 M74P window motor-passenger.
    • If the value is Down 
    1. Ignition OFF, disconnect the harness connector at the M74P window motor-passenger.
    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 M74P window motor - passenger.
    • If Inactive 
  4. Install a 3 A fused jumper wire between the signal circuit terminal 7 and the ground circuit terminal 1.
  5. Verify the scan tool Passenger Window Switch at Door parameter is Down
    • If Inactive 
    1. Ignition OFF, disconnect the harness connector at the M74P window motor - passenger, 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 M74P window motor - passenger.
    • If Down 
  6. Install a 3 A fused jumper wire between the signal circuit terminal 8 and ground circuit terminal 1.
  7. Verify the scan tool Passenger Window Switch at Door parameter is Up
    • If Inactive 
    1. Ignition OFF, disconnect the harness connector at the M74P window motor - passenger, 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 M74P window motor - passenger.
    • If Down 
  8. Test for greater than 10 V between the signal circuit terminal 6 and ground circuit terminal 1.
    • If less than 10 V 
    1. Ignition OFF, disconnect the harness connector at the M74P window motor - passenger.
    2. Test for infinite resistance between the signal 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 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 
  9. Ignition OFF, connect the harness connector at the S79P window switch - passenger. Ignition ON
  10. Verify the scan tool Passenger Window Switch at Door parameter changes between Inactive and Up, Express Up, Down, and Express Down when pressing and pulling the S79P window switch-passenger.
    • If any parameter does not change 

      Test or replace the S79P window switch-passenger.

    • If all the parameters change 
  11. Ignition OFF, connect the harness connector at the S79D window switch - driver. Ignition ON
  12. Verify the scan tool Passenger Window Switch at Door parameter changes between Inactive and Up, Express Up, Down, and Express Down when pressing and pulling the appropriate switch on the S79D window switch-driver.
    • If any parameter does not change 

      Test or replace the S79D window switch-driver.

    • If all the parameters change 
  13. Test or replace the M74P window motor-passenger.
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