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Circuit/System Testing

Driver Window Motor Malfunction

  1. Vehicle 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. 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 M74D window motor-driver.
    • 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. Vehicle 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. Vehicle OFF, disconnect the harness connector at the K9 body control module, Vehicle in Service Mode.
    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 M74D window motor-driver.

Driver Window Switch Malfunction

  1. Vehicle 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. Test for 5-10 V between the serial data circuit terminal 5 and ground
    • If less than 5 V 
    1. Vehicle 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. Vehicle OFF, disconnect the harness connector at the K9 body control module, Vehicle in Service Mode.
    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. 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 
  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. Vehicle OFF, 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 
  9. 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 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. Vehicle OFF, 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 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. Vehicle 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. Vehicle OFF, 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 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 Power Window Inoperative

  1. Vehicle OFF, 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.
  2. Test for less than 10 Ω between the ground circuit terminal listed below and ground:
    • S79P window switch-passenger - ground circuit terminal 1
    • S79LR window switch-left rear - ground circuit terminal 5
    • S79RR window switch-right rear - ground circuit terminal 5
    • 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 listed below and ground:
    • S79P window switch-passenger - B+ circuit terminal 4
    • S79LR window switch-left rear - B+ circuit terminal 8
    • S79RR window switch-right rear - B+ circuit terminal 8
    • 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 S79 window switch
    • If the test lamp illuminates 
  5. Test for 5-10 V between the serial data circuit terminal listed below and ground
    • S79P window switch-passenger - serial data circuit terminal 5
    • S79LR window switch-left rear - serial data circuit terminal 1
    • S79RR window switch-right rear - serial data circuit terminal 1
    • If less than 5 V 
    1. Vehicle 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. Vehicle OFF, disconnect the harness connector at the K9 body control module, Vehicle in Service Mode.
    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. Vehicle OFF, connect the harness connector at the S79 window switch and disconnect the harness connector at the M74 window motor.
  7. Test for less than 5 Ω between the control circuit terminal A and ground.
    • If 5 Ω or greater 
    1. Vehicle 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, replace the S79 window switch.
    • If less than 5 Ω 
  8. Test for less than 5 Ω between the control circuit terminal B and ground.
    • If 5 Ω or greater 
    1. Vehicle 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, replace the S79 window switch.
    • If less than 5 Ω 
  9. Connect a test lamp between control circuit terminal A and control circuit terminal B, Vehicle in Service Mode.
  10. Verify the test lamp turns ON when commanding the UP and DOWN states with the S79 window switch.
    • If the test lamp remains OFF during either of the commands 
    1. Vehicle OFF, 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, replace the S79 window switch.
    • If the test lamp turns ON during each of the commands 
  11. Test or replace the M74 window motor.
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