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Circuit/System Testing

Driver Window Motor Malfunction

  1. Ignition OFF, disconnect the harness connector at the M74D window motor-driver.
  2. Test for less than 10 Ω between the ground circuit terminal 1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Test for 5-10 V between the serial data circuit terminal 4 and ground.
    • If greater than the specified range, test the serial data circuit for a short to voltage.
    • If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance.
  5. If all circuits test normal, test or replace the M74D window motor-driver.

Driver Power Window Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the S79D window switch-driver.
  2. Test for less than 5 Ω between the ground circuit terminal 11 and ground.
    • If greater than the specified range, test the ground circuit for and open/high resistance.
  3. Ignition ON, verify that the scan tool Driver Window Main Control Down Switch parameter is Inactive.
    • If not the specified value, test the control circuit terminal 8 for a short to ground. If the circuit tests normal, test or replace the M74D window motor-driver.
  4. Connect a 5 A fused jumper wire between the control circuit terminal 8 and ground, verify that the scan tool Driver Window Main Control Down Switch parameter is Active.
    • If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the M74D window motor-driver.
  5. Verify that the scan tool Driver Window Main Control Up Switch parameter is Inactive.
    • If not the specified value, test the control circuit terminal 9 for a short to ground. If the circuit tests normal, test or replace the M74D window motor-driver.
  6. Connect a 5 A fused jumper wire between the control circuit terminal 9 and ground, verify that the scan tool Driver Window Main Control Up Switch parameter is Active.
    • If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the M74D window motor-driver.
  7. Verify that the scan tool Driver Window Main Control Express Switch parameter is Inactive.
    • If not the specified value, test the control circuit terminals listed below for a short to ground. If the circuit tests normal, test or replace the M74D window motor-driver.
    • Control terminal 7
    • Control terminal 10
  8. Connect a 5 A fused jumper wire between the control circuit terminal listed below and ground, verify that the scan tool Driver Window Main Control Express Switch parameter is Active.
    • Control terminal 7
    • Control terminal 10
    • If not the specified value, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the M74D window motor-driver.
  9. If all circuits test normal, 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.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 5 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  3. If all circuits test normal, test or replace the S79P window switch-passenger.

Passenger Window Inoperative

  1. Ignition OFF, disconnect the harness connector at the S79P window switch-passenger.
  2. Test for less than 10 Ω between the signal circuit terminal 3 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the S79D window switch-driver.
  3. Test for less than 10 Ω between the signal circuit terminal 6 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the S79D window switch-driver.
  4. Connect a test lamp between the signal circuit terminal 3 and signal circuit terminal 6.
  5. Ignition ON, command the passenger window UP and DOWN using the S79D window switch-driver. The test lamp should illuminate when commanding the UP and DOWN states.
    • If the test lamp does not illuminate during either of the commands, test either signal circuit for a short to ground. If the circuits test normal, test or replace the S79D window switch-driver.
  6. Ignition OFF, connect the harness connector at the S79P window switch-passenger.
  7. Disconnect the harness connector at the M74P window motor-passenger.
  8. Test for less than 10 Ω between the control circuit terminal A and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the S79P window switch-passenger.
  9. Test for less than 10 Ω between the control circuit terminal B and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the S79P window switch-passenger.
  10. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
  11. Ignition ON, command the passenger window UP and DOWN using the S79P window switch-passenger. The test lamp should illuminate when commanding the UP and DOWN states.
    • If the test lamp does not illuminate during either of the commands, test either control circuit for a short to ground. If the circuits test normal, test or replace the S79P window switch-passenger.
  12. If all circuits test normal, test or replace the M74P window motor-passenger.

Rear Window Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate rear S79 window switch.
  2. Connect a test lamp between the control circuit terminal 5 and ground.
  3. Ignition ON, command the rear window lockout ON and OFF by pressing and depressing the lockout switch on the S79D window switch-driver. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the S79D window switch-driver.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the S79D window switch-driver.
  4. If all circuits test normal, test or replace the rear S79 window switch.

Rear Window Inoperative

  1. Ignition OFF, disconnect the harness connector at the S79D window switch-driver.
  2. Test for less than 10 Ω between the ground circuit terminal 11 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 6 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  4. Ignition OFF, connect the harness connector at the S79D window switch-driver.
  5. Disconnect the harness connector at the appropriate rear S74 window switch.
  6. Test for less than 10 Ω between the signal circuit terminal 3 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the S79D window switch-driver.
  7. Test for less than 10 Ω between the signal circuit terminal 6 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the S79D window switch-driver.
  8. Connect a test lamp between the signal circuit terminal 3 and the signal circuit terminal 6.
  9. Ignition ON, command the rear window UP and DOWN by using the S79D window switch-driver. The test lamp should illuminate when commanding the UP and DOWN states.
    • If the test lamp does not illuminate during either of the commands, test both signal circuits for a short to ground. If the circuits test normal, test or replace the S79D window switch-driver.
  10. Ignition OFF, connect the harness connector at the rear S79 window switch.
  11. Disconnect the harness connector at the rear M74 window motor.
  12. Test for less than 10 Ω between the control circuit terminal A and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the rear S79 window switch.
  13. Test for less than 10 Ω between the control circuit terminal B and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the rear S79 window switch.
  14. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
  15. Ignition ON, command the rear window UP and DOWN using the rear S79 window switch. The test lamp should illuminate when commanding the UP and DOWN states.
    • If the test lamp does not illuminate during either of the commands, test either control circuit for a short to ground. If the circuits test normal, test or replace the rear S79 window switch.
  16. If all circuits test normal, test or replace the rear M74 window motor.
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