Circuit/System Testing

Driver Window Malfunction (Except RPO AXG)

1. Ignition OFF, disconnect the X1 harness connector at the S79D window switch-driver.
2. Test for less than 10 Ω between the ground circuit terminal B 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 E 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 X1 harness connector at the S79D window switch-driver and disconnect the harness connector at the M74D window motor-driver.
5. Connect a test lamp between the control circuit terminal A and ground.
6. Ignition ON, command the driver window DOWN by using the S79D window switch-driver. The test lamp should illuminate when commanding the DOWN state.
   • 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.
   • 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.
7. Connect a test lamp between the control circuit terminal B and ground.
8. Command the driver window UP by using the S79D window switch-driver. The test lamp should illuminate when commanding the UP state.
   • 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.
   • 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.
9. If all circuits tests normal, test or replace the M74D window motor-driver.

Driver Window Malfunction (RPO AXG)

1. Ignition OFF, disconnect the X1 harness connector at the S79D window switch-driver.
2. Test for less than 10 Ω between the ground circuit terminal B 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 E and ground.
   • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Ignition OFF, connect the X1 harness connector at the S79D window switch-driver and disconnect the harness connector at the M74D window motor-driver.
5. Test for less than 10 Ω between the ground circuit terminal 4 and ground.
   • If greater than the specified range, test the ground circuit for an open/high resistance.
6. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 6 and ground.
   • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ fuse is open, replace the M74D window motor-driver.
7. Verify that a test lamp illuminates between the ignition circuit terminal 3 and ground.
   • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
8. Connect a test lamp between the control circuit terminal 1 and ground.
9. Ignition ON, command the driver door window DOWN by using the S79D window switch-driver. The test lamp should illuminate when commanding the DOWN state.
   • 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.
   • 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.
10. Connect a test lamp between the control circuit terminal 2 and ground.
11. Command the driver door window UP by using the S79D window switch-driver. The test lamp should illuminate when commanding the UP state.
    • 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.
    • 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.
12. If all circuits tests normal, test or replace the M74D window motor-driver.

Front Passenger Window 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 igniton circuit terminal A and ground.
   • If the test lamp does not illuminate, test the ignition circuit for an open/high resistance
3. Ignition OFF, test for less than 5 Ω between the control circuit terminal H 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 S79D window switch-driver.
4. Test for less than 5 Ω between the control circuit terminal D 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 S79D window switch-driver.
5. Connect a test lamp between the control circuit terminal D and control circuit terminal H.
6. Ignition ON, command the front passenger door window UP and DOWN by using the right front switch on 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 control circuits for a short to ground. If the circuits test normal, test or replace the S79D window switch-driver.
7. Ignition OFF, connect the harness connector at the S79P window switch-passenger and disconnect the harness connector at the M74P window motor-passenger.
8. Test for less than 5 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 5 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 front passenger door 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 Malfunction

1. Ignition OFF, disconnect the harness connector at the appropriate rear S79 window switch.
NOTE:

Verify the rear S79 window switch is enabled by checking the lockout switch on the S79D window switch-driver.

2. Ignition ON, verify that a test lamp illuminates between the control circuit terminal A and ground.
   • If the test lamp does not illuminate, 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.
3. Ignition OFF, test for less than 5 Ω between the control circuit terminal D 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 S79D window switch-driver.
4. Test for less than 5 Ω between the control circuit terminal H 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 S79D window switch-driver.
5. Connect a test lamp between the control circuit terminal D and control circuit terminal H.
6. Ignition ON, command the rear window UP and DOWN using the appropriate switch on 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 control circuits for a short to ground. If the circuits test normal, test or replace the S79D window switch-driver.
7. Ignition OFF, connect the harness connector at the rear S79 window switch and disconnect the harness connector at the rear M74 window motor.
8. Test for less than 5 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.
9. Test for less than 5 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.
10. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
11. Ignition ON, command the rear window UP and DOWN using the rear S79 window switc. 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 control circuits for a short to ground. If the circuits test normal, test or replace the rear S79 window switch.
12. If all circuits test normal, test or replace the rear M74 window motor.

Lockout 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 A and ground.
3. 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.