The midgate power window is controlled by the midgate module using inputs from the midgate window switch and the driver door switch (DDS). The window switch circuits are referenced from ground by the midgate module and are determined to be active when high. The midgate module also uses inputs from 2 Hall effect sensors located on the motor. The hall sensors enable the module to monitor the window position and motor speed.

The midgate module monitors the voltage level on the midgate ajar signal circuit, when the midgate is fully closed, the left and right midgate ajar switches are closed causing the ajar signal voltage to be near zero. The midgate module detects the low voltage level on the ajar signal circuit and will allow normal operation of the midgate window. If either the left or right midgate switch is open, as is an ajar condition, the ajar signal will be at or near B+ voltage and the midgate module will prohibit midgate window operation.

Verify the midgate is fully closed, an ajar condition on the left or right midgate latches will not allow for midgate window operation.

Some midgate power window system faults will cause the midgate module to operate the power window in the Error/Jog mode while commanding the window UP or DOWN. The system will go into the Error/Jog mode whenever the midgate module is unable to determine the position of the glass due to memory corruption or Hall sensor failures. One of the switches stuck in the UP position can also cause the Error/Jog mode to occur.

Schematic Reference

Moveable Window Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

Ignition ON, command the midgate window UP and DOWN by using the midgate window switch and the global window switch. The midgate window should perform the UP and DOWN command from both switches.

Midgate Window Switch Malfunction

1. Ignition OFF, disconnect the harness connector at the midgate window switch.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal A and ground.

⇒	If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

3. Ignition OFF, connect the harness connector at the midgate window switch and disconnect the harness connector at the midgate window motor.
4. Connect a test lamp between the signal circuit terminal 2 and ground.
5. Ignition ON, command the midgate window UP by using the midgate window switch. The test lamp should illuminate during the UP command.

⇒	If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the midgate window switch.

⇒	If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the midgate window switch.

6. Connect a test lamp between the signal circuit terminal 3 and ground.
7. Command the midgate window DOWN by using the midgate window switch. The test lamp should illuminate during the DOWN command.

⇒	If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the midgate window switch.

⇒	If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, test or replace the midgate window switch.

8. If all circuits test normal, replace the midgate window motor.

Midgate Window Malfunction

1. Ignition OFF, disconnect the harness connector at the midgate window motor.
2. Test for less than 1 ohm between ground circuit terminals listed below and ground:

•	Terminal 6

•	Terminal 16

⇒	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 listed below and ground:

•	Terminal 10

•	Terminal 20

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. Connect a test lamp between the signal circuit terminal 19 and ground.
5. Command the midgate window UP using the global window switch. The test lamp should illuminate during the UP command.

⇒	If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the DDS.

⇒	If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DDS.

6. Ignition OFF, disconnect the X5 harness connector at the DDS.
7. Connect a test lamp between the signal circuit terminal 3 and ground.
8. Ignition ON, command the midgate window DOWN using the midgate window switch. The test lamp should illuminate during the DOWN command.

⇒	If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the midgate window switch.

⇒	If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the midgate window switch.

9. Ignition OFF, connect the X5 harness connector at the DDS.
10. Ignition ON, command the midgate window DOWN using the global window switch. The test lamp should illuminate during the DOWN command.

⇒	If the test lamp is always OFF, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the DDS.

⇒	If the test lamp is always ON, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DDS.

Note: Verify the midgate is completely closed.

11. Ignition OFF, connect the harness connector at the midgate window motor and disconnect the harness connector at the right midgate latch.
12. Ignition ON, test for greater than 9V between the signal circuit terminal B and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the midgate module.

13. Ignition OFF, connect the harness connector at the right midgate latch and disconnect the harness connector at the left midgate latch.
14. Test for less than 1 ohm between the ground circuit terminal B and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

15. Ignition ON, test for greater than 9V between the signal circuit terminal A and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the right midgate latch.

16. Test for less than 5 ohms between the signal terminal A and the ground terminal B at the left midgate latch.

⇒	If greater than the specified range, replace the left midgate latch.

17. If all the circuits test normal replace the midgate module.

Midgate Window Switch

1. Ignition OFF, disconnect the harness connector at the midgate window switch.
2. Test for infinite resistance between the signal terminals B and C and the ignition terminal A with the switch in the INACTIVE position.

⇒	If less than the specified value, replace the midgate window switch.

3. Test for less than 2 ohms between the signal terminal C and the ignition terminal A with the switch in the UP position.

⇒	If greater than the specified range, replace the midgate window switch.

4. Test for less than 2 ohms between the signal terminal B and the ignition terminal A with the switch in the DOWN position.

⇒	If greater than the specified range, replace the midgate window switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.