Midgate Latch Release Inoperative
Midgate Latch Release Inoperative
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The midgate latch release switches are a single input to the midgate window motor. The latch release switch signal circuit is referenced from battery voltage from the midgate window motor. When a latch release switch is pressed, the switch contacts close the signal circuit to ground. When the midgate window motor receives an active release switch signal, battery voltage is applied to the midgate latches through the midgate latch control circuit.
Diagnostic Aids
Before testing can be performed, the midgate must be opened. Refer to Opening the Midgate Without Electrical Power () for the appropriate procedure.
Reference Information
Schematic Reference
Release Systems Schematics (Release Systems Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Midgate Description and Operation ()
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Ignition ON, midgate window down, command the midgate to UNLATCH by using the left and right midgate latch switches. The midgate should perform the UNLATCH function from both switches.
If a midgate latch switch is inoperative, refer to Midgate Latch Switch Malfunction.
If the midgate does not completely UNLATCH, refer to Midgate Latch Malfunction.
If the midgate latch is inoperative from both midgate latch switches, refer to Midgate Release Inoperative.
Circuit/System Testing
Midgate Latch Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate midgate latch switch.
2. 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.
3. Ignition ON, test for greater than 9 volts between the signal circuit terminal A and ground.
• If less than the specified range, test the signal circuit for an open/high resistance.
4. If all circuits test normal, test or replace the midgate latch switch.
Midgate Latch Circuit Test
1. Ignition OFF, disconnect the harness connector at the appropriate midgate latch.
2. Test for less than 1 ohm between the ground circuit terminal E and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the control circuit terminal D and ground.
4. Ignition ON, command the midgate to UNLATCH by pressing the midgate latch switch, the test lamp should illuminate during the UNLATCH command.
• If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance.
5. If all circuits test normal, test or replace the midgate latch.
Midgate Release Inoperative
1. Ignition OFF, disconnect the harness connector at the midgate window motor.
2. Connect a test lamp between the signal circuit terminal 5 and B+.
3. Command the midgate to UNLATCH by pressing each midgate latch switch, the test lamp should illuminate during the UNLATCH command.
• If the test lamp is always OFF, test the signal circuit for a short to voltage or an open/high resistance.
• If the test lamp is always ON, test the signal circuit for a short to ground. If the circuit tests normal, replace the appropriate midgate latch switch.
4. Verify that a test lamp does not illuminate between the control circuit terminal 4 and ground.
• If a test lamp illuminates, test the control circuit for a short to voltage.
5. Momentarily install a 25A fused jumper wire between the control circuit terminal 4 and B+. Verify both midgate latches activate.
• If both midgate latches are inoperative, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate midgate latch.
6. If all circuits test normal, replace the midgate window motor.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Midgate Latch Replacement ()
* Midgate Latch Switch Replacement ()
* Midgate Window Regulator Module Motor Replacement (Service and Repair)