Midgate Ajar Indicator Malfunction
Midgate Ajar Indicator Malfunction
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 latch ajar switches provide a single input to the midgate control module. The switch signal circuit is supplied accessory voltage through a resistor and monitored by the midgate control module. When the midgate is opened both of the latch ajar switches close and the circuit is pulled low. The midgate control module provides an ajar signal to the body control module through the midgate ajar indicator signal circuit. The body control module supplies the signal circuit with accessory voltage through a resistor and monitors the voltage level. When the midgate is ajar the midgate control module will ground the ajar indicator signal circuit and the voltage monitored by the body control module will drop indicating the circuit is active.
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, observe the scan tool Rear Closure Ajar Sw parameter while opening and closing the midgate, the parameter should change from Active to Inactive.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the midgate window motor.
2. Ignition ON, verify the scan tool Rear Closure Ajar Sw parameter is Inactive.
• If not the specified value, test the signal circuit terminal 12 for a short to ground. If the circuit tests normal, replace the BCM.
3. Install a 3A fused jumper wire between the signal circuit terminal 12 and ground. Verify the scan tool Rear Closure Ajar Sw parameter is Inactive.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
4. Ignition OFF, connect the harness connector at the midgate window motor and disconnect the harness connector at the left midgate latch.
5. Ignition ON, verify the scan tool Rear Closure Ajar Sw parameter is Inactive.
• If not the specified value, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the midgate window motor.
6. Install a 3A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool Rear Closure Ajar Sw parameter is Active.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the midgate window motor.
7. Connect the harness connector at the left midgate latch and disconnect the harness connector at the right midgate latch.
8. Ignition OFF, 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.
9. Ignition ON, verify the scan tool Rear Closure Ajar Sw parameter is Inactive
• If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal, test or replace the left midgate latch.
10. Install a 3A fused jumper wire between the signal circuit terminal A and ground. Verify the scan tool Rear Closure Ajar Sw parameter is Active.
• If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the left midgate latch.
11. If all circuits test normal, test or replace the right midgate latch.
Component Testing
1. Ignition OFF, disconnect the harness connector at the appropriate midgate latch.
2. Test for infinite resistance between the signal terminal B and the ground terminal A with the switch in the open position.
• If not the specified value, replace the midgate latch.
3. Test for less than 2 ohms between the signal terminal B and the ground terminal A with the switch in the closed position.
• If greater than the specified range, replace the midgate latch.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Midgate Latch Replacement ()
* Midgate Window Regulator Module Motor Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM or IPC replacement, programming, and setup.