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Liftgate Release Inoperative (Non Panel Van)



LIFTGATE RELEASE INOPERATIVE (NON PANEL VAN)

DIAGNOSTIC INSTRUCTIONS
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.




DIAGNOSTIC FAULT INFORMATION

CIRCUIT/SYSTEM DESCRIPTION
The liftgate can be released by pressing the liftgate touchpad located in the handle above the license plate. All doors must be unlocked, the transaxle must be in park or a vehicle with a manual transaxle, the vehicle must be stationary for the liftgate to release.

Pressing the liftgate release switch closes a contact providing a ground for the liftgate release switch signal circuit. The body control module (BCM) will detect the voltage drop and command voltage to be supplied to the liftgate release relay control circuit thus energizing the L/GATE RELSE Relay which provides voltage to the Release Actuator releasing the liftgate.

CIRCUIT/SYSTEM VERIFICATION
1. Ignition ON, observe the Liftgate Release Sw parameter while pressing the Liftgate Release Switch. The reading should change between Active and Inactive.
- If the reading does not change between Active and Inactive, refer to Liftgate Release Switch Malfunction.
2. Observe the Liftgate Release Solenoid Cmd parameter while pressing the Liftgate Release Switch. The reading should change between On and Off.
- If the reading does not change between On and Off, refer to Liftgate Release Malfunction.

CIRCUIT/SYSTEM TESTING

Liftgate Release Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the liftgate release switch.
2. Ignition OFF, test for less than 1.0 ohm for resistance between the ground circuit terminal D and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool liftgate release 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 BCM.
4. Install a 3A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool liftgate release 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 BCM
5. If all circuits test normal, test or replace the liftgate release switch.

Liftgate Release Malfunction
1. Ignition OFF, disconnect the L/GATE RELSE relay.
2. Ignition OFF, test for less than 1.0 ohm of resistance between the relay coil ground circuit terminal and ground while pressing the liftgate release switch.
- If greater than the specified range, test for an open/high resistance.
3. Ignition ON, verify that a test lamp does not illuminate between the relay controlled output circuit terminal and ground.
- If the test lamp illuminates, test the control circuit for a short to voltage.
4. Verify that a test lamp illuminates between the relay switch B+ circuit terminal 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 L/GATE/S ROOF fuse is open, test the relay controlled output circuit terminal for a short to ground.
5. Ignition OFF, disconnect the harness connector at the liftgate door latch release actuator.
6. Ignition OFF, test for less than 1.0 ohm of resistance between the release actuator ground circuit terminal 3 and ground
- If greater than the specified range, test the ground circuit for an open/high resistance.
7. Connect the harness connector at the liftgate door latch release actuator.
8. Ignition ON, connect a 20A fused jumper wire between the relay switch B+ circuit terminal and the relay controlled output circuit terminal. Verify the release actuator is activated.
- If the release actuator does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the Liftgate Door Latch.
9. Connect a test lamp between the liftgate release relay control terminal and the relay coil ground circuit terminal.
10. Command the liftgate release ON and OFF by pressing and releasing the touchpad. 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, replace the BCM.
- 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, replace the BCM.
11. If all circuits test normal, test or replace the L/GATE RELSE relay.

COMPONENT TESTING

Release Actuator, Door Latch-Liftgate
1. Ignition OFF, disconnect the harness connector at the liftgate door latch.
2. Install a 20-amp fused jumper wire between the control circuit terminal 1 and 12 volts. Install a jumper wire between the ground circuit terminal 3 and ground. Verify the release actuator activates.
- If the actuator does not perform as specified, replace the liftgate door latch.

Liftgate Release Switch
1. Ignition OFF, disconnect the harness connector at the liftgate release switch.
2. Test for infinite resistance between the signal terminal B and the ground circuit terminal D with the switch in the open position.
- If not the specified value, replace the liftgate release switch.
3. Test for less than 2.0 ohms between the signal terminal B and the ground circuit terminal D with the switch in the closed position.
- If greater than the specified range, replace the liftgate release switch.

Relay Test
1. Ignition OFF, disconnect the L/GATE RELSE relay.
2. Test for 60-180 ohms of resistance between terminals 85 and 86.
- If the resistance is not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals:
- 30 and 86
- 30 and 87
- 30 and 85
- 85 and 87
- If not the specified value, replace the relay.

4. Install a 20-amp fused jumper wire between relay
terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms of resistance between terminals 30 and 87.
- If greater than the specified range, replace the relay.

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
- Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center)
- Control Module References for BCM replacement, setup and programming. Programming and Relearning
- Liftgate Outside Handle Replacement
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