Hatch Release Malfunction
Hatch Release 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 body control module (BCM) supplies a reference voltage to the liftgate handle switch through the rear closure handle switch open signal circuit. When the liftgate handle switch is operated, the rear closure handle switch open signal circuit is grounded through the liftgate handle switch ground circuit and the reference voltage is pulled low within the BCM. In response, the BCM applies battery positive voltage to the liftgate release relay control circuit, which energizes the coil side of the liftgate release relay. The switch side of the liftgate release relay then closes, supplying battery positive voltage through the relay and the liftgate latch control circuit activating the latch so that the rear hatch may be manually raised to an open position.
Reference Information
Schematic Reference
Release Systems Schematics Release Systems Schematics
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1
Description and Operation
Rear Hatch/Gate Description and Operation Rear Hatch/Gate
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Circuit/System Verification
1. Vehicle in Service Mode.
2. Verify the operation of the rear hatch when commanding the Rear Body Closure Unlatch with a scan tool.
• If the rear compartment lid latch does not Unlatch
Refer to Circuit/System Testing - Liftgate Latch Inoperative
• If the rear compartment lid latch does Unlatch
3. Verify the operation of the rear hatch when commanding the liftgate latch to UNLATCH with the liftgate handle switch.
• If the rear compartment lid latch does not UNLATCH
Refer to Circuit/System Testing - Hatch Release Switch Inoperative
• If the rear compartment lid latch does UNLATCH
4. All OK.
Circuit/System Testing
Liftgate Latch Inoperative
1. Vehicle OFF, disconnect the KR95A liftgate unlatch relay. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 48 and ground.
• If 10 ohms or greater
1. Vehicle OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Vehicle in Service Mode.
4. Verify a test lamp illuminates between the B+ circuit terminal 46 and ground.
• If the test lamp does not illuminate
1. Vehicle OFF.
2. Test for less than 2 ohms in the ignition circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If the test lamp illuminates
5. Connect a test lamp between the control circuit terminal 44 and the ground circuit terminal 48.
6. Verify the test lamp turns ON when commanding the Rear Body Closure Unlatch with a scan tool.
• If the test lamp is always OFF
1. Vehicle OFF, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If the test lamp is always ON
1. Vehicle OFF, disconnect the harness connector at the K9 body control module, Vehicle in Service Mode.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 body control module.
• If the test lamp turns ON and OFF
7. Verify that a test lamp does not illuminate between the control circuit terminal 45 and ground.
• If the test lamp illuminates
Repair the short to voltage on the control circuit
• If the test lamp does not illuminate
8. Vehicle OFF, disconnect the harness connector at the A23C liftgate latch assembly. It may take up to 2 minutes for all vehicle systems to power down.
9. Test for less than 10 ohms between the ground circuit terminal 1 and ground.
• If 10 ohms or greater
1. Vehicle OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
10. Connect the harness connector at the A23C liftgate latch assembly.
11. Vehicle in Service Mode, connect a 10 A fused jumper wire between the B+ circuit terminal 46 and the control circuit terminal 45.
12. Verify the A23C liftgate latch assembly is activated.
• If the A23C liftgate latch assembly does not activate
1. Vehicle OFF, disconnect the harness connector at the A23C liftgate latch assembly.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the A23C liftgate latch assembly.
• If the A23C liftgate latch assembly activates
13. Test or replace the KR95A liftgate unlatch relay.
Hatch Release Switch Inoperative
1. Vehicle OFF, disconnect the harness connector at the S46 liftgate handle switch. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 2 and ground.
• If 10 ohms or greater
1. Vehicle OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Vehicle in Service Mode.
4. Test for greater than 10 V between the signal circuit terminal 1 and ground.
• If 10 V or less
1. Vehicle OFF, disconnect the X6 harness connector at the K9 body control module.
2. Test for infinite resistance between the signal circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance on the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If greater than 10 V
5. Test or replace the S46 liftgate handle switch.
Component Testing
Rear Compartment Lid Latch
1. Vehicle OFF, disconnect the harness connector at the A23C liftgate latch assembly.
2. Install a 25 A fused jumper wire between the control terminal 3 and 12 V. Install a jumper wire between the ground terminal 1 and ground.
3. Verify the A23C liftgate latch assembly activates
• If the A23C liftgate latch assembly does not activate.
Replace the A23C liftgate latch assembly.
• If the A23C liftgate latch assembly does activate.
4. All OK
Hatch Release Switch
1. Vehicle OFF, disconnect the harness connector at the S46 liftgate handle switch.
2. Test for infinite resistance between the signal terminal 1 and the ground terminal 2 with the switch in the open position.
• If less than infinite resistance
Replace the S46 liftgate handle switch.
• If infinite resistance
3. Test for less than 3 ohms between the signal terminal 1 and the ground terminal 2 with the switch in the closed position.
• If 3 ohms or greater
Replace the S46 liftgate handle switch.
• If less than 3 ohms
4. All OK
Relay Test
1. Vehicle OFF, disconnect the KR95A liftgate unlatch relay.
2. Test for 60-200 ohms between terminals 44 and 48.
• If less than 60 ohms or greater than 200 ohms
Replace the KR95A liftgate unlatch relay.
• If between 60-200 ohms
3. Test for infinite resistance between the terminals listed below:
* 44 and 46
* 44 and 45
* 48 and 46
* 48 and 45
• If less than infinite resistance
Replace the KR95A liftgate unlatch relay.
• If infinite resistance
4. Install a 3 A fused jumper wire between relay terminal 44 and 12 V. Install a jumper wire between relay terminal 48 and ground.
5. Test for less than 2 ohms between terminals 46 and 45.
• If 2 ohms or greater
Replace the KR95A liftgate unlatch relay.
• If less than 2 ohms
6. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)
* Liftgate Latch Replacement Service and Repair
* Liftgate Release Switch Replacement Liftgate Release Switch Replacement
* Control Module References Programming and Relearning for BCM replacement, programming and setup