Trunk Release Inoperative (Convertible)
Trunk Release Inoperative (Convertible)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) grounds the trunk release relay control circuit based on trunk release switch signals from either the interior rear compartment lid release switch or the exterior rear compartment lid release switch. The rear compartment lid latch assembly is supplied battery voltage via the TRUNK RELSE fuse through the TRUNK RELSE relay. When either the interior or exterior rear compartment lid release switch is pressed, the trunk release switch signal circuit is grounded. This input will request the BCM to ground the trunk release relay control circuit, which will switch the TRUNK RELSE relay. With the relay contacts closed, battery voltage is supplied to the rear compartment lid latch assembly, opening the rear compartment.
Diagnostic Aids
If the folding top is not fully extended and latched or fully retracted with the tonneau closed, rear compartment lid release functionality will be suspended. For folding top symptoms, refer to Symptoms - Roof (Symptoms - Roof).
Reference Information
Schematic Reference
Release Systems Schematics (Release Systems Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Luggage Compartment Description and Operation (Coupe) (Description and Operation)Luggage Compartment Description and Operation (Convertible and Z06) (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
1. Ignition ON, observe the scan tool Trunk Release Switch parameter while pressing and releasing the interior rear compartment lid release switch. The parameter should change between Active and Inactive.
• If the parameter does not change, refer to Interior Trunk Release Switch Malfunction.
2. Observe the scan tool Ext. Rear Compartment Lid Release Sw. parameter while pressing and releasing the exterior rear compartment lid release switch. The parameter should change between Active and Inactive.
• If the parameter does not change, refer to Exterior Trunk Release Switch Malfunction.
3. Insert the key into the trunk lock cylinder and observe the scan tool Trunk Key Cylinder Switch parameter while turning the key to the OPEN position, the parameter should change between Inactive and Active.
• If the parameter does not change, refer to Trunk Key Switch Malfunction.
4. Command the Trunk Release with a scan tool, the rear compartment lid latch should release the trunk lid.
• If the trunk lid does not release, refer to Trunk Release Malfunction.
Circuit/System Testing
Interior Trunk Release Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the interior rear compartment lid release switch.
2. Verify that a test lamp illuminates between B+ and the ground circuit terminal A.
• If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Trunk Release Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal D 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 D and ground. Verify the scan tool Trunk Release Switch 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 BCM.
5. If all circuits test normal, test or replace the interior rear compartment lid release switch.
Exterior Trunk Release Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the exterior rear compartment lid release switch.
2. Test for less than 5 ohms between the ground circuit terminal A and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Ext. Rear Compartment Lid Release 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 remote control door lock receiver (RCDLR).
4. Install a 3A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool Ext. Rear Compartment Lid Release 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 RCDLR.
5. If all circuits test normal, test or replace the exterior rear compartment lid release switch.
Trunk Key Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the rear compartment lid key switch.
2. Test for less than 5 ohms between the ground circuit terminal 2 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Trunk Key Cylinder Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the BCM.
4. Install a 3-A fused jumper wire between the signal circuit terminal 1 and ground. Verify the scan tool Trunk Key Cylinder Switch 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 BCM.
5. If all circuits test normal, test or replace the rear compartment lid key switch.
Trunk Release Malfunction
1. Ignition OFF, disconnect the TRUNK RELSE relay.
2. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal D9 and ground.
• If the test lamp illuminates, test the control circuit for a short to voltage.
3. Verify that a test lamp illuminates between the B+ circuit terminal C7 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 B+ circuit fuse is open, test the control circuit terminal D9 for a short to ground. If the circuit tests normal, test or replace the TRUNK RELSE relay.
4. Verify that a test lamp illuminates between the B+ circuit terminal D7 and ground.
• If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
5. Ignition OFF, disconnect the harness connector at the rear compartment lid latch.
6. Test for less than 5 ohms between the ground circuit terminal E and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
7. Connect the harness connector at the rear compartment lid latch.
8. Ignition ON, connect a 15A fused jumper wire between the B+ circuit terminal C7 and the control circuit terminal D9. Verify the rear compartment lid latch is activated.
• If the rear compartment lid latch does not activate, test the control circuit for an open/high resistance. If the circuit tests normal, test or replace the rear compartment lid latch.
9. Connect a test lamp between the B+ circuit terminal D7 and the control circuit terminal C9.
10. Command the Trunk Release ON and OFF with a scan tool. 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 ground. If the circuit tests normal, replace the BCM.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
11. If all circuits test normal, test or replace the TRUNK RELSE relay.
Component Testing
Rear Compartment Lid Latch
1. Ignition OFF, disconnect the harness connector at the rear compartment lid latch.
2. Install a 15A fused jumper wire between the B+ terminal D and 12 volts. Install a jumper wire between the ground terminal E and ground. Verify the rear compartment lid latch activates.
• If the rear compartment lid latch does not perform as specified, replace the rear compartment lid latch.
Rear Compartment Lid Release Switch
1. Ignition OFF, disconnect the harness connector at the appropriate rear compartment lid release switch.
2. Test for infinite resistance between the signal terminal and the ground terminal listed below with the switch in the open position.
* Interior rear compartment lid release switch signal terminal D and ground terminal A.
* Exterior rear compartment lid release switch signal terminal B and ground terminal A.
• If not the specified value, replace the rear compartment lid release switch.
3. Test for less than 2 ohms between the signal terminal and the ground terminal listed below with the switch in the closed position.
* Interior rear compartment lid release switch signal terminal D and ground terminal A.
* Exterior rear compartment lid release switch signal terminal B and ground terminal A.
• If greater than the specified range, replace the rear compartment lid release switch.
Relay Test
1. Ignition OFF, disconnect the TRUNK RELSE relay.
2. Test for 60-180 ohms between terminals 85 and 86.
• If 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 25-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 between terminals 30 and 87.
• If greater than the specified range, replace the relay.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Rear Compartment Lid Lock Cylinder Replacement (Service and Repair)
* Rear Compartment Lid Latch Replacement (Service and Repair)
* Relay Replacement (Attached to Wire Harness) (Relay Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (Relay Replacement (Within an Electrical Center))
* Rear Compartment Lid and Fuel Filler Door Release Switch Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for BCM or RCDLR replacement, setup, and programming