2010 Cadillac CTS Sedan AWD V6-3.6L Page 495
Circuit/System Description
The rear compartment lid ajar switch, which is internal the rear compartment lid release actuator, is supplied with ground which causes the trunk
ajar switch signal circuit to be pulled low. The trunk ajar switch signal circuit is an input to the body control module (BCM). When the BCM
receives a trunk ajar signal, a serial data message is sent to the driver information center (DIC) requesting the TRUNK OPEN message be
displayed.
Conditions for Running the DTC
Battery voltage is between 9-16 volts.
Conditions for Setting the DTC
The BCM detects a fault in the rear compartment lid ajar switch signal circuit.
Action Taken When the DTC Sets
The TRUNK OPEN indicator will be not illuminate or continuously illuminate.
Conditions for Clearing the DTC
* The DTC will be current for as long as the fault is present.
* When the fault is no longer present, the DTC will be a history DTC.
* A history DTC will clear after 50 ignition cycles.
Reference Information
Schematic Reference
Release Systems Schematics (See: Body and Frame/Locks/Diagrams/Electrical Diagrams/Release Systems Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Luggage Compartment Description and Operation (See: Body and Frame/Doors, Hood and Trunk/Trunk / Liftgate/Description and Operation)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit
Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/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 trunk. The parameter should change between
Inactive and Active.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the rear compartment lid latch.
2. Ignition ON, verify the scan tool Rear Closure Ajar Sw. parameter is Inactive.
瀚慖f not the specified value, test the signal circuit terminal C 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 C and ground. Verify the scan tool Rear Closure Ajar Sw. parameter is
Active.
瀚慖f not the specified value, test the signal circuit terminal C for a short to voltage or and open/high resistance. If the circuit tests normal,
replace the BCM.
4. If all circuits test normal, test or replace the rear compartment lid latch.
