2010 Cadillac CTS Sedan AWD V6-3.6L Page 544
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) monitors the rear door ajar circuits to indicate the status of the rear doors. When the respective door is opened, the
door ajar signal circuit is switched to ground by the door lock ajar indicator switch, the BCM detects the drop in voltage in the circuit and then
communicates this status to the instrument panel cluster (IPC) via a serial data message. The IPC, upon receipt of this serial data message, will
illuminate the appropriate ajar message in the driver information center (DIC) and when the transaxle is shifted out of PARK, the DIC will also
send a serial data message to the radio to activate the door ajar audible warning.
Conditions for Running the DTC
The system voltage is 9-18 volts.
Conditions for Setting the DTC
The BCM detects a short to ground in a rear door ajar circuit for longer than 10 minutes.
Action Taken When the DTC Sets
The appropriate door ajar indicator is continuously illuminated.
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
Door Lock/Indicator Schematics (See: Body and Frame/Locks/Diagrams/Electrical Diagrams/Door Lock/Indicator 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 Right Rear Door Ajar Sw. and Left Rear Door Ajar Sw, parameters while opening and closing each rear door.
The parameters should change between Door Closed and Door Ajar.
