2010 Cadillac CTS Sedan AWD V6-3.6L Page 2059
the body control module (BCM) through a bi-directional data circuit (LIN). The instrument panel cluster (IPC) receives compass information from
the BCM via the serial data circuit.
Conditions for Running the DTC
The system voltage is between 9-16 volts.
Conditions for Setting the DTC
U1500 01
When there is a short to voltage in the local interconnect network bus circuit.
U1500 02
When there is a short to ground in the local interconnect network bus circuit.
U1511, U1512
The DTC will set when there is an open/high resistance in the local interconnect network bus circuit, or an open in the voltage or ground circuits of
the motor or module.
Action Taken When the DTC Sets
U1500
The individual LIN bus will be inoperative, disabling all windows on one side of the vehicle.
U1511
* If set in the driver door lock window switch or passenger door lock window switch, no window on the specific side of the vehicle will
operate if the open is before the first splice from the door module, and both DTC U1511 and U1512 should set. If open after the first splice,
the individual window will be inoperative and a single DTC should set.
* If set in the BCM, the compass is inoperative in the DIC.
U1512
No window on the specific side of the vehicle will operate if the open is before the first splice from the door module, and both DTC U1511 and
U1512 should set. If open after the first splice, the individual window will be inoperative and a single DTC should set.
Conditions for Clearing the DTC
* The current DTC will clear when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
Diagnostic Aids
* A window regulator motor may cause a short to the local interconnect network bus circuit, and will cause all windows on one side to be
inoperative.
* An open/high resistance between the door module and the first splice from the module will cause all windows on one side to be inoperative.
* An open/high resistance between the window regulator motor and the first splice from the motor will cause only one window to be
inoperative.
* Use the DMM MIN/MAX function to capture/locate intermittent conditions.
Reference Information
Schematic Reference
Data Communication Schematics (See: Powertrain Management/Computers and Control Systems/Information Bus/Diagrams/Electrical Diagrams)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Data Link Communications Description and Operation (See: Powertrain Management/Computers and Control Systems/Information
Bus/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)
