2010 Cadillac CTS Sedan AWD V6-3.0L Page 2045

2010 Cadillac CTS Sedan AWD V6-3.0L Page 2045

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)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)