2010 Cadillac CTS Sedan AWD V6-3.0L Page 2049
DTC U1827 7F
- Lost Communication With Steering Angle Sensor Module on Bus "B" Erratic
Diagnostic Fault Information
Circuit/System Description
The electronic brake control module (EBCM) activates the other modules connected to the CAN serial data circuits by applying voltage when the
ignition key is in ACC, ON or START. The EBCM, Yaw Rate Sensor, and the Steering Angle or Steering Wheel Position Sensor are the only
modules connected to the CAN bus serial data circuits. For more information on CAN bus serial data refer to Data Link Communications
Description and Operation (See: Powertrain Management/Computers and Control Systems/Information Bus/Description and Operation).
Conditions for Running the DTC
* Ignition is On, the system voltage is between 9-16 volts.
* The vehicle power mode master requires serial data communication to occur.
Conditions for Setting the DTC
A supervised periodic message that includes the transmitter module availability is missing or invalid.
Action Taken When the DTC Sets
* The EBCM disables the VSES for the duration of the ignition cycle.
* The driver information center (DIC) displays the STABILITRAK Off message.
* The ABS/TCS remains functional.
Conditions for Clearing the DTC
* A current DTC clears when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.
Diagnostic Aids
* Use the DTC Descriptor list above to determine the module which is not communicating.
* If there are multiple non-communicating modules choose the one closest to the EBCM.
Reference Information
Schematic Reference
* Data Communication Schematics (See: Powertrain Management/Computers and Control Systems/Information Bus/Diagrams/Electrical
Diagrams)
* Antilock Brake System Schematics (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Diagrams/Electrical
Diagrams)
* Control Module References (See: Testing and Inspection/Programming and Relearning)
Connector End View Reference
