2010 Cadillac Truck SRX AWD V6-3.0L Page 56
Diagnostic Fault Information
Circuit/System Description
The radio receives a vehicle speed signal from the electronic brake control module (EBCM) in order to correlate actual vehicle speed to the
movement of the vehicle calculated by the navigation system and reported serial data.
Conditions for Running the DTC
* Radio ON.
* Battery voltage must be between 9-16 V.
Conditions for Setting the DTC
* Vehicle speed from serial data is more than 5 km/h (3 mph) and vehicle speed pulse from the EBCM is 0 km/h (0 mph).
* Vehicle speed calculated from the navigation processing software is more than 36 km/h (22 mph) and vehicle speed pulse from the EBCM is
0 km/h (0 mph) for 10 seconds continuously.
Action Taken When the DTC Sets
* Turn by turn route navigation may be inoperative.
* Vehicle indicated location may be inaccurate.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC clears after 100 malfunction-free ignition cycles.
Reference Information
Schematic Reference
Radio/Navigation System Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/Radio/Navigation System
Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Navigation System Description and Operation (See: Accessories and Optional Equipment/Description and Operation/Navigation System)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information
Circuit/System Testing
Note: Diagnose any antilock brake system (ABS) related DTCs before performing this diagnostic.
1. Ignition OFF, disconnect the X4 harness connector at the A11 radio.
2. Ignition ON, operate the vehicle drive wheels at 5 mph. Test for 3-7 Hertz between the signal circuit terminal 20 and ground.
瀚慖f not within the specified range, test the signal circuit terminal 20 for an open, high resistance, short to ground or short to voltage. If the
circuit tests normal replace the K17 EBCM.
3. If the circuit tests normal, replace the A11 radio.
