2010 Cadillac Truck SRX FWD V6-3.0L Page 56

2010 Cadillac Truck SRX FWD 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.