2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 625

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 625

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptor

DTC B2470 04

- Cellular Phone Antenna Circuit Malfunction Open Circuit

Circuit/System Description

The cellular antenna is connected to the communication interface module (CIM) with a RG-58 coax cable. The CIM polls the data from the cellular

antenna once every second.

Conditions for Running the DTC

* Ignition in the RUN or ACC position.

* System voltage is between 9.5 volts and 15.5 volts.

* The above conditions are present for greater than 1 second.

Conditions for Setting the DTC

* The CIM does not detect the presence of a cellular antenna.

* The above conditions are present for greater than 1 second.

Action Taken When the DTC Sets

* The vehicle is unable to connect to the OnStar(R) Call Center.

* The OnStar(R) status LED turns red.

Conditions for Clearing the DTC

* The CIM detects the presence of a cellular antenna.

* A history DTC clears after 50 malfunction-free ignition cycles.

Reference Information

Schematic Reference

OnStar Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/OnStar Schematics)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

OnStar Description and Operation (See: Accessories and Optional Equipment/Description and Operation/OnStar Description and Operation)

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 Verification

Verify that the cellular antenna and cellular antenna coupling assembly are not damaged.