* 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.
If the antenna assembly is damaged, replace the cellular antenna.
Circuit/System Testing
Note: The vehicle may be equipped with sectioned coax. Test each section and replace only the faulty section, not the entire length of coax.
No comments:
Post a Comment