2010 Cadillac CTS Sedan AWD V6-3.6L Page 484

2010 Cadillac CTS Sedan AWD V6-3.6L Page 484

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 V and 15.5 V.

* 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/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/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

1. Ignition OFF, disconnect the cellular antenna coax from the CIM module and the cellular antenna.

2. Ignition ON, test for less than 1 V between the antenna coax center terminal and ground.

瀚慖f greater than the specified range, replace the antenna coax.

3. Ignition ON, test for less than 1 V between the antenna coax outer shield and ground.

瀚慖f greater than the specified range, replace the antenna coax.

4. Test for infinite resistance between the antenna coax center terminal and ground.