2010 Cadillac Truck SRX AWD V6-3.0L Page 551
To prevent false reading when testing the center coax terminals, use care not to ground the test probe on the outer housing/shield.
Coax Cable Test
1. Ignition OFF, disconnect the coax cable at both components.
2. Test for less than 5 ohm between both ends of the coax cables center terminals.
瀚慖f greater than the specified range, replace the coax cable
3. Test for greater than 10k ohm between the coax cable center wire and the outer coax shield.
瀚慖f less than the specified range, replace the coax cable.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Radio Antenna Base Replacement (See: Accessories and Optional Equipment/Antenna/Antenna, Radio/Service and Repair/Radio Antenna
Base Replacement)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for telematics communication interface control
module replacement, setup, and programming
B2470
DTC B2470
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 Open Circuit
Circuit/System Description
The cellular phone antenna is connected to the telematics communication interface control module with a RG-58 coax cable. The telematics
communication interface control module polls the data from the cellular phone 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 telematics communication interface control module does not detect the presence of a cellular phone antenna.
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 telematics communication interface control module detects the presence of a cellular phone 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)
