2010 Cadillac Truck SRX AWD V6-3.0L Page 433
B1259 02
The Digital Audio Broadcast module detects a short to ground in the antenna circuit.
Action Taken When the DTC Sets
The radio no longer emits audio when on digital audio broadcast radio.
Conditions for Clearing the DTC
* A current DTC will clear when the conditions for setting the DTC are no longer present.
* A history DTC clears after 100 malfunction-free ignition cycles.
Diagnostic Aids
When diagnosing digital radio concerns, the vehicle should be located outside with an unobstructed view of the sky to ensure proper reception of
the digital radio signal. Reception may limited, intermittent or not possible inside structures or under heavy cover.
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
Radio/Audio System Description and Operation (See: Accessories and Optional Equipment/Description and Operation/Radio/Audio 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
Special Tools
EL-48028 Digital Radio Test Antenna
Circuit/System Verification
1. Tune to a strong AM or FM station and verify each speaker is producing clear and even sound, with no distortion.
瀚慖f any speaker is not producing sound or the sound produced is distorted, refer to Speaker Malfunction ( See: Accessories and Optional
Equipment/Testing and Inspection/Symptom Related Diagnostic Procedures/Speaker Malfunction).
2. With the vehicle outside in an area with an unobstructed view of the sky, tune to Digital Audio. Verify reception is clear and audio is emitted
from the A11 radio.
Circuit/System Testing
1. Ignition OFF, disconnect the digital audio antenna coax from the digital audio broadcast module. Connect the EL-48028 to the radio.
2. Radio ON, tuned to Digital Audio, verify DTC B1259 is not set as current.
瀚慖f the DTC is current, replace the A12 digital radio receiver.
3. Ignition OFF, reconnect the antenna coax to the radio, disconnect the digital radio antenna coax from the T4H digital radio antenna.
4. Ignition ON, test for 4.5-5.5 V between the antenna coax center terminal and the coax outer shield.
瀚慖f not within the specified range, replace the antenna coax.
