B1259
DTC B1259
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B1259 02
- Antenna Ground Circuit Short to Ground
DTC B1259 05
- Antenna Ground Circuit Short to Battery or Open
Diagnostic Fault Information
Circuit/System Description
The digital radio receiver (DRR) receives an XM satellite radio signal via the digital radio antenna. This signal is passed to the DRR through the digital radio antenna coax. The DRR sends a varying AC mV signal through separate left and right audio circuits (+ and -) to the radio. The voltage amount and rate of change is dependent upon the type of signal being received. The radio then processes these signals and passes the audio to the appropriate speakers or amplifier.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
B1259 02
The DRR detects a short to ground in the antenna circuit.
B1259 05
The DRR detects a short to voltage or an open in the antenna circuit.
Action Taken When the DTC Sets
The radio displays No XM Signal.
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 southern sky to ensure proper reception of the satellite signal. Reception may limited, intermittent or not possible inside structures or under heavy cover.
Reference Information
Schematic Reference
Radio/Navigation System Schematics Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views A/C Compressor Clutch
Description and Operation
Radio/Audio System Description and Operation Radio/Audio System
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Special Tools
EL-48028 - Digital Radio Test Antenna
Circuit System Verification
With the vehicle outside in an area with an unobstructed view of the southern sky, tune to XM. Verify XM reception is clear and the No XM Signal message is not displayed on the radio.
Circuit/System Testing
1. Ignition OFF, disconnect the antenna coax from the DRR. Connect the EL-48028 - antenna to the DRR.
2. Radio ON, tuned to XM, verify DTC B1259 is not set as current.
• If the DTC is current, replace the DRR.
3. Ignition OFF, reconnect the antenna coax to the DRR, disconnect the digital radio antenna coax from the digital radio antenna.
4. Ignition ON, test for 4.5-5.5 volts between the antenna coax center terminal and the coax outer shield.
• If not within the specified range, replace the antenna coax.
5. If all circuits test normal, replace the digital radio antenna.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Cellular Communications/Digital Radio Antenna Replacement Cellular Communications/Digital Radio Antenna Replacement
* Control Module References Control Module References for DRR replacement, setup, and programming