2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 440
DTC Descriptor
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 (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/Radio/Navigation System
Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
