2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 440

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)