B1259

DTC B1259

Circuit Description

The first design digital radio antenna is connected to the digital radio receiver (DRR) by 2 coax cables. One coax carries the satellite signal, the other coax carries the terrestrial signal. The antenna cable for the satellite antenna also provides a path for DC current for powering the antenna. The second design digital radio antenna is connected to the digital radio receiver by one coax cable. This coax carries the satellite and the terrestrial signal.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B1259 Antenna Ground Circuit

Conditions for Running the DTC

This test is run every 300 milliseconds.

Conditions for Setting the DTC

The DRR detects an antenna fault.

Action Taken When the DTC Sets

The radio displays "No XM Signal."

Conditions for Clearing the DTC

* The condition must be corrected.
* The DTC clears after 100 malfunction free ignition cycles.

Test Description

Step 1 - Step 11:

The number below refers to the step number on the diagnostic table.
2. Early design modules support the mV reading while later design modules support the mA reading.
3. Due to current limiting capabilities in the module, an antenna cable shorted to ground could still show 1200-1800 mV.