B1259

DTC B1259

CIRCUIT DESCRIPTION
The first design digital radio antenna is connected to the digital radio receiver 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 D.C. current for powering the antenna. The second design digital radio antenna is connected to the digital radio receiver by 1 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 digital radio receiver 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 13:

The number below refers to the step numbers on the diagnostic table.
2. First design has 2 antenna cables connected to the digital radio receiver, second design has 1 antenna cable.
3. Early design modules support the mV reading while later design modules support the mA reading.
5. Due to current limiting capabilities in the module, an antenna cable shorted to ground could still show 1200-1800 mV.