B1259

DTC B1259

CIRCUIT DESCRIPTION
Two antenna coax cables connect the digital radio antenna assembly to the digital radio receiver (DRR). The DRR supplies a regulated 5-volt signal, on the satellite coax cable, to power up the circuitry of the digital radio antenna. The satellite coax cable also carries the satellite antenna signal. The other coax cable carries the terrestrial antenna signal to the DRR.

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC B1259 Antenna Ground Circuit




This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description in Vehicle DTC Information. DTC Symptom Description

CONDITIONS FOR RUNNING THE DTC
The following are conditions that must be present in order for the digital radio receiver to enable the diagnostics.
- The DRR is in the ACCESSORY or RUN power mode and Infotainment VN is allowed.
- The system voltage is at least 9 volts and no more than 16 volts.
- All the above conditions are present for greater than 50 ms.

CONDITIONS FOR SETTING THE DTC
The DRR detects an open in the antenna circuit.

ACTION TAKEN WHEN THE DTC SETS
- The radio displays "No XM Signal."
- The radio produces no audio.

CONDITIONS FOR CLEARING THE DTC
- The conditions for setting the DTC are no longer present.
- A history DTC clears after 100 malfunction free ignition cycles.
- The DRR receives the clear code command from the scan tool.

TEST DESCRIPTION

Step 1 - Step 12:

The number below refers to the step number on the diagnostic table.
4. Due to current limiting capabilities in the module, an antenna cable shorted to ground could still show 1200-1800 mV.