Circuit Description
The digital radio antenna is connected to the digital radio receiver by one coax cable. This cable carries the satellite and the terrestrial signal. The antenna cable also provides a path for DC current for powering the antenna.
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. |
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Radio/Audio System Schematics | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 | With a scan tool, observe the digital radio antenna in the digital radio receiver data list. Does the scan tool indicate that the digital radio antenna is within the specified range? | 17-63 mA | Go to Step 6 | Go to Step 3 |
3 |
Does the voltage measure within the specified range? | 4.5-5.5 V | Go to Step 4 | Go to Step 6 |
4 | Test the antenna cable for an open or a high resistance. Refer to Circuit Testing . Did you find the condition? | -- | Go to Step 5 | Go to Step 8 |
5 | Replace the antenna cable. Refer to Digital Radio Antenna Cable Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
6 | Inspect for poor connections at the digital radio receiver. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 7 |
7 | Replace the digital radio receiver. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 10 | -- |
8 | Inspect for poor connections at the digital radio antenna. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 9 |
9 | Replace the digital radio antenna. Refer to Digital Radio Antenna Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
10 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
