Test Description

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers 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 1,200-1,800 mV.

DTC B1259

Step	Action	Values	Yes	No
Schematic Reference: Radio/Navigation System Schematics Connector End Views Reference: Entertainment/Communication Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	With a scan tool, observe the digital radio antenna in the digital radio receiver (DRR) data list. Does the scan tool indicate that the digital radio antenna is within the specified range?	1,200-1,800 mV or 42-118 mA	Go to Step 3	Go to Step 4
3	Test the antenna cables for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 10	Go to Step 8
4	Disconnect the antenna cables from the DRR. Measure the voltage from the center conductor of the inboard antenna connector on the DRR to one of the case screws. Does the voltage measure within the specified range?	4.5-5.5 V	Go to Step 5	Go to Step 6
5	Test the antenna cables for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	-	Go to Step 10	Go to Step 8
6	Inspect for poor connections at the DRR. 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 DRR. Refer to Control Module References . 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 Cellular Communications/Digital Radio Antenna Replacement . Did you complete the replacement?	-	Go to Step 10	-
10	Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset?	-	Go to Step 2	System OK