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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1325 (ENTERTAINMENT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1259TEST DESCRIPTION
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Test Description

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Test Description
WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 3:  Due to current limiting capabilities in the module, an antenna cable shorted to ground could still show 1200-1800 mV.
DTC B1259

Step Action Values Yes No
Schematic Reference:  Radio/Audio System Schematics  
Connector End Views Reference:  Entertainment Connector End Views  
1 Did you perform the Radio/Audio System Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Radio/Audio System 
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?		 1200-1800 mV or 42-118mA 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 in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 8 
4
  1. Disconnect the antenna cables from the digital radio receiver.
  2. Measure the voltage from the center conductor of the inboard antenna connector on the digital radio receiver 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 high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 8 
6 Inspect for poor connections at the digital radio receiver. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 7 
7 Replace the digital radio receiver. Refer to Receiver Replacement - Digital Radio .
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 in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 10  Go to Step 9 
9 Replace the digital radio antenna. Refer to Antenna Replacement - Digital Radio .
Did you complete the replacement?		 - Go to Step 10  -
10
  1. Use the scan tool in order to clear the DTCs.
  2. 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
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.