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Test Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The number(s) below refer to the step number(s) on the diagnostic table.

  1. 2:  This step checks that the Vehicle Communication Interface Module is sending out the proper supply voltage.
DTC B2455

Step Action Value(s) Yes No
Schematic Reference: OnStar Schematics 
Connector End View Reference: Cellular Communication Connector End Views 
1 Did you perform the Cellular Communications Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Cellular Communication 
2 
  1. Turn OFF the ignition.
  2. Disconnect the cellular microphone connector.
  3. Turn ON the ignition, with the engine OFF.
  4. Measure the voltage from the Cellular Microphone Signal circuit to a good ground.
Does the voltage measure greater than the specified value?		 9 V Go to Step 4  Go to Step 3 
3 Test the Cellular Microphone Signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 9  Go to Step 6 
4 Test the Cellular Microphone Low Reference circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 9  Go to Step 5 
5 Inspect for poor connections at the harness connector of the cellular microphone and harness connector of the Vehicle Communication Interface Module. 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 9  Go to Step 7 
6 Inspect for poor connections at the harness connector of the Vehicle Communication Interface Module. 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 9  Go to Step 8 
7 Replace the cellular microphone. Refer to OnStar Microphone Replacement  .
Did you complete the replacement?		 - Go to Step 9  -
8
IMPORTANT: Perform the OnStar® setup procedure.
Replace the Vehicle Communication Interface Module. Refer to Communication Interface Module Replacement (TrailBlazer, Envoy, Bravada) Communication Interface Module Replacement (TrailBlazer EXT, Envoy XL)  .Did you complete the replacement?		 - Go to Step 9  -
9
  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
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