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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 numbers below refer to the step numbers on the diagnostic table.

  1. 2:  This step checks the condition of the cellular and navigation antenna.
  2. 3:  This step tests the condition of the cellular antenna coax and for proper ground of the cellular antenna.
DTC B2470

Step Action Value Yes No
Schematic Reference: OnStar Schematics 
Connector End View Reference: Cellular Communication Connector End Views 
1 Did you perform the Cellular Communication Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Cellular Communication 
2  Inspect the cellular and navigation antenna assembly for damage.
Is the antenna assembly damaged?		 - Go to Step 7  Go to Step 3 
3 
  1. Disconnect the cellular antenna coax from the vehicle communication interface module (VCIM).
  2. Measure the resistance between the center conductor and the outer metal shield.
Does the meter read out of limits?		 - Go to Step 4  Go to Step 5 
4
  1. Disconnect the cellular antenna coax from the cellular and navigation antenna assembly maroon connector.
  2. Measure the resistance of the cellular antenna coax center conductor from end to end.
Does the resistance measure greater than the specified value?		 1 Ω Go to Step 8  Go to Step 6 
5 Inspect for poor connections at the harness connector of the VCIM. Refer toTesting 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 
6 Inspect for poor connections at the harness connector of the cellular and navigation 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 7 
7 Replace the cellular and navigation antenna. Refer to Antenna Assembly Replacement - Cellular and Navigation  .
Did you complete the replacement?		 - Go to Step 10  -
8 Replace the cellular antenna coax.
Did you complete the replacement?		 - Go to Step 10  -
9 Replace the VCIM. 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 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
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