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Home >> Cadillac >> 2009 >> Escalade EXT >> Repair and Diagnosis (Single Page) >> External Pages >> Different car >> Section 8 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B2470 >> Test Description
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Test Description

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. 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 tests the condition of the cellular 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: 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  Inspect the cellular antenna and cellular antenna coupling assembly for damage.
Is the antenna assembly damaged?		 - Go to Step 7  Go to Step 3 
3 
IMPORTANT: The vehicle may be equipped with sectioned coax. Test each section and replace only the faulty section, not the entire length of coax.
  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 VCIM.
  2. Measure the resistance of the cellular antenna coax connector 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 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 
6 Inspect for poor connections at the harness connector of the cellular 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 7 
7 Replace the cellular antenna. Refer to Antenna Replacement - Cellular Communications/Digital Radio .
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 Control Module References for replacement, setup, and programming.
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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