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HOMESERVICE MANUALSBUICK2005LESABRE LIMITED, 4T65E/M15REPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSCELLULAR COMMUNICATION SYSTEMSDIAGNOSTIC INFORMATION AND PROCEDURESDTC B2470TEST DESCRIPTION
2005 Buick LeSabre Limited, 4T65E/M15

Test Description

2005 Buick LeSabre Limited, 4T65E/M15SECTION Test Description

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: Cellular 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
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.