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Home >> Cadillac >> 2017 >> CTS V >> Repair and Diagnosis >> External Pages >> Different car >> Section 185 (Cellular System, Entertainment System And Navigation System) >> Diagnostic Information and Procedures >> DTC B2476 or B2482: Cellular Phone Select Service Switch >> Circuit/System Verification
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Circuit/System Verification

WARNING: This page is about a different car, the 2016 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Contact the OnStar® Call Center first before pressing the emergency button in order to notify them of the test.
  1. Ignition ON/vehicle in Service Mode.
  2. Verify that each button of the S51 Telematics Button Assembly operates normally by pressing each button individually.
    • If none of the buttons operate normally 

      Refer to Circuit/System testing

    • If some, but not all, of the buttons operate normally 

      Test or replace the S51 Telematics Button Assembly

    • If all of the buttons operate normally 
  3. All OK.
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