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Home >> Buick >> 2018 >> Enclave Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B2455: Cellular Phone Microphone Circuit >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia Limited, 2017 Chevrolet Traverse, and 2017 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the cellular phone microphone.
  2. Ignition ON, test for 9.5 - 10.5 V between the signal circuit terminal B and ground.
    • If less than the specified range, test the circuit for a short to ground, shorted together, or an open/high resistance. If the circuit tests normal, replace the vehicle communication interface control module.
    • If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the vehicle communication interface control module.
  3. Test for 9.5 - 10.5 V between the signal circuit terminal B and the low reference circuit terminal A.
    • If less than the specified range, test the low reference circuit for a short to ground, shorted together, or an open/high resistance. If the circuit tests normal, replace the vehicle communication interface control module.
    • If greater than the specified range, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the vehicle communication interface control module.
  4. If all circuit test normal, replace the cellular phone microphone.
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