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Home >> Cadillac >> 2014 >> Escalade Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System, And Navigation System >> Diagnostic Information and Procedures >> DTC B2455: Cellular Phone Microphone >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the cellular phone microphone.
  2. Ignition ON, test for 8.0-10.5 V between the microphone high signal circuit terminal 3 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 8.0-10.5 V between the microphone high signal circuit terminal 3 and the microphone low signal circuit terminal 2.
    • If less than the specified range, test the microphone low signal 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 microphone low signal 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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