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Home >> Chevrolet >> 2012 >> Chevy Express H1500, Van Cargo >> Repair and Diagnosis >> External Pages >> Different car >> Section 2327 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B2455 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 GMC Savana, 2013 GMC RV Cutaway, 2013 GMC Cutaway, 2013 Chevrolet RV Cutaway, and 2013 Chevrolet Express. 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 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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