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Home >> Cadillac >> 2008 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 141 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B2455 >> Circuit/System Testing
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Circuit/System Testing

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  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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