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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1146 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B2455 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. 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 microphone.
  2. Ignition ON, test for 9-11 volts at signal circuit terminal B.
    • If greater than specified value, repair short to B+ or replace the navigation radio.
    • If less than specified value, repair short to ground or open/high resistance or replace the navigation radio.
  3. Disconnect the navigation radio X4 harness connector.
  4. Test for less than 1 volt at the cellular microphone terminal A.
    • If greater than specified value, repair short to B+.
  5. Test for greater than 1 ohm between terminal A and ground
    • If less than specified value, repair short to ground.
  6. Test for less than 1 ohm between terminal A and terminal 16.
    • If greater than the specified value, repair open/high resistance.
  7. If all circuits test normal, test or replace the cellular microphone.
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