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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 808 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Microphone Inoperative - Caller Cannot Be Heard >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Saturn Vue. 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 greater than 9 volts between the terminal B and ground.
    • If less than specified value, test the cellular microphone signal circuit for an open/high resistance, for a short to ground, or for a short to the drain wire. If the circuit tests normal, test or replace the VCIM.
  3. Test for greater than 9 volts between the terminal B and the terminal A.
    • If less than specified value, test the drain wire for an open/high resistance. If the circuit tests normal, test or replace the VCIM.
  4. If all circuit test normal, replace the cellular microphone assembly.
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