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Home >> Cadillac >> 2009 >> STS V >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Cellular System, Entertainment System, And Navigation System >> Diagnostic Information and Procedures >> Navigation System - Voice Recognition Inoperative >> Circuit/System Testing >> Without UE1
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Without UE1

  1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  2. Ignition ON, test for 8.5-9.5 volts between the cellular microphone signal circuit terminal 10 and ground.
    • If less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
    • If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
  3. Ignition ON, test for less then 1 volt between the terminal 2 and ground.
    • If greater then specified range, test for a short to voltage. If the circuit tests normal, replace the radio.
  4. If all circuits test normal, replace the inside rearview mirror assembly.
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