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Home >> Cadillac >> 2007 >> STS Base, 4.6 A, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System, And Navigation System >> Diagnostic Information and Procedures >> Navigation System - Voice Recognition Inoperative >> Without OnStar®
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Without OnStar®

  1. Ignition OFF, disconnect the harness connector at the rearview mirror.
  2. Ignition ON, test for greater than 9 volts between the terminal 2 and ground.
    • If less than specified value, test the cellular microphone signal circuit for an ope/high resistance, for a short to ground, or for a short to the drain wire. If the circuit tests normal, test or replace the radio.
  3. Test for greater than 9 volts between the terminal 2 and the terminal 10.
    • If less than specified value, test the drain wire for an open/high resistance. If the circuit tests normal, test or replace the radio.
  4. If all circuit test normal, replace the rearview mirror assembly.
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