LEMON Manuals: Even more car manuals for everyone: 1960-2025
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 >> Microphone Inoperative - Caller Cannot Be Heard >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

  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 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 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.
scientia non olet · About LEMON Manuals