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Home >> Hummer >> 2008 >> H3 Alpha >> Repair and Diagnosis >> External Pages >> Different car >> Section 399 (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

WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
  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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