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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 >> With UE1
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With 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 X3 harness connector at the CIM.
  2. Ignition ON, test for 8.5-9.5 volts between the navigation voice signal circuit terminal 2 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 navigation voice low reference circuit terminal 4 and ground.
    • If greater then specified range, test for a short to voltage. If the circuit tests normal, replace the radio.
  4. Ignition OFF, test for less than 10 ohms between the navigation voice low reference circuit terminal 4 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the radio.
  5. Ignition ON, test for 8.5-9.5 volts between the navigation voice signal circuit terminal 2 and the ground.
    • If less than specified range, test the drain wire circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  6. If all circuits test normal, replace the CIM.
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