LEMON Manuals: Even more car manuals for everyone
Home >> Saturn >> 2009 >> Aura Green Line >> Repair and Diagnosis >> External Pages >> Different car >> Section 841 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> OnStar Microphone Inoperative - Caller Cannot Be Heard >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Saturn Aura. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the cellular microphone.
  2. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal A 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 CIM.
  3. Ignition ON, test for 8.5-9.5 volts between the cellular microphone signal circuit terminal B and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the CIM.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CIM.
  4. If all circuits test normal, replace the cellular microphone.
scientia non olet · About LEMON Manuals