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Home >> Chevrolet >> 2011 >> Camaro LS, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Cellular System, Entertainment System, And Navigation System >> Diagnostic Information and Procedures >> OnStar Microphone Malfunction >> Circuit/System Testing

Circuit/System Testing

NOTE: This procedure is not used in Brazil.
  1. Ignition OFF, disconnect the harness connector at the cellular microphone.
  2. Ignition OFF, test for less than 5 Ω 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 9-11 V between the 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.
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