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Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 227 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> OnStar Audio Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2011 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 harness connector at the radio.
  2. Ignition ON, test for a varying AC voltage between the following signal circuit terminals listed below and ground when the OnStar® Call Center button is pressed.
    • Audio Signal Circuit- terminal 20
    • Audio Common Circuit- terminal 6
    • If AC voltage was not present, test the circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the K73 telematics communication interface control module.
  3. If all circuits test normal, replace the radio.
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