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Home >> Cadillac >> 2007 >> CTS Base, 2.8 T, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 113 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> No (or Noisy) OnStar Audio >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: If the navigation mono audio signal low reference circuit is shorted to voltage the VCIM has been damaged and requires replacement.
  1. Disconnect Connector C2 from the VCIM.
  2. Test for high resistance at the cellular telephone voice signal circuit terminal 1 for an open or for a short to ground or for a short to voltage.
  3. Test for a high resistance, or for a short to voltage at thecellular telephone voice low reference circuit terminal 2 for an open.
  4. If the circuits test normal, test or replace the VCIM.
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