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Home >> Cadillac >> 2007 >> CTS Base, 2.8 T, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 337 (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 XLR. 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 vehicle communication interface module (VCIM) has been damaged and requires replacement.
  1. Test for high resistance at the navigation mono audio signal circuit terminal 1 for an open or for a short to ground or for a short to voltage.
  2. Test for a high resistance or for a short to voltage at the navigation mono audio signal low reference circuit terminal 2 for an open.
  3. If the circuits test normal, test or replace the VCIM.
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