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Home >> Cadillac >> 2007 >> STS Base, 4.6 A, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> No (or Noisy) OnStar Audio >> Circuit/System Testing >> Noisy OnStar® Audio
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Noisy OnStar® Audio

WARNING: This page is about a different car, the 2008 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X2 radio harness connector.
  2. Disconnect the X2 VCIM harness connector.
  3. Test for less than 1 volt between the X2 VCIM connector terminal 1 and the radio X2 connector terminal 7.
    • If more than the specified value repair short to voltage on the mono out circuit.
  4. Test for less than 1 volt between the X2 VCIM connector terminal 2 and the radio X2 connector terminal 15.
    • If more than the specified value repair short to voltage on the low reference circuit.
  5. Test for infinite resistance between the X2 VCIM connector terminal 1 and 2 and ground.
    • If less than infinite resistance repair short to ground on the mono out circuit or low reference circuit.
  6. If all circuits test normal, replace the VCIM.
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