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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 >> No OnStar® Audio
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No 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. Ignition ON, test for a momentary AC voltage (OnStar® audio signal) between the X2 connector terminal cavity 7 and 15 when the white dot button on the keypad is pressed.
    • If a momentary AC voltage was present replace the radio.
  3. Ignition OFF, disconnect the X2 VCIM harness connector.
  4. Test for less than 1 ohm between the X2 VCIM connector terminal 1 and the radio X2 connector terminal 7.
    • If more than the specified value repair open or high resistance on the mono out circuit.
  5. Test for less than 1 ohm between the X2 VCIM connector terminal 2 and the radio X2 connector terminal 15.
    • If more than the specified value repair open or high resistance on the low reference circuit.
  6. If all circuits test normal, replace the VCIM.
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