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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 181 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESNO (OR NOISY) ONSTAR AUDIOCIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Circuit/System Testing

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

No OnStar® Audio

  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.

Noisy OnStar® Audio

  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.
RENDER: 1.0x

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