Removal Procedure

Important:  The vehicle communication unit (VCU) has a specific set of unique numbers that tie the module to each vehicle. These numbers, the 10-digit station identification and the 11-digit electronic serial number, are used by the National Cellular Network and OnStar® to identify the specific vehicle. Because these numbers are tied to the vehicle identification number of the vehicle, you must never exchange these parts with those of another vehicle.

1. Open the rear compartment.
2. Remove the cover from the OnStar® vehicle communication unit (VCU) by depressing the retainer tabs.
   Fig 1: Removing Cover From OnStar® Vehicle Communication Unit

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3. Remove the cellular coaxial cable from the VCU by pulling off.
   Fig 2: Removing Cellular Coaxial Cable From Vehicle Communication Unit

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4. Remove the screws from the DB-25 connector.
   Fig 3: Removing Screws From DB-25 Connector

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5. Remove the DB-25 connector from the VCU.
   Fig 4: Removing DB-25 Connector From Vehicle Communication Unit

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6. Release the retainer strap from the VCU using a small flat-bladed tool.
7. Remove the VCU from the rear compartment.
   Fig 5: Releasing Retainer Strap From Vehicle Communication Unit

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