2003 Chevrolet Impala LSFACTORY OEM SERVICE PROCEDURE

Installation Procedure

    Fig 1: Communication Interface Module (Generation 4)
    GM813770Courtesy of GENERAL MOTORS CORP.
  1. When replacing a generation 4 VCIM, perform the following steps:
    1. Record the 11-digit electronic serial number (ESN) and the 10-digit station identification (STID) number from the label on the new VCIM.
    2. Align the connector side of the module to the large cutout on the plastic bracket. Insert the module into the plastic bracket. Make sure the small GPS connector is inserted into the small round hole in the plastic bracket.
    2. Fig 2: Plastic Bracket Assembly & Module (Generation 4)
    GM813771Courtesy of GENERAL MOTORS CORP.
  2. When replacing a generation 4 module, perform the following steps:
    1. Spread the large tang side of the plastic bracket over the edge of the module. The bottom, undercut edge of the plastic bracket will snap over the bottom of the module when fully seated.
    2. The connectors on the module must be outboard. Slide the plastic bracket assembly outboard, under the metal bracket.
    3. Engage the outboard plastic tabs to the outboard edge of the metal bracket.
    4. Squeeze the plastic bracket assembly upward until the large, plastic snap-fingers engage on the inboard edge of the metal bracket.
    3. Fig 3: Communication Interface Module (Generation 5)
    GM903662Courtesy of GENERAL MOTORS CORP.
  3. When replacing a generation 5 module, perform the following steps:
    1. Record the 11-digit electronic serial number (ESN) and the 10-digit station identification (STID) number from the label on the new VCIM.
    2. Position the communication interface module to the bracket.
    4. Fig 4: Communication Interface Module Bolt (Generation 5)
    GM903659Courtesy of GENERAL MOTORS CORP.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.