2021 GMC Yukon AT4FACTORY OEM SERVICE PROCEDURE

Replace and Program Control Module or Reprogram Control Module

To configure a K85P Restraints Occupant Classification System Module - Passenger, perform the following procedure:

    NOTE:
    • Before ROCSM Programing and Setup can be conducted, the front passenger seat must be completely empty of all items. The presence of any liquid or items on the front passenger seat will affect the calibration and operation of the ROCSM.
    • DTC U3000.99 will set if the re-zero system test is performed with:
      • An aftermarket seat heater located too close to the sensor mat
      • A scan tool, laptop or other electronic device is in the seat.
      • The seat is damp or wet
      • An object or person is in the seat
  1. Verify that the temperature is between 32Β°F (0Β°C) to 100Β°F (38 Β°C).
  2. Verify the seat is completely dry.
  3. Empty the front outboard passenger seat.
  4. Verify that all SIR and ROCSM components, connectors, and connector position assurances are properly connected and mounted.
  5. Access the Service Programming System (SPS) and follow the on-screen instructions
  6. On the SPS Supported Controllers screen, K85P Restraints Occupant Classification System Module - Passenger - Programming and follow the on-screen instructions
  7. On the SPS Supported Controllers screen, K85P Restraints Occupant Classification System Module - Passenger - Setup and follow the on-screen instructions
  8. Clear DTCs
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:

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

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