2016 Buick EnvisionFACTORY OEM SERVICE PROCEDURE

Circuit/System Verification

WARNING: This page is about a different car, the 2016 Buick LaCrosse. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the scan tool can communicate with the B218L Side Object Sensor Module - Left.
    • If the scan tool cannot communicate with the B218R Side Object Sensor Module - Right 

      Refer to Circuit/System Testing - Left Side Object Sensor Malfunction.

    • If the scan tool can communicate with the B218L Side Object Sensor Module - Left 
  3. Verify DTC U18A6 is not present
    • If DTC U18A6 is not present 
  4. Ignition OFF, ignition ON.
  5. Verify that both side blind zone alert system indicators located in the outside rearview mirrors briefly turn ON and then turn OFF during the system self test.
    • If both side blind zone alert indicators do not briefly turn ON and OFF 
    1. Verify the system is enabled
      • If disabled, refer to Diagnostic Aids for cause of disable.
      • If enabled, refer to Circuit/System Testing - Side Object Indicator Malfunction.
    • If only one indicator does not briefly illuminate during the self test 

      Refer to Circuit/System Testing - Side Object Indicator Malfunction.

    • If both side blind zone alert indicators briefly turn ON and OFF 
  6. All OK.
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.