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Home >> Buick >> 2019 >> Envision Base >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Driver Assistance Systems >> Diagnostic Information and Procedures >> DTC B0987 >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON.
  2. Verify DTC B356A is not set.
    • Go to next step: If the DTC is not set 
  3. Verify the lane departure warning indicator turns ON and OFF while pressing and releasing the lane departure warning switch.
    • If the indicator does not turn ON and OFF 

      Refer to Circuit/System Testing.

    • Go to next step: If the indictor turns ON and OFF 
  4. All OK.
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