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Circuit/System Verification

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the scan tool Headlamps On Switch parameter changes between Active and Inactive while commanding the headlamp ON and OFF with the headlamp switch.
    • If the parameter does not change 

      Refer to Headlamp Switch Malfunction.

    • Go to next step: If the parameter changes 
  3. Verify the scan tool Automatic Headlamps Disable Switch parameter changes between Active and Inactive while commanding the automatic lamp control ON and OFF with the headlamp switch.
    • If the parameter does not change 

      Refer to Headlamp Switch Malfunction.

    • Go to next step: If the parameter changes 
  4. Verify the scan tool Headlamps Flash Switch parameter changes between Active and Inactive while commanding the flash to pass ON and OFF with the turn signal/multifunction switch.
    • If the parameter does not change 

      Refer to Turn Signal/Multifunction Switch Malfunction.

    • Go to next step: If the parameter changes 
  5. Verify the scan tool High Beam Select Switch parameter changes between Active and Inactive while commanding the high beams ON and OFF with the turn signal/multifunction switch.
    • If the parameter does not change 

      Refer to Turn Signal/Multifunction Switch Malfunction.

    • Go to next step: If the parameter changes 
  6. Verify the ow beam headlamp turn ON and OFF when commanding the Low Beam Lamps ON and OFF with a scan tool.
    • If the low beam headlamps do not turn ON and OFF 

      Refer to Headlamps Malfunction - Low Beam.

    • Go to next step: If the low beam headlamps turn ON and OFF 
  7. Verify the high beams turn ON and OFF when commanding the Low Beam Lamps ON and OFF with a scan tool.
    • If the high beams do not turn ON and OFF 

      Refer to Headlamps Malfunction - High Beam.

    • Go to next step: If the high beams turn ON and OFF 
  8. Verify the high beam indicator on the instrument cluster turns ON and OFF while commanding the All Indicators Test ON and OFF with a scan tool.
    • If the high beam indicator does not turn ON and OFF 

      Refer to High Beam Indicator Malfunction.

    • Go to next step: If the high beam indicator turns ON and OFF 
    9. NOTE:
    • Vehicles equipped with RPO CE1 use the B200 Rain Sensor Module for ambient light status. Vehicles without RPO CE1 use the B10B Ambient Light/Sunload Sensor for ambient light status.
    • Placing a towel over the ambient light sensor can simulate a dim light condition and shining an incandescent light at the ambient light sensor can simulate a bright light condition.
  9. Verify the scan tool Ambient Light Status parameter changes while switching from dim to bright ambient light conditions
    • If the parameter does not change and the vehicle is equipped with RPO CE1 

      Refer to Rain Sensing Module Malfunction.

    • If the parameter does not change and the vehicle is not equipped with RPO CE1 

      Refer to Ambient Light Sensor Malfunction.

    • Go to next step: If the parameter changes and the automatic headlamps turn ON and OFF 
  10. All OK.
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