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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 274 (Lighting System - DTC B3891 To DTC C0297 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Turn Signal Lamps and/or Indicators Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the scan tool Right Turn Signal Switch and Left Turn Signal Switch parameters change between Active and Inactive while cycling the turn signal switch between the right and left positions.
    • If the parameters do not change 

      Refer to Turn Signal/Multifunction Switch Malfunction.

    • If the parameters change 
  3. Verify the left front turn signal lamps turn ON and OFF while commanding the Left Front Turn Signal Lamp ON and OFF with a scan tool.
    • If the left front turn signal lamps do not turn ON and OFF 

      Refer to Turn Signal Lamps Malfunction.

    • If the left front turn signal lamps turn ON and OFF 
  4. Verify the right front turn signal lamps turn ON and OFF while commanding the Right Front Turn Signal Lamp ON and OFF with a scan tool.
    • If the right front turn signal lamps do not turn ON and OFF 

      Refer to Turn Signal Lamps Malfunction.

    • If the right front turn signal lamps turn ON and OFF 
  5. Verify the left rear turn signal lamp turns ON and OFF while commanding the Left Rear Turn Signal/Stop Lamp ON and OFF with a scan tool.
    • If the left rear turn signal lamp does not turn ON and OFF 

      Refer to Turn Signal Lamps Malfunction.

    • If the left rear turn signal lamp turns ON and OFF 
  6. Verify the right rear turn signal lamp turns ON and OFF while commanding the Right Rear Turn Signal/Stop Lamp ON and OFF with a scan tool.
    • If the right rear turn signal lamp does not turn ON and OFF 

      Refer to Turn Signal Lamps Malfunction.

    • If the right rear turn signal lamp turns ON and OFF 
  7. Observe the left and right turn signal lamps and turn signal indicators on the instrument cluster while activating the left and right turn signals. The left and right turn signal lamps and indicators should illuminate and flash at a normal rate when turned ON.
    • If the left and right turn signal lamps and indictors illuminate but flash in a rapid manner 

      Refer to Turn Signal Lamp Outage Detection Malfunction.

    • If the left and right turn signal lamps and indictors operate normally 
  8. All OK.
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