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Circuit/System Verification

WARNING: This page is about a different car, the 2011 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool Right Turn Signal Switch and Left Turn Signal Switch parameters while cycling the turn signal switch between the right and left positions. The readings should change between Active and Inactive.
    • If the parameters do not change between the commanded states, refer to Turn Signal/Multifunction Switch Malfunction in Circuit/System Testing .
  2. Observe the right and left turn signal lamps while cycling the turn signal switch between the right and left positions. The front and rear turn signal lamps should turn ON and OFF.
    • If the front or rear turn signal lamps do not turn ON and OFF, refer to Turn Signal Lamps Malfunction in Circuit/System Testing .
  3. Observe the right and left outside rearview mirror turn signal indicators while cycling the turn signal switch between the right and left positions. The right and left outside rearview mirror turn signal indicators should turn ON and OFF.
    • If the outside rearview mirror turn signal indicators do not turn ON and OFF, refer to Outside Rearview Mirror Turn Signal Indicator Malfunction in Circuit/System Testing .
  4. Observe the left and right turn signal lamps and turn signal indicators on the instrument panel while cycling the turn signal switch between the right and left positions. 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 Tail Lamp Outage Detection Malfunction in Circuit/System Testing .
  5. Command the Display Test ON and OFF with a scan tool. The left and right turn signal indicators should turn ON and OFF when changing between the commanded states.
    • If the left and right turn signal indicators illuminate during the test, replace the BCM.
    • If the left and right turn signal indicators do not illuminate during the test or remain illuminated at all times, replace the instrument cluster.
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