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Home >> Fiat >> 2018 >> 500 Lounge, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 44 (Body Control Module (BCM) - DTCS B106A-19 To B2229-62 - 500 - Electric) >> DTC Troubleshooting >> B16AF-18-Left Stop Lamp Control - Under Current >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, clear all DTCs.
    3. Apply the Brake Pedal several times.
    4. With the scan tool, read DTCs.

      Does the scan tool display this DTC as active?

      Yes 

      • Go To  2

      No 

      • Test complete. The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  2. CHECK THE LEFT STOP LAMP BULB FOR AN OPEN, POOR CONNECTION OR AN INCORRECT PART NUMBER 
    1. Turn the ignition off.
    2. Remove the Left Stop Lamp Bulb from the Left Tail Lamp Assembly.
    3. Inspect the Left Stop Lamp Bulb for an open, poor connection or an incorrect part number.

      Are there any problems found with the Left Stop Lamp Bulb?

      Yes 

      No 

      • Install the Left Stop Lamp Bulb and Go To  3
  3. CHECK THE (Z941) GROUND CIRCUIT FOR AN OPEN OR HIGH RESISTANCE 
    1. Disconnect the Left Tail Lamp Assembly harness connector.
    2. Measure the resistance of the (Z941) Ground circuit between ground and the Left Tail Lamp Assembly harness connector.

      Is the resistance above 3.0 Ohms?

      Yes 

      • Repair the open or high resistance in the (Z941) Ground circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE BCM FOR CORRECT OPERATION 
    1. Connect a 12-volt test light between the (L52) Left Stop Lamp Driver circuit and the (Z941) Ground circuit at the Left Tail Lamp Assembly harness connector.
    2. Turn the ignition on.
    3. Apply the Brake Pedal.

      Does the test light illuminate brightly?

      Yes 

      • Check the Left Tail Lamp Assembly harness connector(s) for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. If no problems are found, replace the Left Tail Lamp Assembly in accordance with the Service Information. Refer to LAMP, TAIL STOP TURN, REMOVAL .
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE (L52) LEFT STOP LAMP DRIVER CIRCUIT FOR AN OPEN OR HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the BCM C3 harness connector.
    3. Measure the resistance of the (L52) Left Stop Lamp Driver circuit between the Left Tail Lamp Assembly harness connector and the BCM C3 harness connector.

      Is the resistance above 3.0 Ohms?

      Yes 

      • Repair the open or high resistance in the (L52) Left Stop Lamp Driver circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Check the BCM harness connector(s) for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension. If no problems are found, replace the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL (BCM), REMOVAL .
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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