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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Collision/Avoidance >> (Left Blind Spot Sensor Module (BSM) (LBSS) - Electrical Diagnostics) >> DTC Troubleshooting >> C100B-11-Left Blind Spot Sensor - Circuit Short To Ground >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, create a Vehicle Scan Report and attach it to the repair order.
    3. With the scan tool, read the Left Blind Spot Sensor (LBSS) DTCs.

      Is the DTC active?

      Yes 

      • Go to 2.

      No 

  2. CHECK LEFT BLIND SPOT SENSOR CONNECTION 
    1. Turn the ignition off.
    2. Check that the connections on the Left Blind Spot Sensor and the left rear-view mirror are not faulty, loose or damaged.

      Are there any loose or damaged connections?

      Yes 

      • Repair the wiring connections as necessary.

      No 

      • Go to 3.
  3. CHECK THE (P711) LEFT BLIND SPOT INDICATOR DRIVER CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the (P711) Left Blind Spot Indicator Driver circuit at the LBSS harness connector.

      Is there continuity between ground and the (P711) Left Blind Spot Indicator Driver circuit?

      Yes 

      • Repair the (P711) Left Blind Spot Indicator Driver circuit for a short ground.

      No 

      • Go to 4.
  4. CHECK RELATED HARNESS CONNECTIONS 
    1. Disconnect all LBSS Module harness connectors.
    2. Disconnect all related in-line harness connections (if equipped).
    3. Disconnect the related component harness connectors.
    4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Perform a terminal drag test on each connector terminal to verify proper terminal tension.

      Repair any conditions that are found.

    5. Reconnect all LBSS Module harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. With the scan tool, erase DTCs.
    9. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    10. With the scan tool, read LBSS Module DTCs.

      Did the DTC return?

      Yes 

      No