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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Body Control Module (BCM) - DTCS B1000-44 To B1072-71 >> DTC Troubleshooting >> B105D-64-Deadlock Relay/Unlock Driver Door Relay-Signal Plausibility Failure >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    1. With the scan tool, read Body Control Module (BCM) DTCs and record on the repair order.
    2. Record the Environmental Data and any DTCs.
    3. With the scan tool, erase DTCs.
    4. Using the recorded Environmental Data, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
    5. With the scan tool, read BCM DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (D512) LIN BUS DOOR SW MOD RTN CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the BCM C6/F harness connector.
    3. Disconnect the Interior Driver Door Handle Switch harness connector.
    4. Turn the ignition on.
    5. Measure the voltage on the (D512) LIN Bus Door Sw Mod Rtn circuit at the Interior Driver Door Handle Switch harness connector.

      Is there any voltage present?

      Yes 

      • Repair the short to voltage on the (D512) LIN Bus Door Sw Mod Rtn circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE (D512) LIN BUS DOOR SW MOD RTN CIRCUIT FOR AN OPEN OR HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Measure the resistance on the (D512) LIN Bus Door Sw Mod Rtn circuit between the Interior Driver Door Handle Switch and BCM C6/F harness connector - terminal 14.

      Is the resistance above 3.0 Ohms?

      Yes 

      • Repair the open circuit or high resistance on the (D512) LIN Bus Door Sw Mod Rtn circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (D512) LIN BUS DOOR SW MOD RTN CIRCUIT FOR A SHORT TO GROUND 
    1. Check for continuity between ground and the (D512) LIN Bus Door Sw Mod Rtn circuit at the Interior Driver Door Handle Switch harness connector.

      Is there continuity between ground and the (D512) LIN Bus Door Sw Mod Rtn circuit?

      Yes 

      • Repair the short ground on the (D512) LIN Bus Door Sw Mod Rtn circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Replace the Interior Driver Door Handle Switch in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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