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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L - DTCS B1810-00 To P0111-00 >> DTC Troubleshooting >> B25CB-00-Driver Door Ajar Switch 1/Driver Door Ajar Switch 2 Correlation >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
    2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
    3. With the scan tool, erase all DTCs.
    4. Turn the ignition off for a minimum of 10.0 seconds.
    5. Turn the ignition on.
    6. Verify that the Driver Door is closed completely and test drive the vehicle above 5.0 mph.
    7. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

  2. CHECK THE VEHICLE SPEED SENSOR SIGNAL 
    1. Test drive the vehicle.
    2. Perform several stop and go events.
    3. With the scan tool, monitor the vehicle speed signal input.

      Does the vehicle speed drop to zero and hold consistently when the vehicle is stopped?

      Yes 

      • Go To  3

      No 

      • Diagnose the faulty vehicle speed input. Check for any service bulletins that may apply.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  3. VISUALLY CHECK THE DRIVER DOOR LATCH ASSEMBLY 
    1. Inspect the Driver Door Latch for obstructions or damage that could hinder proper operation.

      Was any damage found to the Driver Door Latch?

      Yes 

      No 

      • Go To  4
  4. CHECK FOR HIGH RESISTANCE IN THE (G75) DRIVER DOOR AJAR SWITCH SENSE CIRCUIT 
    1. Turn the ignition off.
    2. Disconnect the Driver Door Latch Assembly harness connector.
    3. Disconnect the BCM C6 harness connector.
    4. Measure the resistance of the (G75) Driver Door Ajar Switch Sense circuit between the Driver Door Latch Assembly harness connector and the BCM C6 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  5

      No 

      • Repair the (G75) Driver Door Ajar Switch Sense circuit for high resistance.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  5. CHECK FOR HIGH RESISTANCE IN THE (G755) DRIVER DOOR SECONDARY AJAR SWITCH CIRCUIT 
    1. Measure the resistance of the (G755) Driver Door Secondary Ajar Switch circuit between the Driver Door Latch Assembly harness connector and the BCM C6 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (G755) Driver Door Secondary Ajar Switch circuit for high resistance.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  6. CHECK THE ABILITY OF THE BCM TO READ THE SECONDARY DOOR AJAR SWITCH SIGNAL 
    1. Turn the ignition on.
    2. Connect a jumper between the (G75) Driver Door Ajar Switch circuit and Ground at the Driver Door Latch Assembly harness connector.
    3. With the scan tool, read DTCs.
      NOTE:

      The scan tool should display the B1810-DRIVER DOOR AJAR CIRCUIT LOW DTC with the jumper in place?

    4. Connect a jumper between the (G755) Driver Door Secondary Ajar Switch circuit and Ground at the Driver Door Latch Assembly harness connector.
    5. With the scan tool, read DTCs.
      NOTE:

      The scan tool should display the B25C7-SECONDARY DRIVER DOOR AJAR CIRCUIT LOW DTC with the jumper in place?

      Does the scan tool display as described above?

      Yes 

      No 

      • Go To  7
  7. CHECK RELATED BCM AND COMPONENT CONNECTIONS 
    1. Disconnect all BCM 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.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    5. Reconnect all BCM 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. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    10. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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