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Home >> Alfa Romeo >> 2019 >> Giulia Base, AWD >> Repair and Diagnosis >> Body & Frame >> Aerodynamic Devices >> (Active Aerodynamic Module Right (AAMR) - Electrical Diagnostics) >> DTC Troubleshooting >> U1200-08-Smart Actuator Private Can Bus - Bus Signal - Message Failure >> Diagnostic Test

Diagnostic Test

  1. CHECK FOR AN ACTIVE DTC 
    1. Perform any Service Bulletins that may apply.
    2. Turn the ignition on.
    3. With the scan tool, read Active Aerodynamics Module Right (AAMR) DTCs and record on the repair order.
    4. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
    5. With the scan tool, erase AAMR DTCs.
    6. Cycle the ignition from off to on.
    7. With the scan tool, read AAMR DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

  2. CHECK THE ACTIVE AERODYNAMIC MODULE RIGHT (AAMR) CONNECTOR/TERMINAL FOR DAMAGE 
    NOTE:

    Check all terminals for broken, bent, pushed out, or corroded terminals.

    1. Turn the ignition off.
    2. Disconnect the AAMR harness connector.
    3. Disconnect the PDC Front harness connector.
    4. Check for loose, damaged or corroded connections on the front left spoiler.

      Were any problems found?

      Yes 

      No 

      • Go To  3
  3. (D468) PRIVATE CAN (-) CIRCUIT SHORTED TO VOLTAGE 
    1. Disconnect the AAML harness connector.
    2. Turn the ignition on.
    3. Measure the voltage of the (D468) Private Can (-) circuit at the AAMR harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (D468) Private Can (-) circuit for a short to voltage.
      • Perform the EPB VERIFICATION TEST. Refer to EPB VERIFICATION TEST .

      No 

      • Go To  4
  4. (D468) PRIVATE CAN (-) CIRCUIT SHORTED TO GROUND 
    1. Turn the ignition off.
    2. Measure the resistance between the (D468) Private Can (-) circuit and ground.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Repair the (D468) Private Can (-) circuit for a short to ground.
      • Perform the EPB VERIFICATION TEST. Refer to EPB VERIFICATION TEST .

      No 

      • Go To  5
  5. (D468) PRIVATE CAN (-) CIRCUIT OPEN OR HIGH RESISTANCE 
    1. Measure the resistance of the (D468) Private Can (-) circuit between the Parking Brake Switch harness connector and the EPB Module harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (D468) Private Can (-) circuit for an open or high resistance.
      • Perform the EPB VERIFICATION TEST. Refer to EPB VERIFICATION TEST .
  6. (D469) PRIVATE CAN (+) CIRCUIT SHORTED TO VOLTAGE 
    1. Turn the ignition on.
    2. Measure the voltage of the (D469) Private Can (+) circuit at the AAMR harness connector.

      Is there any voltage present?

      Yes 

      • Repair the (D469) Private Can (+) circuit for a short to voltage.
      • Perform the EPB VERIFICATION TEST. Refer to EPB VERIFICATION TEST .

      No 

      • Go To  7
  7. (D469) PRIVATE CAN (+) CIRCUIT SHORTED TO GROUND 
    1. Turn the ignition off.
    2. Measure the resistance between the (D469) Private Can (+) circuit and ground.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Repair the (D469) Private Can (+) circuit for a short to ground.
      • Perform the EPB VERIFICATION TEST. Refer to EPB VERIFICATION TEST .

      No 

      • Go To  8
  8. (D469) PRIVATE CAN (+) CIRCUIT OPEN OR HIGH RESISTANCE 
    1. Measure the resistance of the (D469) Private Can (+) circuit between the Parking Brake Switch harness connector and the EPB Module harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  9

      No 

      • Repair the (D469) Private Can (+) circuit for an open or high resistance.
      • Perform the EPB VERIFICATION TEST. Refer to EPB VERIFICATION TEST .
  9. CHECK RELATED HARNESS CONNECTIONS 
    1. Turn the ignition off.
    2. Disconnect the AAMR harness connector.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. 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.

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

      Did the DTC return?

      Yes 

      • Replace the Active Aerodynamics Module Right (AAMR) in accordance with the Service Information.
      • Perform AAM VERIFICATION TEST. Refer to AAM VERIFICATION TEST  .

      No 

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