Inspection steps

WARNING: This page is about a different car, the 2018 Subaru BRZ. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Perform all of steps to Step 9 in "How to troubleshoot" before performing this steps. (Refer to HOW TO TROUBLESHOOT )

Check DTC
1. Check the displayed DTC.
  Criteria: DTCs other than U**** are not output
NO: Perform the diagnosis according to the DTC.

YES: Go to next step
DTC check
1. Check the displayed DTC.
  Criteria: No DTC indicating bus off or missing data is output
NO: Perform the diagnosis according to the DTC.

YES: Go to next step
DTC check
1. Check the displayed DTC.
  Criteria: U0422 is output
NO: Go to "How to simulate trouble phenomenon" (Refer to MALFUNCTION SYMPTOMS AND DTC CHECK )

YES: Go to next step
DTC check
1. Turn the ignition switch to OFF.
2. Disconnect the body integrated unit connector.
3. Reconnect the disconnected connector and turn the ignition switch ON.
4. Use SSM4 to read DTC.
  Criteria: U0422 is output
NO: Go to "How to simulate trouble phenomenon" (Refer to MALFUNCTION SYMPTOMS AND DTC CHECK )

YES: Go to next step
DTC check
1. Use SSM4 to read DTCs of all the systems.
  Criteria: U0422 is not detected from more than one module
NO: Replace the body integrated unit.

YES: Go to next step
Replacement of the module
1. Replace the body integrated unit.
2. Use SSM4 to read DTC.
  Criteria: U0422 is output
NO: System is normal.

YES: Go to next step
Replacement of the module
1. Reinstall the body integrated unit.
2. Replace the module that DTC has been detected.
3. Use SSM4 to read DTC.
  Criteria: U0422 is output
NO: System is normal.

YES: Go to next step

Replace the body integrated unit.