Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2016 Subaru WRX BaseFACTORY OEM SERVICE PROCEDURE
Section 9 (Body Control System (Diagnostics))
WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.
- Basic Diagnostic Procedure
- Check List for Interview
- General Description
- Electrical Component Location
- Control Module I/O Signal
- Inspection Mode
- Diagnostic Procedure for Subaru Select Monitor Communication
- Data Monitor
- Freeze Frame Data
- Active Test
- Customize
- Registration Body Integrated Unit
- Diagnostic Trouble Code (DTC)
- Diagnostic Procedure with Diagnostic Trouble Code (DTC)
- DTC B1010: Body Control System (BIU) Malfunction
- DTC B1011: Battery Control Power Supply
- DTC B1012: Battery Backup Power Supply
- DTC B1013: Ignition Power
- DTC B1014: Acc Power
- DTC B1015: Key Interlock Circuit
- DTC B1016: Shift Lock Circuit
- DTC B1017: Collision Detection Signal Input
- DTC B1107: Control Module Communication Sticking
- DTC B1402: Immobilizer Key Collation
- DTC B1403: Immobilizer Sub Control Module Collation
- DTC B1404: Immobilizer Sub Control Module Communication
- DTC B140A: Immobilizer Sub Control Module Non-Volatile Memory
- DTC B1410: Transponder Communication
- DTC B1411: Immobilizer Antenna
- DTC B2680: High Beam Assist Sensor
- DTC B2681: High Beam Assist Control Module
- DTC B2682: High Beam Assist Unit Field Of View
- DTC B2683: Vehicle Specification Information Registration
- DTC U0073: Control Module Communication Bus Off
- DTC U0074: Control Module Communication Bus "Body-Can" Off
- DTC U0100: Lost Communication With ECM/Pcm "A"
- DTC U0101: Lost Communication With TCM
- DTC U0122: Lost Communication With Vehicle Dynamics Control Module
- DTC U0127: Lost Communication With Tire Pressure Monitor Control Module And/Or Keyless Entry Control Module
- DTC U0128: Lost Communication With Park Brake Control Module
- DTC U0141: Lost Communication With Body Control Module "A"
- DTC U0155: Lost Communication With Instrument Panel Cluster (IPC) Control Module
- DTC U0164: Lost Communication With HVAC Control Module
- DTC U0167: Lost Communication With Immobilizer Control Module
- DTC U0169: Lost Communication With Sunroof Control Module
- DTC U0222: Lost Communication With Driver's Door Power Window
- DTC U0223: Lost Communication With Passenger's Door Power Window
- DTC U0224: Lost Communication With RR Door Power Window
- DTC U0225: Lost Communication With RL Door Power Window
- DTC U0327: Software Incompatibility With Vehicle Security Control Module
- DTC U0401: Invalid Data Received From ECM/Pcm "A"
- DTC U0402: Invalid Data Received From TCM
- DTC U0416: Invalid Data Received From Vehicle Dynamics Control Module
- DTC U0417: Invalid Data Received From Park Brake Control Module
- DTC U0423: Invalid Data Received From Instrument Panel Cluster Control Module
- DTC U0424: Invalid Data Received From HVAC Control Module
- DTC U0426: Invalid Data Received From Immobilizer Control Module
- DTC U0427: Invalid Data Received From Vehicle Security Control Module
- DTC U0430: Invalid Data Received From Tire Pressure Monitor Control Module And/Or Keyless Entry Control Module
- DTC U0431: Invalid Data Received From Body Control Module "A"
- DTC U111F: <HBA>Lost Communication With Vehicle Dynamics Control Module
- DTC U1145: <HBA>Lost Communication With Body Control Module
- DTC U115A: <HBA>Lost Communication With Instrument Panel Cluster (IPC) Control Module
- DTC U123C: Lost Communication With High Beam Assist Control Module
- DTC U1283: Lost Communication With Eyesight SA-Bus
- DTC U141A: <HBA>Invalid Data Received From Vehicle Dynamics Control Module
- DTC U142A: <HBA>Invalid Data Received From Instrument Panel Cluster (IPC) Control Module
- DTC U1446: <HBA>Invalid Data Received From Body Control Module
- DTC U153D: Invalid Data Received From High Beam Assist Control Module
- DTC U1584: Invalid Data Received From Eyesight SA-Bus
- DTC U1673: Lin Communication Bus Error Body Control Module
- DTC U1674: Lin Communication Bus 2 Error Body Control Module
- DTC U1678: Lin Communication Bus 4 Error Body Control Module
- DTC U1781: Lost Communication With LDM RH Module
- DTC U178A: Lost Communication With LDM LH Module
- DTC U1822: Lost Communication With Master Main Switch
- General Diagnostic Table
- Diagnostics with Phenomenon
- List
- Inspection
- HIGH BEAM ASSIST INDICATOR DOES NOT ILLUMINATE (EyeSight HBA)
- THE LIGHTING DOES NOT SWITCH FROM LOW BEAM TO HIGH BEAM AUTOMATICALLY (EyeSight HBA)
- THE LIGHTING DOES NOT SWITCH FROM HIGH BEAM TO LOW BEAM AUTOMATICALLY (EyeSight HBA)
- High Beam Assist Indicator Does Not Illuminate (Mirror HBA)
- High Beam Light Does Not Turn On Automatically (Mirror HBA)
- High Beam Light Does Not Go Off Automatically (Mirror HBA)
- Suspend State Is Not Released (Mirror HBA)
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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