2020 Subaru Outback BaseFACTORY OEM SERVICE PROCEDURE

Front Relay Control Module DTCS

FRONT RELAY CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION

DTC Reference
B1A00 Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A00 FRONT RELAY CONTROL MODULE NON-VOLATILE MEMORY .
B1A01 Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A01 FRONT RELAY CONTROL MODULE BATTERY(CONTROL) POWER SUPPLY .
B1A02 Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A02 FRONT RELAY CONTROL MODULE BATTERY(BUCK UP) POWER SUPPLY .
B1A03 Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A03 FRONT RELAY CONTROL MODULE IG POWER SUPPLY .
B1A04 Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A04 HEAD LAMP LO LH CIRCUIT CURRENT HIGH .
B1A06 Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A06 HEAD LAMP LO RH CIRCUIT CURRENT HIGH .
B1A08 Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A08 HEAD LAMP HI LH CIRCUIT CURRENT HIGH .
B1A0A Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A0A HEAD LAMP HI RH CIRCUIT CURRENT HIGH .
B1A0C Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A0C FRONT RELAY CONTROL MODULE CAN REGISTER STUCK .
U0074 Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0074 CONTROL MODULE COMMUNICATION BUS "BODY-CAN" OFF .
U0122 Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0122 LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE .
U0140 Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE .
U0416 Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0416 INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE .
U0422 Ref. to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE .
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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