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Home >> Subaru >> 2022 >> WRX Premium, Automatic CVT Trans >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Front Relay Control Module (Diagnostics) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC U0074: Control Module Communication Bus "Body-Can" Off
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DTC U0074: Control Module Communication Bus "Body-Can" Off

DTC detecting condition: 

When the IGN power supply voltage becomes equal to or larger than 10 V continuously for 1 second, CAN controller information bus-off continues for 0.5 seconds or more.

Trouble symptom: 

The headlight High does not illuminate.

NOTE:

Perform the diagnosis for LAN system. Ref. to  LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE