Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b2240 can communication (audio) stuck

Subaru Legacy BN/BS (2015-2019) Service Manual / Infotainment system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b2240 can communication (audio) stuck

DTC DETECTING CONDITION:

Detected when the resistor is stuck during the CAN bus communication process.

TROUBLE SYMPTOM:

Screen display does not link with combination meter or vehicle.

STEP	CHECK	YES	NO
1.CHECK DTC. Inspect LAN system. Basic Diagnostic Procedure > PROCEDURE	Is there any fault-	Perform the diagnosis according to diagnosis for LAN system.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2240 CAN COMMUNICATION (AUDIO) STUCK
2.CHECK NAVIGATION UNIT. 1) Perform the Clear Memory Mode. Clear Memory Mode 2) Turn the ignition switch to OFF > ON. 3) Read the DTC again. Read Diagnostic Trouble Code (DTC)	Is DTC B2240 displayed- (Current malfunction)	Replace the audio (7-inch display) or navigation unit. Audio Navigation Body	Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again. NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

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Other materials:

Inspection
1. CHECK THE MASS AIR FLOW SENSOR UNIT1. Connect the battery positive terminal to terminal No. 3 and the battery ground terminal to terminal No. 4, and connect the circuit tester positive terminal to terminal No. 5 and the circuit tester ground terminal to terminal No. 4.2. Check the voltage changes ...