Subaru Legacy BN/BS (2015-2019) Service Manual: Communication for initializing impossible

Subaru Legacy BN/BS (2015-2019) Service Manual / Lan system (diagnostics) / Subaru select monitor / Communication for initializing impossible

DIAGNOSIS:

Subaru Select Monitor communication line is open or shorted.

TROUBLE SYMPTOM:

Not communicable with Subaru Select Monitor.

WIRING DIAGRAM:

CAN communication system CAN Communication System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK SUBARU SELECT MONITOR. 1) Connect the Subaru Select Monitor to another vehicle. 2) Check communication condition between Subaru Select Monitor and vehicle.	Is communication performed normally-	Subaru Select Monitor > COMMUNICATION FOR INITIALIZING IMPOSSIBLE	Subaru Select Monitor unit or diagnosis cable is faulty. Or check the fuse on the vehicle side.
2.CHECK COMMUNICATION FOR INITIALIZING ERROR. Perform the communication for initializing with each module by connecting the Subaru Select Monitor. (For systems whose module can communicate with diagnostic devices) NOTE: By performing «Confirmation of CAN bus connection to ECU(MainBus)», confirmation of minimal connection modules is possible. CAN BUS ECU Communication Check	Is the communication possible with all modules-	Subaru Select Monitor > COMMUNICATION FOR INITIALIZING IMPOSSIBLE	Perform the inspection using the check sheet of communication for initializing. Subaru Select Monitor > COMMUNICATION FOR INITIALIZING IMPOSSIBLE
3.CHECK DATA LINK CONNECTOR. Use a tester to check for continuity in the ground circuit. Connector & terminal (B40) No. 4 — Chassis ground: (B40) No. 5 — (B134) No. 53:	Is there continuity-	Subaru Select Monitor > COMMUNICATION FOR INITIALIZING IMPOSSIBLE	Repair or replace the open circuit.
4.CHECK DATA LINK CONNECTOR. 1) Turn the ignition switch to ON. 2) Using a tester, check the power supply of data link connector. Connector & terminal (B40) No. 8 (+) — Chassis ground (−): (B40) No. 16 (+) — Chassis ground (−):	Is the voltage 10 V or more-	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.	Check the power supply circuits to the data link connector.

1. CHECK USING THE CHECK SHEET OF COMMUNICATION FOR INITIALIZING

• Network diagram

• Check sheet of communication for initializing

(A)	Installation check	ECM: Engine CM	AHL: Auto headlight beam leveler CM or steering responsive fog light CM
(B)	Communication initialization	VDC: VDC CM	RES: Remote engine starter CM
(C)	Wiring location	EPS: Power steering CM	AVN: Audio or navigation unit
		TCM: Transmission CM	IMB: Immobilizer CM
		RDR: Radar sensor	KPS: Keyless access CM
		A/C: Air conditioner CM	IMP: Impact sensor
		A/B: Airbag CM	MET: Combination meter
		STA: Steering angle sensor	DCM(M): Data communication module (MAIN CAN)
		EYE: Stereo camera	DCM(B): Data communication module (BODY CAN)
		BIU: Body integrated unit

1. Module installation check

(1) Write “-” marks in the field for installation check if the vehicle to be inspected does not have relevant module.

(2) Write “-” marks in all blank fields on the same row that the “-” mark has filled in.

NOTE:

Example of writing Subaru Select Monitor > COMMUNICATION FOR INITIALIZING IMPOSSIBLE

2. Subaru Select Monitor communication initialization check

(1) Write “” marks in the field for communication initialization if the module succeeded in the communication for initializing with Select Monitor.

If the communication with all modules is not possible, go to 3).

(2) Write “” marks in all blank fields on the same row that the “” mark has filled in.

(3) When at least one field in a column of wiring location is filled with the “” mark, then the wiring for that location is normal. Write “” marks in all blank fields on the same column that the “” mark has filled in under the circled number.

(4) Check the open circuit of the modules which have no “” mark in their columns of the wiring location in ascending order. (only for installed modules)

(5) If the communication is not possible after checking all harnesses, check the module power supply line.

(6) Replace the module if the power supply line is normal.

NOTE:

• Example of writing Subaru Select Monitor > COMMUNICATION FOR INITIALIZING IMPOSSIBLE

• Inspection using the communication for initializing of Subaru Select Monitor cannot be used to diagnose the wiring location marked with “-”. Example of DTC data not received List of Diagnostic Trouble Code (DTC) > LIST should be used to identify the faulty portion.

3. Subaru Select Monitor communication initialization check (impossible to communicate with all modules)

NOTE:

If at least one module becomes possible to communicate, return to 2).

(1) Check for the short circuit to ground. CAN Communication Circuit Check > INSPECTION If it is normal, go to the next.

(2) Check for the short circuit to battery. CAN Communication Circuit Check > INSPECTION If it is normal, go to the next.

(3) Perform the inspection for the resistance of 52 - or less (short between wires). CAN Communication Circuit Check > INSPECTION If it is normal, go to the next.

(4) Check for the open circuit of network diagram No. 12 (data link connector).

2. EXAMPLE OF WRITING FOR THE CHECK SHEET OF COMMUNICATION FOR INITIALIZING

• When No. 1 is open

• When No. 2 is open

• When No. 3 is open

• When No. 4 is open

• When No. 5 is open

• When No. 6 is open

• When No. 7 is open

• When No. 8 is open

• When No. 9 is open

• When No. 10 is open

• When No. 11 is open

• When No. 12 is open

NOTE:

Perform inspection by referring to 3) communication initialization check (impossible to communicate with all modules). (There may be a malfunction other than open circuit)

• When No. 13 is open

• When No. 14 is open

• When No. 15 is open

• When No. 16 is open

• When No. 17 is open

• When No. 18 is open

NOTE:

This is the same as No. 21, No. 24 and No. 26, but it is possible to diagnose using examples of lost communication detection in each module. List of Diagnostic Trouble Code (DTC) > LIST

• When No. 19 is open

• When No. 20 is open

• When No. 21 is open

NOTE:

This is the same as No. 18, No. 24 and No. 26, but the remote engine starter does not operate while no DTC is detected.

• When No. 22 is open

• When No. 23 is open

• When No. 24 is open

NOTE:

This is the same as No. 18, No. 21 and No. 26, but it is possible to diagnose using examples of lost communication detection in each module. List of Diagnostic Trouble Code (DTC) > LIST

• When No. 25 is open

• When No. 26 is open

NOTE:

This is the same as No. 18, No. 21 and No. 24, but the impact sensor does not operate while no DTC is detected.

Subaru select monitor

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Operation

For details of basic operations, refer to “Application help”. ...

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Inspection
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