Subaru Legacy BN/BS (2015-2019) Service Manual: Inspection mode procedure

Subaru Legacy BN/BS (2015-2019) Service Manual / Keyless access with push button start system (diagnostics) / Inspection mode procedure

It is possible to diagnose the DTC by performing the indicated inspection mode. After correcting the DTC, perform a necessary inspection mode and make sure that the function is resumed correctly and the DTC is recorded.

1. PREPARATION FOR THE INSPECTION MODE

1. Check that the battery voltage is 12 V or more and fuel remains approx. half [20 — 40 L (5.3 — 10.6 US gal, 4.4 — 8.8 Imp gal)].

2. Perform the Clear Memory Mode. Clear Memory Mode

3. Read the DTC and check that the DTC is not displayed. Read Diagnostic Trouble Code (DTC)

NOTE:

If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis according to DTC. After solving the DTC, repeat from step 2).

2. INSPECTION MODE 1

DTC	Item	Note
U0073	CAN FAILURE, BUS ‘OFF’ DETECTION	—
U0100	LOST COMMUNICATION WITH ECM/PCM "A"	—
U0101	LOST COMMUNICATION WITH TCM	—
U0122	LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE	—
U0140	LOST COMMUNICATION WITH BODY CONTROL MODULE	—
U0155	LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE	—
U0401	INVALID DATA RECEIVED FROM ECM/PCM "A"	—
U0422	INVALID DATA RECEIVED FROM BODY CONTROL MODULE	—
B1571	REFERENCE CODE INCOMPATIBILITY (IMMOBILIZER CM TO ECM)	—
B1572	IMM CIRCUIT EXCEPT ANTENNA CIRCUIT	—
B1576	EGI CONTROL MODULE EEPROM	—
B1577	IMM CONTROL MODULE EEPROM	—
B2271	IGN RELAY CONTROL CIRCUIT	—
B2274	ACC RELAY CONTROL CIRCUIT	—
B2275	ENGINE START REQUEST CONTROL CIRCUIT	—
B2276	ACC RELAY OFF SIGNAL	—
B2277	SUBMERGING CIRCUIT	—
B2285	STEERING LOCK POSITION SIGNAL CORRELATION	—
B2286	ENGINE SPEED SIGNAL(WITHOUT Auto Start Stop)	—
B2781	STEERING LOCK CM CONTROL CIRCUIT	—
B2782	STEERING LOCK DRIVE REQUEST SIGNAL CORRELATION	—
B2785	LIN COMMUNICATION	—
B2786	STEERING LOCK CM COMMUNICATION	—
B2788	IGN SIGNAL CORRELATION (STEERING LOCK CM)	—
B2789	ID CODE BOX COMMUNICATION	—
B278D	ID CODE BOX JUDGMENT CIRCUIT	—
B2793	BACK UP POWER	—

Diagnostic procedure:

1. Prepare for the inspection mode. Inspection Mode > PROCEDURE

2. Start the engine, and let it idle for 40 seconds or more.

3. Read the DTC and check that the DTC is not displayed. Read Diagnostic Trouble Code (DTC)

NOTE:

If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis according to DTC.

3. INSPECTION MODE 2

DTC	Item	Note
B2779	REMOTE CONTROL ENGINE STARTER COLLATION	—

Diagnostic procedure:

1. Prepare for the inspection mode. Inspection Mode > PROCEDURE

2. Register the remote engine starter, and operate it.

3. Read the DTC and check that the DTC is not displayed. Read Diagnostic Trouble Code (DTC)

NOTE:

If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis according to DTC.

4. INSPECTION MODE 3

DTC	Item	Note
B2790	ID CODE BOX CIRCUIT	—
B27A1	DRIVER SIDE EXTERNAL ANTENNA OPEN	—
B27A2	PASSENGER SIDE EXTERNAL ANTENNA OPEN	—
B27A5	FRONT INTERNAL ANTENNA OPEN	—
B27A6	REAR INTERNAL ANTENNA OPEN	—
B27A7	TRUNK/REAR GATE INTERNAL ANTENNA OPEN	—
B27A8	TRUNK/REAR GATE EXTERNAL ANTENNA OPEN	—

Diagnostic procedure:

1. Prepare for the inspection mode. Inspection Mode > PROCEDURE

2. Read the DTC and check that the DTC is not displayed. Read Diagnostic Trouble Code (DTC)

NOTE:

If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis according to DTC.

5. INSPECTION MODE 4

DTC	Item	Note
B2282	VEHICLE SPEED SIGNAL CORRELATION	—
B2283	VEHICLE SPEED SENSOR	—

Diagnostic procedure:

1. Prepare for the inspection mode. Inspection Mode > PROCEDURE

2. Drive for 20 seconds or more at a vehicle speed of 25 km/h (15.5 MPH) or more.

3. Read the DTC and check that the DTC is not displayed. Read Diagnostic Trouble Code (DTC)

NOTE:

If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis according to DTC.

6. INSPECTION MODE 5

DTC	Item	Note
B2784	ANTENNA CIRCUIT (PUSH ENGINE SWITCH)	—
B278A	PUSH ENGINE SWITCH POWER SUPPLY CIRCUIT	—

Diagnostic procedure:

1. Prepare for the inspection mode. Inspection Mode > PROCEDURE

2. Press the push button ignition switch with no access key in the passenger room.

3. Read the DTC and check that the DTC is not displayed. Read Diagnostic Trouble Code (DTC)

NOTE:

If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis according to DTC.

7. INSPECTION MODE 6

DTC	Item	Note
B2284	BRAKE SIGNAL CORRELATION	—

Diagnostic procedure:

1. Prepare for the inspection mode. Inspection Mode > PROCEDURE

2. Turn the ignition switch to ON, depress and hold the brake pedal for 20 seconds of more, then release the brake pedal and wait for 20 seconds and more.

3. Read the DTC and check that the DTC is not displayed. Read Diagnostic Trouble Code (DTC)

NOTE:

If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis according to DTC.

General diagnostic table inspection

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