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

Subaru Legacy BN/BS (2015-2019) Service Manual / Telematics 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. INSPECTION MODE 1

DTC	Item	Note
U0073	CAN FAILURE, BUS ‘OFF’ DETECTION	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF
U0074	CONTROL MODULE COMMUNICATION BUS "BODY-CAN" OFF	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0074 CONTROL MODULE COMMUNICATION BUS "BODY-CAN" OFF
U0100	LOST COMMUNICATION WITH ECM/PCM "A"	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A"
U0101	LOST COMMUNICATION WITH TCM	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0101 LOST COMMUNICATION WITH TCM
U0122	LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0122 LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE
U0140	LOST COMMUNICATION WITH BODY CONTROL MODULE	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE
U0151	LOST COMMUNICATION WITH RESTRAINTS CONTROL MODULE	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0151 LOST COMMUNICATION WITH RESTRAINTS CONTROL MODULE
U0155	LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE
U0401	INVALID DATA RECEIVED FROM ECM/PCM "A"	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A"
U0402	INVALID DATA RECEIVED FROM TCM	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0402 INVALID DATA RECEIVED FROM TCM
U0416	INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0416 INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE
U0452	INVALID DATA RECEIVED FROM RESTRAINTS CONTROL MODULE	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U0452 INVALID DATA RECEIVED FROM RESTRAINTS CONTROL MODULE
U1235	LOST COMMUNICATION WITH EyeSight	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC U1235 LOST COMMUNICATION WITH EyeSight
B2A00	VIN READING	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A00 VIN READING
B2A01	LTE1 ANTENNA CIRCUIT	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A01 LTE1 ANTENNA CIRCUIT
B2A02	LTE2 ANTENNA CIRCUIT	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A02 LTE2 ANTENNA CIRCUIT
B2A03	GPS ANTENNA CIRCUIT	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A03 GPS ANTENNA CIRCUIT
B2A07	BACKUP BATTERY CHARGE SYSTEM PERFORMANCE	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A07 BACKUP BATTERY CHARGE SYSTEM PERFORMANCE
B2A08	SOS BUTTON CIRCUIT	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A08 SOS BUTTON CIRCUIT
B2A09	I-CALL BUTTON CIRCUIT	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A09 I-CALL BUTTON CIRCUIT
B2A0C	DCM INTERNAL FAULT	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A0C DCM INTERNAL FAULT
B2A0D	AIRBAG SIGNAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A0D AIRBAG SIGNAL
B2A0E	MUTE LINE CIRCUIT	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A0E MUTE LINE CIRCUIT
B2A0F	BACKUP BATTERY DEGRADATION	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A0F BACKUP BATTERY DEGRADATION
B2A10	BATTERY VOLTAGE HIGH	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A10 BATTERY VOLTAGE HIGH

Inspection steps:

1. Perform the Clear Memory Mode. Clear Memory Mode

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

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 1).

3. Turn the ignition switch to OFF.

4. Turn the ignition switch to ON, and wait for 5 seconds or more.

5. Read the DTC and check that the DTC is not displayed.

NOTE:

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

2. INSPECTION MODE 2

DTC	Item	Note
B2A04	MIC CIRCUIT	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A04 MIC CIRCUIT
B2A05	LEFT SPEAKER/AUDIO CIRCUIT	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A05 LEFT SPEAKER/AUDIO CIRCUIT
B2A06	RIGHT SPEAKER/AUDIO CIRCUIT	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A06 RIGHT SPEAKER/AUDIO CIRCUIT
B2A0A	RED LED CIRCUIT	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A0A RED LED CIRCUIT
B2A0B	GREEN LED CIRCUIT	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2A0B GREEN LED CIRCUIT

Inspection steps:

1. Perform the Clear Memory Mode. Clear Memory Mode

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

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 1).

3. Turn the ignition switch to OFF.

4. Close all doors. (The vehicle enters CAN sleep state.)

5. Wait for approx. 1 minute. After the indicator goes off, wait for another 1 minute. (DCM standby mode)

6. Turn the ignition switch to ON, and wait for 5 seconds or more.

7. Read the DTC and check that the DTC is not displayed.

NOTE:

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

Electrical component location location

(1)Data link connector(3)Telematics sub antenna(5)Audio or navigation(2)GPS antenna(4)Data communication module (DCM)(6)Instrument panel speaker (standard and H/K specifications)(1)Telematics antenna( ...

Control module i o signal

...

Other materials:

Inspection
1. Check that the starter relay does not have deformation, cracks and any other damage.2. Measure the resistance between starter relay terminals.Terminal No.Standard1 and 21 M- or more3 and 4128.07 — 156.53 - (when 20°C (68°F))3. Connect battery positive terminal to terminal No. 3 an ...