Diagnostics Procedure Addition: DTC B2256 (CP1) – 2020-2022 Subaru

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NHTSA ID Number: 10215424

Manufacturer Communication Number: 18-224-22

Summary

This Service Information Bulletin is to inform you of the diagnosis procedure of the Harman Infotainment System when DTC B2256 is detected.

 


NUMBER: 18-224-22
DATE:  06/27/22

INTRODUCTION:

This Service Information Bulletin is to inform you of the diagnosis procedure of the Harman Infotainment System when DTC B2256 is detected. This update prevents unnecessary replacement of the Cockpit Control Module.

 

SERVICE PROCEDURE / INFORMATION:

DTC B2256 indicates a communication problem between the DCM and the Cockpit Control Module. The trouble tree below should be followed to prevent misdiagnosis of B2256.

NOTE: No diagnosis of B2256 should occur before a FULL SYSTEM SCAN has been completed and the Telematics system is confirmed to be DTC free. The presence of any Telematics DTCs would predicate diagnosing and repairing the Telematics fault before continuing the B2256 diagnosis. Failure to ensure the Telematics system is trouble-free will result in misdiagnosis and unnecessary parts replacement.

 

1. CHECK DTC.

1.Using the Subaru Select Monitor, perform the clear memory of [Cockpit Control]. Ref. to COMMON (DIAGNOSTICS)>Clear memory

2.Turn the ignition switch OFF → ON.

3. Read the DTC of [Cockpit Control] using the Subaru Select Monitor. Ref to COCKPIT CONTROL (DIAGNOSTICS) >Diagnostic Trouble Code (DTC)

Is DTC B2256 displayed? (Current code)

YES: Go to Step 2: Check Connector and Cable Connection (Open Circuit)

NO: 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.

 

2. CHECK CONNECTION AND CABLE (OPEN CIRCUIT).

1. Turn the ignition switch to OFF.

2. Disconnect the battery.

3. Disconnect the Cockpit Control Module connector.

4. Disconnect the DCM connector.

NOTE: A thorough inspection of the connectors and connector pins should be performed at this time. This is critical to aid in proper diagnosis and prevent incorrect part replacement. Previous repair history should be reviewed.

5. Using a DVOM, measure the resistance between the Cockpit Control Module connector and DCM connector.

Connector & terminal

(AD1) No. C1 — (AD18) No. F2:

(AD1) No. C2 — (AD18) No. F3:

(AD1) No. C3 — (AD18) No. F1:

(AD1) No. C4 — (AD18) No. F4:

(AD1) Shield connector — (AD18) Shield connector:

Is the resistance 1 Ω or less?

YES: Go to Step 3: Check Connection and Cable (Short to Ground) NO: Repair or replace the open circuit of harness.

 

3. CHECK CONNECTION AND CABLE (SHORT TO GROUND).

1. Using a DVOM, measure the resistance between the Cockpit Control Module connector and chassis ground.

Connector & terminal

(AD1) No. C1 — Chassis Ground:

(AD1) No. C2 — Chassis Ground:

(AD1) No. C3 — Chassis Ground:

(AD1) No. C4 — Chassis Ground:

(AD1) Shield connector — Chassis Ground:

Is the resistance 1 MΩ or more?

YES: Go to Step 4: Check Connection and Cable (Short to Power)

NO: Repair or replace the open circuit of harness.

 

4. CHECK HARNESS (SHORT TO POWER).

1. Turn the ignition switch to ON.

2. Using a DVOM, measure the voltage between Cockpit Control Module connector and chassis ground.

Connector & terminal

(AD1) No. C1 (+) — Chassis Ground (-):

(AD1) No. C2 (+) — Chassis Ground (-):

(AD1) No. C3 (+) — Chassis Ground (-):

(AD1) No. C4 (+) — Chassis Ground (-):

(AD1) Shield connector (+) — Chassis Ground (-):

Is the voltage less than 1 V?

YES: Go to Step 5: Check DCM

NO: Repair or replace the open circuit of harness.

 

5. CHECK DCM

1. Connect the DCM connector.

2. Connect the Cockpit Control Module connector.

3. Connect the battery.

NOTE: Failure to perform the proceeding order of operations for reconnecting the appropriate connectors & battery, could result in certain features not operating as designed.

4. Perform the inspection according to the diagnosis for the telematics system. to TELEMATICS SYSTEM (DIAGNOSTIC) > Basic Diagnostic Procedure.

Is the Telematics System Check, OK?

YES: Replace the Cockpit Control Unit. Ref. to ENTERTAINMENT & MONITORING > COCKPIT DISPLAY

NO: Replace the DCM. Ref. to ENTERTAINMENT AND MONITORING > DATA  COMMUNICATION MODULE.

 

APPENDIX INFORMATION

USB CONNECTION DETAIL

 

COMMON DIAGNSOTIC > Clear memory

Operation

1. On [Start] screen, select [Diagnosis].

2. On [Vehicle selection] screen, input the target vehicle information and select [OK].

3. On [Main Menu] screen, select [Each System].

4. On [Select System] screen, select the corresponding system and select [Enter].

5. On [Select Function] screen, select [DTC].

6. On [DTC] screen, select [Clear memory].

  • For detailed operation procedures, refer to “Help” of application.
  • When using the Subaru Select Monitor, turn the ignition switch to ON.
  • Sub screen may appear in the system selection display. In that case, select appropriate items in accordance with the contents of the display.
  • When the clear memory is performed, diagnostic code (DTC) and freeze frame data (FFD) necessary in diagnosis will also be deleted.
  • Before performing the clear memory, be sure to save the diagnostic code (DTC) and freeze frame data (FFD) stored in the module.
  • Initial diagnosis of electronic throttle control is performed after memory clearance. Wait for 10 seconds or more after turning the ignition switch to ON, and then start the

 

COMMON DIAGNOSTIC > Diagnostic Trouble Code (DTC)

Operation

1. On [Start] screen, select [Diagnosis].

2. On [Vehicle selection] screen, input the target vehicle information and select [OK].

3. On [Main Menu] screen, select [Each System].

4. On [Select System] screen, select the corresponding system and select [Enter].

5. On [Select Function] screen, select [DTC].

  • For detailed operation procedures, refer to “Help” of application.
  • When using the Subaru Select Monitor, turn the ignition switch to ON.
  • Sub screen may appear in the system selection display. In that case, select appropriate items in accordance with the contents of the display.
  • Current code is a diagnostic code displayed when the system is judging the current code. However, if a DTC is recorded due to poor contact etc., the code remains displayed as current code during the drive cycle even after the poor contact has resolved.
  • History code is a diagnostic code recorded when the current code is not detected but the system has detected a malfunction in the past. When the current code is recorded, it is also recorded to the history code at the same time.

 

TELEMATICS SYSTEM (DIAGNOSTICS) > General Description

1. BASIC INSPECTION

Before performing the diagnosis, check the following items which may affect the problems relating to the telematics system.

1. Check the 12V under the hood battery.

2. Check the relay and fuse condition.

3. Check the DCM harness and connectors are installed and firmly seated.

4. Verify DCM ground from terminal A14 to chassis ground.

 

TELEMATICS SYSTEM (DIAGNOSTICS) > Diagnostic Procedure for Subaru Select Monitor Communication. When communication with DCM is impossible

Detecting condition:

Defective harness connector

Power supply circuit malfunction

Defective DCM

Defective CAN communication circuit

Defective Subaru Select Monitor

 

Trouble symptom:

Communication is impossible between DCM and Subaru Select Monitor.

Please refer to the appropriate STIS manual of the same name for more detailed diagnostic information.

 

ENTERTAINMENT & MONITORING > AUDIO

1. Disconnect the ground terminal from the battery sensor, and wait for at least 60 seconds before starting work.

NOTE:

Release the shift lock and shift the select lever to the “N” position

2. Remove the cover LWR driver.

3. Remove the visor assembly.

4. Remove the driver monitoring unit assembly.

NOTE:

For the model without driver monitoring system, remove the cover center UPR in the same procedure as for the driver monitoring unit assembly.

5. Remove the grip and boot.

6. Remove the cover assembly front.

7. Release the clips, and remove the ornament panel mid passenger.

NOTE:

For models with keyless access with push button start, disconnect the push button ignition switch connector.

8. Remove the center information display assembly.

(1) Remove the bolt and release the clip.

(2) Disconnect the connectors, and then remove the center information display assembly.

9. Remove the backup unit assembly.

10. Remove the data communication module.

 

ENTERTAINMENT & MONTORING > DATA COMMUNICATION MODULE

 DATA COMMUNICATION MODULE

1. Disconnect the ground terminal from battery sensor.

 For the hybrid model, disconnect the battery negative terminal.

2. Remove the grille assembly – CTR ventilation.

3. Remove the audio assembly or navigation assembly.

4. Remove the data communication module.

(1) Disconnect the cable connected to the audio assembly.

(2) Remove the screws and remove the data communication module.

Do not drop or apply any impact to the data communication module.

Remove the screws on LH side in the same procedure as on the RH side.

 

LED illumination status list

 

Telematics Questionnaire

 

Telematics System (Diagnostics) > Basic Diagnostic Procedure.

 

 

1. Perform Customer Interview

2. Ask the customer when and how the trouble occurred using the interview check list. Ref. to TELEMATICS SYSTEM (DIAGNOSTICS) > Check List for Interview

Did you interview the customer?

YES: Go to Step 2: Perform Basic Inspection

NO: Perform the Interview and proceed to step 2.

 

2. Perform Basic Inspection

1. Perform Telematics Basic Inspection. Ref. to TELEMATICS SYSTEM (DIAGNOSTICS) > GENERAL DESCRIPTION > INSPECTION

Are the basic inspection results as expected?

YES: Go to Step 3 Check SSM4 Communication.

NO: Repair or Replace any faulty items found in the Telematics System Basic  Inspection, then proceed to step 3.

 

3. CHECK Subaru Select Monitor Communication.

1. Turn the ignition switch to ON.

2. Connect the Subaru Select Monitor.

3. Turn the ignition switch to ON and configure the SSM4 for the vehicle.

4. Select Telematics

Is Communication with the DCM possible?

YES: Go to Step 4: Check DTC

NO: Check the communication circuit. Ref. to TELEMATICS SYSTEM (DIAGNOSTICS) > Diagnostic Procedure for Subaru Select Monitor Communication.

 

4. CHECK DTC.

1. Read the Telematics DTC using the Subaru Select Monitor. Ref. to TELEMATICS  SYSTEM (DIAGNOSTICS)>Diagnostic Trouble Code (DTC)

If DTC is detected, only RED LED will illuminate. For details, refer to LED illumination status list.

Are any DTCs? (CURRENT MALFUNCTION)

YES: Record the DTC, time stamp and freeze frame data, then proceed to step 5: Perform Diagnosis.

NO: Finish Telematics Diagnosis. Test iButton and remote services operation before releasing to the customer.

 

5. Perform Diagnosis.

1. Perform the diagnosis for the displayed DTCs.

2. Repair or replace the cause of trouble.

3. Using the Subaru Select Monitor, perform the clear memory of [Telematics].

4. Read the DTC of [Telematics] using the Subaru Select Monitor.

Are any Telematics DTCs displayed? (Current malfunction)

YES: Go to Step 5: Perform Diagnosis. Repeat step 5 until no telematics DTCs are present.

NO: Finish Telematics Diagnosis. Test iButton and remote services operation  before releasing to the customer.

 


8 Affected Products

Vehicles

MAKE MODEL YEAR
SUBARU BRZ 2022
SUBARU LEGACY 2020-2022
SUBARU OUTBACK 2020-2022
SUBARU WRX 2022

 


1 Associated Document

Manufacturer Communications

NUMBER: 18-224-22
DATE: 06/27/22

https://www.nhtsa.gov/recalls?nhtsaId=10215424

MC-10215424-0001.pdf 2156.36KB

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  • Full OBD2 Diagnostics > Say goodbye to the hassle of manual check-ups via this srs code reader. Quickly correct Check Engine Light warning on most OBD2/CAN compatible vehicles. Easily access to your smog status with one simple click I/M Readiness; and being filled with features for live data readings, freeze frame data, plus EVAP system, onboard monitor test means this scan tool checks all daily car care boxes.
  • Work Easier > Red-Yellow-Green LEDs in this OBD2 scanner quickly show the overall DTC status without toggling through menu selections. HELP hotkey takes you directly to detailed descriptions/tips. Read/Erase DTC, I/M readiness shortcuts are added for optimized operation, along with DTC Lookup library for interpreting codes, designing the SRS OBD2 code reader a pleasure to use right out of the package even for beginners.
  • Helpful Service > Get instant, free lifetime access to the most recent updates to add new car models and troubleshooting bugs making the OBD2 scanner a long-term investment for any home mechanics. The extended 1 years of quality assurance sweetens the worry-free deal even further. Multilingual Menu: EN, FR, ES, DE, IT, RU, PT, and JP. NOTE: Only support upgrade on windows.
Bestseller No. 10
ANCEL FX2000 OBD2 Scanner Diagnostic Tool, ABS SRS Transmission Airbag Car Scanner, Check Engine Car Code Reader, Automotive Scan Tool for All Cars
  • 🔧【PLUG AND PLAY - EASY TO USE】 : ANCEL FX2000 car scanner only takes 3 steps to connect to the car for diagnosis without cumbersome operations. The latest FX2000 scan tool is equipped with a one-key diagnosis function, which can automatically identify the model and year of your car, and automatically diagnose the car. Even beginners can use it to read the data and find out what the fault codes mean.
  • 🚗【FULL OBD-LEVEL DIAGNOSTICS TOOL】: Quickly determines the cause of engine system faults, reads current, permanent and pending codes. After the repair, clears the codes and turns off the warning light. In addition, the FX2000 engine code reader also displays important OBD II advanced data such as fuel, live data and other manufacturer-specific parameters in real time to ensure that the engine ECU is operating correctly and safely, saving vehicle owners a lot of time and money in maintenance.
  • 🚙【TRANSMISSION FAULT DIAGNOSTIC TOOL】: Some noises come from the transmission? Ancel obd2 scanner will read fault codes, display live transmission system data (fluid temperature, fluid pump, clutch actuation, pressure, etc.), and ensures transmission performance is optimal for vehicle speed and load. It provides detailed TCMeBay data of the vehicle, so you can quickly and accurately find existing or potential problems.
  • 🚐【FIND OUT SRS WRONG】: ANCEL FX2000 automotive scanner is able to read and clear fault codes in the SRS (airbag) and turn off the warning light to make sure the system is working correctly and safely. This odb2 scanner also displays a live graphical data stream of the supplemental restraint system (air bag), which allows you to analyze and verify that the air bag system is working properly.
  • 🚌【ABS OBD2 SCANNER】:The FX2000 diagnostic scanner for all vehicles can read and clear the Diagnostic Trouble Codes (DTC) data stream transmitted from the ABS. By retrieving the ABS code data, the obd scanner can check the various brake components and accurately diagnose problems.

Last update on 2024-03-02 / Affiliate links / Images from Amazon Product Advertising API

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