Diagnostics Procedure Addition: DTC B2255 – 2019-2022 Subaru

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Bulletin Number: 18-225-22R; Revised: 09/06/22 Page 1 of 10 SERVICE BULLETIN Continued… CAUTION: VEHICLE SERVICING PERFORMED BY UNTRAINED PERSONS COULD RESULT IN SERIOUS INJURY TO THOSE PERSONS OR TO OTHERS. Subaru Service Bulletins are intended for use by professional technicians ONLY. They are written to inform those technicians of conditions that may occur in some vehicles, or to provide information that could assist in the proper servicing of the vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do the job correctly and safely. If a condition is described, DO NOT assume that this Service Bulletin applies to your vehicle, or that your vehicle will have that condition. Subaru of America, Inc. is ISO 14001 Compliant ISO 14001 is the international standard for excellence in Environmental Management Systems. Please recycle or dispose of automotive products in a manner that is friendly to our environment and in accordance with all local, state and federal laws and regulations. NUMBER: 18-225-22R DATE: 06/27/22 REVISED: 09/06/22 APPLICABILITY: 2019 – 22MY Crosstrek & Impreza 2019 – 22MY Forester 2019 – 22MY Ascent SUBJECT: Diagnostics Procedure Addition: DTC B2255 INTRODUCTION: This Service Bulletin is to inform you of the diagnosis procedure of the Harman Infotainment System when DTC B2255 is detected. This update prevents unnecessary replacement of the head unit or USB cable. SERVICE PROCEDURE / INFORMATION: DTC B2255 indicates a communication problem between the DCM and the Head Unit. The trouble tree below should be followed to prevent misdiagnosis of the head unit or the USB2 cable NOTE: No diagnosis of B2255 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 B2255 diagnosis. Failure to ensure the Telematics system is trouble-free will result in misdiagnosis and unnecessary part(s) replacement. 1. CHECK DTC. 1. Turn the ignition switch to ON. 2.Using the Subaru Select Monitor, perform the clear memory of [Infotainment]. Ref. to_COMMON (DIAGNOSTICS)>Clear memory. 3.Turn the ignition switch OFF → ON. 4. Read the DTC of [Infotainment] using the Subaru Select Monitor. Ref. to INFOTAINMENT(DIAGNOSTICS) >Diagnostic Trouble Code (DTC) Is DTC B2255 displayed? (Current code) YES: Go to Step 2: Check Harness (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. In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause. ATTENTION: GENERAL MANAGER q PARTS MANAGER q CLAIMS PERSONNEL q SERVICE MANAGER q IMPORTANT – All Service Personnel Should Read and Initial in the boxes provided, right. ©2022 Subaru of America, Inc. All rights reserved. Bulletin Number: 18-225-22R; Revised: 09/06/22 Page 2 of 10 Continued… 2. CHECK HARNESS (OPEN CIRCUIT). 1. Turn the ignition switch to OFF. 2. Disconnect the battery. 3. Disconnect the audio connector or navigation unit 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 audio connector or navigation unit connector and DCM connector. Connector & terminal (AD63) No. 1 — (AD59) No. 2: (AD63) No. 2 — (AD59) No. 3: (AD63) No. 3 — (AD59) No. 1: (AD63) No. 4 — (AD59) No. 4: (AD63) Shield connector — (AD59) Shield connector: Is the resistance 1 Ω or less? YES: Go to Step 3: Check Harness (Short to Ground) NO: Repair or replace the open circuit of harness. 3. CHECK HARNESS (SHORT TO GROUND). 1. Using a DVOM, measure the resistance between audio connector or navigation unit connector and chassis ground. Connector & terminal (AD63) No. 1 — Chassis Ground: (AD63) No. 2 — Chassis Ground: (AD63) No. 3 — Chassis Ground: (AD63) No. 4 — Chassis Ground: (AD63) Shield connector — Chassis Ground: Is the resistance 1 MΩ or more? YES: Go to Step 4: Check Harness (Short to Power) NO: Repair or replace the open circuit of harness. Bulletin Number: 18-225-22R; Revised: 09/06/22 Page 3 of 10 Continued… 4. CHECK HARNESS (SHORT TO POWER). 1. Turn the ignition switch to ON. 2. Using a DVOM, measure the voltage between audio connector or navigation unit connector and chassis ground. Connector & terminal (AD63) No. 1 (+) — Chassis Ground (-): (AD63) No. 2 (+) — Chassis Ground (-): (AD63) No. 3 (+) — Chassis Ground (-): (AD63) No. 4 (+) — Chassis Ground (-): (AD63) 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. 2. Connect the audio connector or navigation unit connector. 3. Connect the battery. NOTE: Failure to perform the proceeding order of operations for reconnecting the appropriate connectors & battery, could result in certain functions not operating as designed. 4.Perform the inspection according to the diagnosis for the telematics system. Ref. to TELEMATICS SYSTEM (DIAGNOSTIC) > Basic Diagnostic Procedure. Is the Telematics System Check, OK? YES: Replace the audio of navigation unit. Ref. to ENTERTAINMENT & MONITORING > AUDIO NO: Repair the DCM. Ref. to ENTERTAINMENT AND MONITORING > DATA COMMUNICATION MODULE. Bulletin Number: 18-225-22R; Revised: 09/06/22 Page 4 of 10 Continued… APPENDIX INFORMATION USB CONNECTION OVERVIEW COMMON DIAGNOSTIC > 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 engine. Bulletin Number: 18-225-22R; Revised: 09/06/22 Page 5 of 10 Continued… 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. Bulletin Number: 18-225-22R; Revised: 09/06/22 Page 6 of 10 Continued… 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. 2. Remove the grille ventilation assembly center. 3. Remove the switch assembly hazard or upper center panel 4. Remove the audio assembly. (1) Remove the screws. (2) Release the clips and disconnect the connector, and then remove the audio assembly. For models with telematics, the data communication module is attached on the upper side of the audio assembly. 5. Remove the backup unit. 6. Remove the data communication module. 7. Remove the audio bracket. (1) Remove the screws, and then remove the audio bracket. Remove the screws on LH side in the same procedure as on the RH side. Bulletin Number: 18-225-22R; Revised: 09/06/22 Page 7 of 10 Continued… 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 Bulletin Number: 18-225-22R; Revised: 09/06/22 Page 8 of 10 Continued… Telematics Questionnaire Bulletin Number: 18-225-22R; Revised: 09/06/22 Page 9 of 10 Continued… Telematics System (Diagnostics) > Basic Diagnostic Procedure. 1. Perform Customer Interview 1. 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. Connect the Subaru Select Monitor. 2. Turn the ignition switch to ON. 3. 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. Bulletin Number: 18-225-22R; Revised: 09/06/22 Page 10 of 10 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. IMPORTANT REMINDERS: • SOA strongly discourages the printing and/or local storage of service information as previously released information and electronic publications may be updated at any time. • Always check for any open recalls or campaigns anytime a vehicle is in for servicing. • Always refer to STIS for the latest service information before performing any repairs.

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