Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
How To Proceed With Troubleshooting [09/2014 - ]: Procedure
- VEHICLE BROUGHT TO WORKSHOP
Result
Proceed to NEXT Result:
NEXT
See step 2
- CUSTOMER PROBLEM ANALYSIS CHECK
HINT:
- In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
- Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
- The following 5 items are important points for problem analysis:
What Vehicle model, system name When Date, time, occurrence frequency, whether the problem occurred recently or has been occurring for a long time Where Whether the problem occurs at a specific location Under what conditions? Whether the doors were locked or unlocked, whether the engine switch was on (IG), whether the engine has started How did it happen? Problem symptoms Result
Proceed to NEXT Result:
NEXT
See step 3
- PRE-CHECK
- Measure the battery voltage.
Standard Voltage
11 to 14 V
If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.
- Check the fuses and relays.
- Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.
Result
Proceed to NEXT
Result:
NEXT
See step 4
- Measure the battery voltage.
- CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*
- Using the Techstream, check for CAN communication system DTCs.
Refer to DIAGNOSIS SYSTEM [09/2014 - 10/2015] , or refer to DIAGNOSIS SYSTEM [10/2015 - 08/2016] , or refer to DIAGNOSIS SYSTEM [08/2016 - 11/2017] , or refer to DIAGNOSIS SYSTEM [11/2017 - 10/2018] , or refer to DIAGNOSIS SYSTEM [10/2018 - 11/2019] , or refer to DIAGNOSIS SYSTEM [11/2019 - 09/2020] , or refer to DIAGNOSIS SYSTEM [09/2020 - 10/2022] , or refer to DIAGNOSIS SYSTEM [10/2022 - 10/2023] , or refer to DIAGNOSIS SYSTEM [10/2023 - ]
Result
Result Proceed to CAN DTCs are not output A CAN DTCs are output B
Result:
B
GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 11/2017] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 10/2018] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - ]
Result:
A
See step 5
- Using the Techstream, check for CAN communication system DTCs.
- CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*
- Using the Techstream, check for LIN communication system DTCs.
Refer to DTC CHECK / CLEAR [09/2014 - ]
Result
Result Proceed to LIN DTCs are not output A LIN DTCs are output B
Result:
B
GO TO LIN COMMUNICATION SYSTEM. Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2014 - 10/2022] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2022 - ]
Result:
A
See step 6
- Using the Techstream, check for LIN communication system DTCs.
- CHECK FOR DTC (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY)*
- Clear the DTCs.
Refer to DTC CHECK / CLEAR [09/2014 - ]
Body Electrical > Master Switch > Clear DTCs
- Recheck for DTCs.
Body Electrical > Master Switch > Trouble Codes
Result
Result Proceed to DTC B2312 is not output A DTC B2312 is output B
Result:
B
GO TO POWER WINDOW CONTROL SYSTEM. Refer to DTC B2312: Power Window Switch Malfunction [09/2014 - ]
Result:
A
See step 7
- Clear the DTCs.
- CHECK FOR DTC (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))*
- Clear the DTCs.
Refer to DTC CHECK / CLEAR [09/2014 - ]
Body Electrical > Main Body > Clear DTCs
- Recheck for DTCs.
Body Electrical > Main Body > Trouble Codes
Result
Result Proceed to DTC B1243 is not output A DTC B1243 is output B
Result:
B
GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2014 - ]
Result:
A
See step 8
- Clear the DTCs.
- PROBLEM SYMPTOMS TABLE
- Refer to Problem Symptoms Table.
Refer to PROBLEM SYMPTOMS TABLE [09/2014 - ]
Result
Result Proceed to Fault is not listed in Problem Symptoms Table A Fault is listed in Problem Symptoms Table B
Result:
B
See step 10
Result:
A
See step 9
- Refer to Problem Symptoms Table.
- OVERALL ANALYSIS AND TROUBLESHOOTING*
- Terminals of ECU
Refer to TERMINALS OF ECU [09/2014 - ]
- Data List / Active Test
Refer to DATA LIST / ACTIVE TEST [09/2014 - ]
- Operation Check
Refer to OPERATION CHECK [09/2014 - ]
- Inspection
Result
Proceed to NEXT
Result:
NEXT
See step 10
- Terminals of ECU
- REPAIR OR REPLACE
Result
Proceed to NEXT Result:
NEXT
See step 11
- CONFIRMATION TEST
Result
Proceed to NEXT Result:
NEXT
END
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.