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 [09/2022 - ]: 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 ignition switch was ON, whether the engine has started How did it happen? Problem symptoms Result
Proceed to NEXT Result:
NEXT
See step 3
- READ AND SAVE VEHICLE CONTROL HISTORY* NOTE:
- If the vehicle or vehicle controls are operated (for example, during initial inspection when the vehicle is brought in for repair) before vehicle control history has been read out and saved, the vehicle control history information could be lost.
- The function "Read vehicle control history" uses the current system time setting inside the GTS and the time counter inside the controlling ECU to calculate the timings shown in the vehicle control history. For this reason, before reading out the vehicle control history, first make sure that the GTS system clock is accurately set to the current time.
- Read and save vehicle control history using the GTS.
Refer to CHECK FOR INTERMITTENT PROBLEMS [09/2022 - ]
Body Electrical > Main Body > Utility
Tester Display Vehicle Control History (RoB) Result
Proceed to NEXT
Result:
NEXT
See step 4
- INSPECT AUXILIARY BATTERY
- Measure the auxiliary battery voltage with the ignition switch off.
Standard Voltage
11 to 14 V
If the voltage is below 11 V, recharge or replace the auxiliary 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, and deformation.
Result
Proceed to NEXT
Result:
NEXT
See step 5
- Measure the auxiliary battery voltage with the ignition switch off.
- CHECK CAN COMMUNICATION SYSTEM*
- Using the GTS, check for CAN communication system DTCs.
Refer to DIAGNOSIS SYSTEM [09/2022 - ]
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 [09/2022 - 09/2024] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2024 - ]
Result:
A
See step 6
- Using the GTS, check for CAN communication system DTCs.
- CHECK LIN COMMUNICATION SYSTEM*
- Using the GTS, check for LIN communication system DTCs.
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 [09/2022 - ]
Result:
A
See step 7
- Using the GTS, check for LIN communication system DTCs.
- CHECK POWER WINDOW CONTROL SYSTEM*
- Clear the DTCs.
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 DIAGNOSTIC TROUBLE CODE CHART [09/2022 - ]
Result:
A
See step 8
- Clear the DTCs.
- CHECK FOR DTC*
- Clear the DTCs.
Body Electrical > Main Body > Clear DTCs
- Recheck for DTCs.
Body Electrical > Main Body > Trouble Codes
Result
Result Proceed to DTC B1243-00 is not output A DTC B1243-00 is output B
Result:
B
GO TO DIAGNOSTIC TROUBLE CODE CHART
Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2022 - ]
Result:
A
See step 9
- Clear the DTCs.
- PROBLEM SYMPTOMS TABLE
- Refer to Problem Symptoms Table.
Refer to PROBLEM SYMPTOMS TABLE [09/2022 - ]
Result
Result Proceed to Fault is not listed in Problem Symptoms Table (Fault can be simulated) A Fault is not listed in Problem Symptoms Table (Fault cannot be simulated) B Fault is listed in Problem Symptoms Table C
Result:
B
CHECK FOR INTERMITTENT PROBLEMS
Refer to CHECK FOR INTERMITTENT PROBLEMS [09/2022 - ]
Result:
C
ADJUST, REPAIR OR REPLACE IN ACCORDANCE WITH PROBLEM SYMPTOMS TABLE
Result:
A
See step 10
- Refer to Problem Symptoms Table.
- OVERALL ANALYSIS AND TROUBLESHOOTING*
- Terminals of ECU
Refer to TERMINALS OF ECU [09/2022 - ]
- Data List / Active Test
Refer to DATA LIST / ACTIVE TEST [09/2022 - ]
- Operation Check
Refer to OPERATION CHECK [09/2022 - ]
- Inspection
Result
Proceed to NEXT
Result:
NEXT
See step 11
- Terminals of ECU
- REPAIR OR REPLACE
Result
Proceed to NEXT Result:
NEXT
See step 12
- 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.