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.
DTC B14F5: Overcurrent Detected in Seat Heater: Procedure
- CHECK FOR DTC
- Check for DTCs. Refer to DTC CHECK / CLEAR
.RESULT
Result Proceed to DTC is output (Driver seat climate control ECU) A DTC is output (Passenger seat climate control ECU) B DTC is output (Rear seat climate control ECU LH) C DTC is output (Rear seat climate control ECU RH) D
D → See step 11
C → See step 8
B → See step 5
A: Go to next step
- Check for DTCs. Refer to DTC CHECK / CLEAR
.
- CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - FRONT SEAT CUSHION COVER LH)
- Disconnect the e35 ECU connector.
- Disconnect the e42 cushion cover connector.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
Tester Connection Condition Specified Condition e35-1 (B) - e42-2 (B) Always Below 1 Ω e35-1 (B) - Body ground Always 10 kΩ or higher e35-5 (E) - e42-4 (E) Always Below 1 Ω e35-5 (E) - Body ground Always 10 kΩ or higher e35-1 (B) - e35-5 (E) Always 10 kΩ or higher
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- CHECK SEAT CLIMATE CONTROL ECU (OPERATION)
- Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.
OK
DTC is not output
NG → See step 14
OK → See step 4
- Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.
- REPLACE SEAT CLIMATE CONTROL ECU. Refer to DISASSEMBLY
- CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - FRONT SEAT CUSHION COVER RH)
- Disconnect the e3 ECU connector.
- Disconnect the e9 cushion cover connector.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
Tester Connection Condition Specified Condition e3-1 (B) - e9-2 (B) Always Below 1 Ω e3-1 (B) - Body ground Always 10 kΩ or higher e3-5 (E) - e9-4 (E) Always Below 1 Ω e3-5 (E) - Body ground Always 10 kΩ or higher e3-1 (B) - e3-5 (E) Always 10 kΩ or higher
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- CHECK SEAT CLIMATE CONTROL ECU (OPERATION)
- Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.
OK
DTC is not output
NG → See step 15
OK → See step 7
- Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.
- REPLACE SEAT CLIMATE CONTROL ECU. Refer to DISASSEMBLY
- CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK COVER LH)
- Disconnect the f27 ECU connector.
- Disconnect the f23 seatback cover connector.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
Tester Connection Condition Specified Condition f27-1 (B) - f23-1 (B) Always Below 1 Ω f27-1 (B) - Body ground Always 10 kΩ or higher f27-5 (E) - f23-3 (E) Always Below 1 Ω f27-5 (E) - Body ground Always 10 kΩ or higher f27-1 (B) - f27-5 (E) Always 10 kΩ or higher
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- CHECK SEAT CLIMATE CONTROL ECU (OPERATION)
- Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.
OK
DTC is not output
NG → See step 16
OK → See step 10
- Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.
- REPLACE SEAT CLIMATE CONTROL ECU. Refer to DISASSEMBLY
- CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL ECU - REAR SEATBACK COVER RH)
- Disconnect the f7 ECU connector.
- Disconnect the f3 seatback cover connector.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
Tester Connection Condition Specified Condition f7-1 (B) - f3-1 (B) Always Below 1 Ω f7-1 (B) - Body ground Always 10 kΩ or higher f7-5 (E) - f3-3 (E) Always Below 1 Ω f7-5 (E) - Body ground Always 10 kΩ or higher f7-1 (B) - f7-5 (E) Always 10 kΩ or higher
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step
- CHECK SEAT CLIMATE CONTROL ECU (OPERATION)
- Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.
OK
DTC is not output
RESULTResult Proceed to OK (w/o Ottoman) A OK (w/ Ottoman) B NG (w/o Ottoman) C NG (w/ Ottoman) D
D → See step 19
C → See step 17
B → See step 18
A → See step 13
- Replace the seat climate control ECU with a new one or normally operating one, and check if a DTC is output.
- REPLACE SEAT CLIMATE CONTROL ECU. Refer to DISASSEMBLY
- REPLACE FRONT SEAT CUSHION COVER LH. Refer to DISASSEMBLY
- REPLACE FRONT SEAT CUSHION COVER RH. Refer to DISASSEMBLY
- REPLACE REAR SEATBACK COVER LH. Refer to DISASSEMBLY
- REPLACE REAR SEATBACK COVER RH. Refer to DISASSEMBLY
- REPLACE SEAT CLIMATE CONTROL ECU. Refer to DISASSEMBLY
- REPLACE REAR SEATBACK COVER RH. Refer to DISASSEMBLY
NO RELATED
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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.