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Driver seat heating · B18F513
The driver’s seat heating isn’t working. I have fault code B18F513. Where should I start?
E
B18F513 means “Driver seat NTC open circuit”. The diagnostic reference lists an inoperative driver-seat heating function as the symptom.
The possible causes are the harness or connectors, the driver-seat assembly, and the left domain controller. The code alone doesn’t tell us which one has failed.
Diagnostic reference · SEALION 7
B18F513 · Driver seat NTC open circuit
Fault condition: the measured NTC thermistor resistance is infinite.
What does the manual ask me to check first?
E
The first step is to confirm whether the fault returns. The manual starts with reading and clearing the left body domain controller’s fault codes, cycling the start switch as specified, and reading the codes again.
If the same code does not return, it directs you to the intermittent-fault check. If it does return, the next step is to check the controller software version.
For this example, the code returns and the software check is normal. What comes next?
E
The next two checks concern the seat and controller harness connectors. The manual asks you to look for corrosion, damage and backed-out terminals, following the disconnection conditions in each step.
A connector or harness fault takes the repair-or-replace-harness branch. If those checks are normal, the sequence continues to the NTC+ and ground circuits.
Show me the reference for those two circuit checks.
E
The reference identifies these two paths. Both have a specified resistance of less than 1 Ω. Use the full procedure and its preceding conditions when carrying out the checks.
NTC+ and ground circuit continuity
| Circuit | Terminals | Reference |
|---|---|---|
| NTC+ | KG64(J)-13 → K01-42 | < 1 Ω |
| Ground | KG64(I)-5 → K01-31 | < 1 Ω |
BYD SEALION 7 / Repair manual
Front seats · Component location
The illustration identifies the driver and front passenger seat assemblies.
BYD SEALION 7 / Repair manual
Driver seat · Removal and installation
Illustrations from the driver-seat removal and installation reference.
BYD SEALION 7 / Repair manual
Seat trim and adjustment switch
Selected illustrations from the driver-seat trim and adjustment-switch reference.
BYD SEALION 7 / Wiring diagrams
Driver seat system
Driver-seat system circuit diagram. Scroll through the drawing or open it at full size.
BYD SEALION 7 / Wiring diagrams
Front passenger seat system
Front-passenger seat system circuit diagram.
BYD SEALION 7 / Wiring diagrams
Rear seat system
Rear-seat circuit diagram.
EVCando supports multiple languages. This illustrative demo follows your selected language; its illustrations are redrawn for the demo and are not original manufacturer images. Conversations are edited examples based on selected manufacturer repair information, not live AI output or a complete repair procedure.
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