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.
Occupant Classification System: Registration
- REGISTRATION
- If any DTCs related to the occupant classification ECU are output, troubleshoot those DTCs by referring to Diagnostic Trouble Code Chart.
- When ECU data saving or loading operations cannot be performed, replace the front seat cushion assembly (with occupant classification ECU and occupant classification sensor).
HINT:
- When the occupant classification ECU is replaced, the previous ECU data must be saved in the Techstream and loaded into the new ECU by following the procedure below.
- Until the data from the previous ECU are loaded into the new occupant classification ECU, these data are not cleared even when the Techstream is turned off.
- ECU EXCHANGE PROCEDURE (Before Exchange) describes the procedure to save the data in the Techstream from the occupant classification ECU installed on the vehicle. ECU EXCHANGE PROCEDURE (After Exchange) describes the procedure to load the data from the previous ECU, stored in the Techstream, into the new ECU.
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- Store the occupant classification ECU data in the Techstream by following the prompts on the Techstream screen.
HINT:
If the ECU data cannot be stored in the Techstream, replace the front seat cushion assembly (with occupant classification ECU and occupant classification sensor).
- Turn the ignition switch to ON.
- Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
- Replace the occupant classification ECU (See ON-VEHICLE INSPECTION ).
- Connect the cable to the negative (-) battery terminal.
- Turn the ignition switch to ON.
- Load the data from the previous ECU stored in the Techstream into the newly installed ECU by following the prompts on the Techstream screen.
- Turn the ignition switch off.
- Turn the ignition switch to ON.
- Clear the DTCs stored in the memory (See DTC CHECK / CLEAR ).
HINT:
If the DTCs are not cleared at this time, past DTCs will remain.
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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.