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HOMESERVICE MANUALSTOYOTA2018PRIUS TWO ECOREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEDOOR LOCKSSMART KEY SYSTEM (KEYLESS START) - DIAGNOSTIC CODES & SYMPTOM TESTSSMART KEY SYSTEM (FOR START FUNCTION)DTC B2274: ACC MONITOR MALFUNCTION [11/2015 - ]CAUTION / NOTICE / HINT
2018 Toyota Prius Two Eco

Caution / Notice / Hint

2018 Toyota Prius Two EcoSECTION Caution / Notice / Hint
NOTE:
  • When using the Techstream with the power switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
  • The smart key system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - ]

  • Inspect the fuses of circuits related to this system before performing the following procedure.
  • Before replacing the certification ECU (smart key ECU assembly), refer to the smart key system (for Start Function) Precaution.

    Refer to PRECAUTION [11/2015 - 12/2018] , or refer to PRECAUTION [12/2018 - 07/2020] , or refer to PRECAUTION [07/2020 - ]

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

HINT: 

When the cable is disconnected and reconnected to the negative (-) auxiliary battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

RENDER: 1.0x

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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.