SMART KEY SYSTEM (for Start Function), Diagnostic DTC:B2277

DTC Code DTC Name
B2277 Detecting Vehicle Submersion

DESCRIPTION

This DTC is stored when a malfunction in the water submersion detection circuit in the certification ECU (smart key ECU assembly) is detected.

Tech Tips

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

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2277 The water submersion detection circuit in the certification ECU (smart key ECU assembly) detects water submersion (1-trip detection logic*).

  • Submersion of certification ECU (smart key ECU assembly) in water

  • Certification ECU (smart key ECU assembly)

 Wait 300 seconds after connecting the cable to the negative (-) battery terminal.

Vehicle Condition and Fail-safe Function when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Function when Malfunction Detected
The engine switch cannot be turned off and the engine cannot be started. -

INSPECTION PROCEDURE

Note


  • When using the Techstream with the engine switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins, or 2) connect the Techstream to the vehicle, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes.

  • The smart key system (for Start Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting Click here. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.

  • Before replacing the certification ECU (smart key ECU assembly), refer to the smart key system (for Start Function) precaution Click here.

  • After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

Tech Tips

Related Data List and Active Test Items
DTC Data List Item Active Test Item
B2277 - -

Tech Tips

Before proceeding with troubleshooting, check if there are any signs of water damage to the power management control ECU. If there are any signs of water damage, replace the power management control ECU and take measures against the cause of the water damage.

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Turn the engine switch on (IG).

    3. After 330 seconds have elapsed, check if the DTC has been output again.

      OK
      DTC B2277 is not output

      Tech Tips

      If there are any signs that water was present, before replacing the certification ECU (smart key ECU assembly), take measures to prevent any further water entry.


    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here