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SMART ENTRY AND START SYSTEM(for Start Function), Diagnostic DTC:B2277

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DTC Code DTC Name
B2277 Detecting Vehicle Submersion
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DESCRIPTION

This DTC is stored when a malfunction in the water submersion detection circuit in the power management control ECU is detected.

Tip:

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.

DTC Code DTC Detection Condition Trouble Area DTC Output Confirmation Operation
B2277 The water submersion detection circuit in the power management control ECU detects water submersion (1-trip detection logic*).

  • Submersion of power management control ECU in water

  • Power management control ECU

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

Table 1. Vehicle Condition and Fail-safe Function when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Function when Malfunction Detected
The power switch cannot be turned off and the hybrid control system cannot be started. -
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CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the vehicle power switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

  • The smart entry and start 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 entry and start system (for Start Function) after confirming that the communication systems are functioning properly.

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

Tip:
Table 2. Related Data List and Active Test Items
DTC Data List Item Active Test Item
B2277 - -
Tip:

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.

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PROCEDURE


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    CHECK FOR DTC


    1. Clear the DTCs (Click here).

    2. Turn the power switch on (IG).

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

      OK
      DTC B2277 is not output
      Tip:

      If there are any signs that water was present, before replacing the power management control ECU, take measures to prevent any further water entry.


    • OK

      END (USE SIMULATION METHOD TO CHECK) (Click here)

    • NG

      REPLACE POWER MANAGEMENT CONTROL ECU (Click here)