ENTRY AND START 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 power management control ECU is detected.

Tech Tips

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

  • Power management control ECU

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

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

INSPECTION PROCEDURE

Note


  • When using the GTS with the power switch off to troubleshoot:

    Connect the GTS to the DLC3 and turn a courtesy light switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.

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

  • Before replacing the power management control ECU, refer to the entry and start 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

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 WATER DAMAGE


    1. Check the power source control ECU, surrounding parts, wire harnesses and connectors for any signs of water damage.

      Result
      Result Proceed to
      No signs of water damage A
      Signs of water damage B

    B

    TAKE MEASURES AGAINST CAUSE OF WATER DAMAGE AND REPLACE POWER MANAGEMENT CONTROL ECU)

    A

    REPLACE POWER MANAGEMENT CONTROL ECU Click here