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 certification ECU (smart key ECU assembly) is detected.

Tip:

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 No.

Detection Item

DTC Detection Condition

Trouble Area

DTC Output from

B2277

Detecting Vehicle Submersion

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.

*: Only detected while a malfunction is present.

Table 1. 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.

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Table 2. Related Data List and Active Test Items

DTC

Data List Item

Active Test Item

B2277

-

-

CAUTION / NOTICE / HINT

Note:

  • When using the GTS with the engine 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 hereClick here). Troubleshoot the entry and start 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 entry and start system (for Start Function) precaution.

    Click hereClick here

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

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.

PROCEDURE

  1. CHECK WATER DAMAGE

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

      Result

      Proceed to

      No signs of water damage

      Signs of water damage
    No signs of water damage

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    Signs of water damage

    TAKE MEASURES AGAINST CAUSE OF WATER DAMAGE AND REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)