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.

Tip:
  • When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) battery terminal, the power source mode changes to on (IG).

  • When the battery cable is disconnected and reconnected, the power source returns to the mode it was in before the battery cable was disconnected.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B2277

Detecting Vehicle Submersion

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

  • *: Only output while a malfunction is present and the engine switch is on (IG)

DTC No.

DTC Output Confirmation Operation

B2277

Wait 300 seconds after connecting the battery cable.

Table 1. Vehicle Condition and Fail-safe Function when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Function when Malfunction Detected

The engine cannot be turned off and the engine cannot be started.

The power source mode changes to on (IG) and starter relay activation is prohibited.

CAUTION / NOTICE / HINT

Note:
  • When using the intelligent tester 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 intelligent tester and vehicle begins, or 2) connect the intelligent tester to the vehicle and select "MANUAL" from the initial screen on the intelligent tester, and then select "KEY REGIST" under Model Code.

  • The entry and start system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting (Click here).

  • 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.

PROCEDURE

  1. CHECK FOR WATER DAMAGE

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

      Result

      Result

      Proceed to

      No signs of water damage

      A

      Signs of water damage

      B

    A

    REPLACE POWER MANAGEMENT CONTROL ECU

    B

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