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DTC 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.

HINT:

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 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 battery cable.

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

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.