DTC B2277 Detecting Vehicle Submersion

DESCRIPTION

This DTC is output when the submersion circuit monitor inside the power source control ECU detects that the vehicle is submerged in water.

When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC No.	DTC Detection Condition	Trouble Area
B2277	Submersion circuit monitor inside power source control ECU detects that vehicle is submerged in water	Power source control ECU

1.CHECK FOR WATER DAMAGE

Check the power source control ECU, peripheral components, and wire harnesses for traces of water.

NG

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

OK

2.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)

Disconnect the ECU connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance:
Tester Connection (Symbols) Condition Specified Condition
J55-6 (GND2) - Body ground Always Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE POWER SOURCE CONTROL ECU

LEXUS IS250, IS220d / GSE20 ALE20

Tester Connection (Symbols)	Condition	Specified Condition
J55-6 (GND2) - Body ground	Always	Below 1 Ω