DTC B2277: Detecting Vehicle Submersion: Procedure

CHECK FOR DTC
1. Clear the DTC. Refer to DTC CHECK / CLEAR .
2. Turn the engine switch on (IG).
3. After 330 seconds have elapsed, check if the trouble occurs again.
  OK
  
  DTC B2277 is not output.
NG → REPLACE POWER SOURCE CONTROL ECU

OK → See step 2
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING