DTC B2277: Detecting Vehicle Submersion: Procedure

WARNING: This page is about a different car, the 2011 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

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 DTC has been set again.
  OK
  
  DTC B2277 is not output.
  
  HINT:
  
  If there are any signs that water was present, before replacing the power source control ECU, take measures to prevent any further water entry.
NG → See step 2

OK → See step 3
REPLACE POWER MANAGEMENT CONTROL ECU. Refer to REMOVAL
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING