Toyota 4Runner: Detecting Vehicle Submersion (B2277)

Toyota 4Runner Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System(for Start Function) / Detecting Vehicle Submersion (B2277)

DESCRIPTION

This DTC is stored when a malfunction in the submersion monitor circuit inside 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 is reset to on (IG). When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC Code	DTC Detection Condition	Trouble Area
B2277	A malfunction in the submersion monitor circuit inside the power management control ECU is detected.	Submerged power management control ECU Power management control ECU

CAUTION / NOTICE / HINT

NOTICE:

When using the Techstream with the engine switch off to troubleshoot: Connect the Techstream to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.
Before performing the inspection, check that there are no problems related to the CAN communication system and LIN communication system.
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	CHECK FOR TRACES OF WATER

(a) Check the power management control ECU, peripheral components and wire harnesses for traces of water.

Result

Result	Proceed to
There are traces of water	A
There are no traces of water	B

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

REPLACE POWER MANAGEMENT CONTROL ECU

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