DTC B2274: ACC Monitor Malfunction [08/2015 - 08/2019]: Description

This DTC is stored when a malfunction in the ACC output circuit between the ACC output terminal of the power management control ECU and the ACC relay 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
B2274	Malfunction in the ACC relay activation circuit in the power management control ECU or the external circuit (1-trip detection logic*). HINT: When the voltage at terminal ACCD is not at the standard, the system is determined to be malfunctioning.	AM2 fuse Driver side junction block assembly (ACC relay) Power management control ECU Harness or connector	Wait 10 seconds after turning the engine switch on (ACC) or on (IG), and then wait another 10 seconds after turning the engine switch off. HINT: To turn the engine switch on (ACC), carry the key and press the engine switch with the shift lever in P and the brake pedal released.

*: 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
If there is a malfunction when the relay is stuck on, the ACC relay does not turn off even though all the power is off. If there is a malfunction when the relay is off, the ACC relay does not turn on even though the power source mode is on (ACC). HINT: The power source can change to on (IG) and the engine can be started.	-