Toyota Yaris: Smart Key System (for Start Function) / Wireless Starter Component Internal Failure (B277A96)

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Start Function) / Wireless Starter Component Internal Failure (B277A96)

DESCRIPTION

If the remote engine start ECU does not respond to the certification ECU (smart key ECU assembly) or the remote engine start ID is not registered, this DTC is stored.

HINT:

Registration status of the remote engine start ECU ID can be checked using the "Wireless C Code" item in the Data List.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Note
B277A96	Wireless Starter Component Internal Failure	One of the following conditions is met (1 trip detection logic*): A remote start communication error occurs. Response is not possible. Registration has not been performed.	CAN communication system Remote engine start ECU Certification ECU (smart key ECU assembly)	A remote start operation is performed.

*: Only output while a malfunction is present.

Vehicle Condition and Fail-safe Operation when Malfunction Detected

Vehicle Condition when Malfunction Detected	Fail-safe Operation when Malfunction Detected
Engine does not start with remote start operation	Engine cannot be started by remote start operation only

Related Data List and Active Test

DTC No.	Data List and Active Test
B277A96	-

CAUTION / NOTICE / HINT

NOTICE:

When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
The smart key system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.
Click here
Before replacing the certification ECU (smart key ECU assembly), refer to Registration.
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After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

PROCEDURE

1.	CHECK CAN COMMUNICATION SYSTEM

(a) Check for CAN communication system DTCs.

Click here

OK:

CAN communication DTCs are not output.

GO TO CAN COMMUNICATION SYSTEM (DIAGNOSTIC TROUBLE CODE CHART)

2.	REGISTER REMOTE ENGINE STARTER ID

(a) Register the remote engine starter ID.

OK:

Registration can be completed.

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

3.	CHECK REMOTE ENGINE STARTER FUNCTION

(a) Check the remote engine starter function.

OK:

Remote engine starter functions operate normally.

END (REMOTE ENGINE STARTER ID WAS NOT REGISTERED)

REPLACE REMOTE ENGINE START ECU

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