B2284

DTC Code	DTC Name
B2284	Brake Signal Malfunction

DESCRIPTION

The certification ECU (smart key ECU assembly) receives brake signal information from 2 sources. It receives a signal from the stop light switch assembly via a direct line, and a signal from the ECM via CAN. If the information from these 2 sources is inconsistent, this DTC will be stored.

Tech Tips

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 No.	DTC Detection Condition	Trouble Area	DTC Output Confirmation Operation
B2284	The brake signal information from the direct line and the brake signal information from the ECM via CAN communication are inconsistent (1-trip detection logic*).	AM2 fuse STOP fuse Certification ECU (smart key ECU assembly) SFI system (except 1ND-TV) ECD system (for 1ND-TV) Wire harness or connector	Connect the cable to the negative (-) battery terminal, turn the brakes off for 20 seconds or more and then turn them on for 20 seconds or more. Then depress the brake pedal for 20 seconds or more.

DTC No.

DTC Detection Condition

Trouble Area

DTC Output Confirmation Operation

B2284

The brake signal information from the direct line and the brake signal information from the ECM via CAN communication are inconsistent (1-trip detection logic*).

AM2 fuse
STOP fuse
Certification ECU (smart key ECU assembly)
SFI system (except 1ND-TV)
ECD system (for 1ND-TV)
Wire harness or connector

Connect the cable to the negative (-) battery terminal, turn the brakes off for 20 seconds or more and then turn them on for 20 seconds or more.

Then depress the brake pedal for 20 seconds or more.

*: 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
When the electrical key transmitter sub-assembly is inside the vehicle, the engine does not start even though an engine start operation is performed (the entry key indicator in the combination meter assembly does not illuminates in green). However, if the engine switch is pressed and held for a certain period of time after the power source mode is changed to on (ACC), the engine can be started. When a direct line ON malfunction is present, the engine can be started by pressing the engine switch even if the brakes are off. When a direct line OFF malfunction is present, the engine cannot be started by pressing the engine switch even if the brakes are on.	-

Related Data List and Active Test Items
DTC No.	Data List Item	Active Test Item
B2284	Power Source Control Stop Light Switch1 Powertrain / Engine and ECT ST1	-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Note

When using the intelligent tester with the engine switch off to troubleshoot:

Connect the intelligent tester to the DLC3 and turn a courtesy light switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.
The entry and start system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting Click here.
Before replacing the certification ECU (smart key ECU assembly), refer to the entry and start system (for Entry Function) Click here.
After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.
Inspect the fuses of circuits related to this system before performing the following inspection procedure.

PROCEDURE

READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH ASSEMBLY)

Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG).
Turn the intelligent tester on.
Enter the following menus: Body / Power Source Control / Data List.

According to the display on the intelligent tester, read the Data List.

Power Source Control
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Stop Light Switch1	State of brake pedal / OFF or ON	OFF: Brake pedal released ON: Brake pedal depressed	Use this item to determine whether the stop light switch is malfunctioning. The engine cannot be started when this item is "OFF". When this item is malfunctioning, the engine can be started by pressing and holding the engine switch for a certain period of time.

OK
ON (brake pedal depressed) and OFF (brake pedal released) appear on the screen.

Result
Result	Proceed to
NG	A
OK (for 1KR-FE)	B
OK (for 1NR-FE)	C
OK (for 1ND-TV with DPF)	D
OK (for 1ND-TV without DPF)	E

B

GO TO SFI SYSTEM Click here

C

GO TO SFI SYSTEM Click here

D

GO TO ECD SYSTEM Click here

E

GO TO ECD SYSTEM Click here

A

CHECK HARNESS AND CONNECTOR (POWER SOURCE)

Text in Illustration
*a	Rear view of harness connected (to Certification ECU (Smart Key ECU Assembly))

Disconnect the F65 certification ECU (smart key ECU assembly) connector.

Measure the voltage according to the value(s) in the table below.

Standard Voltage

Tester Connection	Condition	Specified Condition
F65-2 (+B) - Body ground	Always	9.5 to 16 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE

OK

CHECK HARNESS AND CONNECTOR (GROUND)

Text in Illustration
*a	Rear view of harness connected (to Certification ECU (Smart Key ECU Assembly))

Disconnect the F65 certification ECU (smart key ECU assembly) connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

Tester Connection	Condition	Specified Condition
F65-11 (E) - Body ground	Always	Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - STOP LIGHT SWITCH ASSEMBLY)

Disconnect the F65 certification ECU (smart key ECU assembly) connector.
Disconnect the A38 stop light switch assembly connector.