Toyota Tacoma (2015-2018) Service Manual: Brake Signal Malfunction (B2284)

Toyota Tacoma (2015-2018) Service Manual / 2gr-fks Starting / Smart Key System(for Start Function) / Brake Signal Malfunction (B2284)

DESCRIPTION

This DTC is stored when the brake signal sent via direct line and the brake signal sent via CAN communication do not match.

HINT:

When the cable is disconnected and reconnected to the negative (-) battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

DTC Code	DTC Detection Condition	Trouble Area	DTC Output Confirmation Operation
B2284	The brake signal sent via direct line and the brake signal sent via CAN communication (1-trip detection logic*) do not match.	AM2 NO. 2 fuse STOP fuse Stop light switch assembly SFI system Certification ECU (smart key ECU assembly) Wire harness or connector	Connect the cable to the negative (-) battery terminal, release the brake pedal and wait 20 seconds or more. Then depress the brake pedal for 20 seconds or more.

*: Only detected 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
With the electrical key transmitter sub-assembly in the cabin, even if an engine start operation is performed, the engine does not start (the indicator in the combination meter is not illuminated in green). However, the engine can be started by turning the engine switch on (ACC) and then pressing and holding it. If there is a malfunction when the direct line is on, the engine can be started by pressing the engine switch with the brake pedal released. If there is a malfunction when the direct line is off, the engine cannot be started by pressing the engine switch with the brake pedal depressed.	-

Vehicle Condition when Malfunction Detected

Fail-safe Function when Malfunction Detected

With the electrical key transmitter sub-assembly in the cabin, even if an engine start operation is performed, the engine does not start (the indicator in the combination meter is not illuminated in green). However, the engine can be started by turning the engine switch on (ACC) and then pressing and holding it.

If there is a malfunction when the direct line is on, the engine can be started by pressing the engine switch with the brake pedal released.
If there is a malfunction when the direct line is off, the engine cannot be started by pressing the engine switch with the brake pedal depressed.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

Check the connector connection to the terminal to make sure that there is no abnormality such as a loose connection, deformation, etc.

NOTICE:

When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
The smart key system (for Start Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting.
Click here

Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.
Before replacing the certification ECU (smart key ECU assembly), refer to the smart key system (for Start Function) precaution (See page ).
Inspect the fuses of circuits related to this system before performing the following inspection procedure.
After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

Related Data List and Active Test Items

DTC	Data List Item	Active Test Item
B2284	Power Source Control Stop Light Switch1 ABS/VSC/TRAC Stop Light SW	-

PROCEDURE

1.	READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH ASSEMBLY)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Power Source Control / Data List.

(e) Read the Data List according to the display on the Techstream.

Power Source Control

Tester Display	Measurement Item/Range	Normal Condition	Specified Condition
Stop Light Switch1	State of brake pedal/ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	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.

Tester Display

Measurement Item/Range

Normal Condition

Specified Condition

Stop Light Switch1

State of brake pedal/ON or OFF

ON: Brake pedal depressed

OFF: Brake pedal released

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

GO TO SFI SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE)

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

3.	CHECK HARNESS AND CONNECTOR (GROUND)

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

(a) Disconnect the C27 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the S10 stop light switch assembly connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
S10-2 - Body ground	Always	11 to 14 V

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
C27-2 (STP1) - S10-1	Always	Below 1 Ω

Text in Illustration

*a	Front view of wire harness connector (to Stop Light Switch Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Reconnect the C27 and C29 certification ECU (smart Key ECU assembly) connectors.

(b) Reconnect the S10 stop light switch assembly connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
C27-2 (STP1) - Body ground	Brake pedal released → depressed	1 V or less → 9 V or higher

Text in Illustration

*a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPLACE STOP LIGHT SWITCH ASSEMBLY

Lost Communication with ECM / PCM (U0100,U0140,U0142,U0155,U1117)

DESCRIPTION These DTCs are stored when there is a CAN communication malfunction between the certification ECU (smart key ECU assembly), ECM, main body ECU (multiplex network body ECU) or combinat ...

Steering Lock Position Signal Circuit Malfunction (B2285)

DESCRIPTION This DTC is stored when the steering lock position signal sent by the steering lock ECU (steering lock actuator or upr bracket assembly) via direct line and the steering lock position ...

Other materials:

Lost Communication with ECM (U0100,U0142,U0155)
DESCRIPTION DTC No. DTC Detecting Condition Trouble Area U0100 No communication with ECM CAN communication system ECM U0142 No communication with main body ECU ...

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Precaution
PRECAUTION 1. PRECAUTIONS WHEN USING TECHSTREAM (a) When using the Techstream to troubleshoot the engine immobiliser system: Connect the Techstream to the DLC3 while the ignition switch is off, and turn a door courtesy light switch on and off at 1.5-second intervals until communication betwee ...