Toyota 4Runner: Brake Signal Malfunction (B2284)

Toyota 4Runner Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System(for Start Function) / Brake Signal Malfunction (B2284)

DESCRIPTION

This DTC is stored when the brake signal information from the cable and the brake signal information from the CAN communication line are inconsistent

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
B2284	The brake signal information from the cable and the brake signal information from the CAN communication line are inconsistent.	STOP fuse AM2 fuse Stop light switch assembly SFI system Power management control ECU Harness or connector

WIRING DIAGRAM

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.

HINT:

Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Inspect the stop light switch assembly (See page ).

REPLACE STOP LIGHT SWITCH ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - STOP LIGHT SWITCH ASSEMBLY)

(a) Disconnect the F81 power management control ECU connector.

(b) Disconnect the A47 stop light switch assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F81-11 (STP1) - A47-3 (L)	Always	Below 1 Ω
F81-11 (STP1) - Body ground	Always	10 kΩ or higher

(d) Reconnect the A47 stop light switch assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
F81-11 (STP1) - Body ground	Brake pedal not depressed	Below 1 V
F81-11 (STP1) - Body ground	Brake pedal depressed	([Voltage at terminal AM21 or AM22] minus 2.0 V) or higher

Text in Illustration

*a	Rear view of wire harness connector (to Power Management Control ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

(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) According to the display on the Techstream, read the Data List.

Power Source Control

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Stop Light Switch1	Stop light switch 1 / ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Stop Light Switch1

Stop light switch 1 / ON or OFF

ON: Brake pedal depressed

OFF: Brake pedal released

OK:

ON (brake pedal depressed) or OFF (brake pedal released) appears on the screen according to the stop light switch condition.

REPLACE POWER MANAGEMENT CONTROL ECU

GO TO SFI SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

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