Toyota 4Runner manuals

Toyota 4Runner: 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)



NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

2.

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



NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

3.

INSPECT STOP LIGHT SWITCH ASSEMBLY

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



NG

REPLACE STOP LIGHT SWITCH ASSEMBLY


OK

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.

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

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

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)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

5.

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(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

-

OK:

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


OK

REPLACE POWER MANAGEMENT CONTROL ECU


NG

GO TO SFI SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

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