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HOMESERVICE MANUALSTOYOTA2025SEQUOIA CAPSTONEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 97 (SMART ACCESS SYSTEM (FOR START) - DIAGNOSTIC CODES)SMART ACCESS SYSTEM WITH PUSH-BUTTON START (FOR START FUNCTION)DTC B2284: BRAKE SIGNAL MALFUNCTION [10/2015 - 11/2017]DESCRIPTION
2025 Toyota Sequoia Capstone

DTC B2284: Brake Signal Malfunction [10/2015 - 11/2017]: Description

2025 Toyota Sequoia CapstoneSECTION Description
WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2024 Lexus RC 350, 2024 Lexus RC 300, 2023 Lexus RC 350, 2023 Lexus RC 300, and 2022 Lexus RC 350. However, it is still accessible from the selected car via links, so may be relevant.

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

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2284 Brake Signal Malfunction The brake signal sent via direct line and the brake signal sent via CAN communication do not match. (1-trip detection logic*)
  • AM2 fuse
  • STOP fuse
  • Stop light switch assembly
  • SFI system
  • Certification ECU (smart key ECU assembly)
  • Wire harness or connector
 DTC Output Confirmation Operation: 
  1. Connect the cable to the negative (-) battery terminal, release the brake pedal and wait at least 20 seconds. Then depress the brake pedal for 20 seconds or more.
  1. *: 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). 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.
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RELATED DATA LIST AND ACTIVE TEST ITEMS

DTC No. Data List and Active Test
B2284 Power Source Control 
  • Stop Light Switch1

Engine and ECT 

  • ST1
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.