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Home >> Lexus >> 2018 >> ES 350 >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Smart Access System (For Start Function) (Diagnostic Codes & Symptom Tests) >> Smart Access System With Push-Button Start (For Start Function) >> DTC B2284: Brake Signal Malfunction (07/2015 -) >> Description
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DTC B2284: Brake Signal Malfunction (07/2015 -): 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.
  • ECU-B NO. 1fuse
  • STOP fuse
  • 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.
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.
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