Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000ZNFA
Model Year Start: 2017 Model: Sienna Prod Date Range: [08/2016 -           ]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM(for Start Function): B2284; Brake Signal Malfunction; 2017 - 2020 MY Sienna [08/2016 -        ]

DTC

B2284

Brake Signal Malfunction

DESCRIPTION

This DTC is stored when a mismatch between the brake signal from the direct line and the brake signal sent via CAN communication is detected.

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 changes to on (IG).
  • When the battery cable is disconnected and reconnected, the power source returns to the mode it was in before the battery cable was disconnected.

DTC Code

DTC Detection Condition

Trouble Area

DTC Output Confirmation Operation

B2284

The brake signal information from the direct line and the brake signal information from the ECU via CAN communication are inconsistent (1-trip detection logic*).
  • STOP fuse
  • AM2 No. 2 fuse
  • Stop light switch assembly
  • Engine control system
  • Power management control ECU
  • Harness or connector

Connect the cable to the negative (-) battery terminal, turn the brakes off for 20 seconds or more and then turn them on for 20 seconds or more.
  • *: Only output 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

When the key is inside the vehicle, the engine does not start even though an engine start operation is performed (the engine switch indicator does not illuminate in green). However, if the engine switch is pressed and held for a certain period of time after the power source mode is changed to on (ACC), the engine can be started.

  • When a direct line ON malfunction is present, the engine can be started by pressing the engine switch even if the brakes are off.
  • When a direct line OFF malfunction is present, the engine cannot be started by pressing the engine switch even if the brakes are on.

-

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the engine switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins, or 2) connect the Techstream to the vehicle, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes.
  • The smart key system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting (See page 2017 MY Sienna [08/2016 - 11/2017]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING 2018 - 2020 MY Sienna [11/2017 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING ).
  • 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

Powertrain / Engine and ECT

  • ST1

-

PROCEDURE

1.

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH1)

(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

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

OK

GO TO SFI SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

NG

2.

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

2016 - 2020 MY Sienna [12/2015 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM(for Start Function): B2271; Ignition Hold Monitor Malfunction+

NG

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

3.

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

2016 - 2020 MY Sienna [12/2015 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM(for Start Function): B2271; Ignition Hold Monitor Malfunction+

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

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

(a) Disconnect the A35 power management control ECU connector.

(b) Disconnect the A58*1 or A59*2 stop light switch assembly connector.

  • *1: for Bulb Type Stop Light
  • *2: for LED Type Stop Light

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

Standard Resistance:

for Bulb Type Stop Light

Tester Connection

Condition

Specified Condition

A35-11 (STP1) - A58-1

Always

Below 1 Ω

A35-11 (STP1) or A58-1 - Body ground

Always

10 kΩ or higher

for LED Type Stop Light

Tester Connection

Condition

Specified Condition

A35-11 (STP1) - A59-2 (L)

Always

Below 1 Ω

A35-11 (STP1) or A59-2 (L) - Body ground

Always

10 kΩ or higher

(d) Reconnect the A58*1 or A59*2 stop light switch assembly connector.

  • *1: for Bulb Type Stop Light
  • *2: for LED Type Stop Light

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A35-11 (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

*a

Rear view of wire harness connector

(to Power Management Control ECU)
OK

REPLACE POWER MANAGEMENT CONTROL ECU

(See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; POWER DISTRIBUTION: POWER MANAGEMENT CONTROL ECU: REMOVAL 2018 - 2020 MY Sienna [11/2017 -        ]; POWER DISTRIBUTION: POWER MANAGEMENT CONTROL ECU: REMOVAL )
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR