DTC B2284: Brake Signal Malfunction [08/2015 - 08/2019]: Procedure

See step  1

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

See step  2

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Inspect the stop light switch assembly (Refer to ON-VEHICLE INSPECTION [08/2015 - 08/2019] ).

Result: 

NG 

REPLACE STOP LIGHT SWITCH ASSEMBLY 

(Refer to REMOVAL [08/2015 - ] )

Result: 

OK 

See step  4

1. Disconnect the F81 power management control ECU connector.
2. Disconnect the A47 stop light switch assembly connector.
3. 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

4. Reconnect the A47 stop light switch assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

5. 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)

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Power Source Control / Data List.
5. 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.

Result: 

OK 

REPLACE POWER MANAGEMENT CONTROL ECU 

(Refer to REMOVAL [08/2015 - 08/2019] )

Result: 

NG 

GO TO SFI SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - ] )