DTC B2284: Brake Signal Malfunction: Procedure

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU) 

OK: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND) 

OK: Go to next step 

1. Remove the stop light switch assembly. Refer to REMOVAL .
   Fig 1: Inspecting Stop Light Switch Assembly Operation

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1 - 2	Pushed	10 kΩ or higher
   3 - 4	Pushed	10 kΩ or higher
   1 - 2	Not pushed	Below 1 Ω
   3 - 4	Not pushed	Below 1 Ω

NG → See step   6 

OK: Go to next step 

1. Disconnect the D42 connector from the power management control ECU.
   Fig 2: Checking Stop Light Switch Assembly & Power Management Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D42-10 (STP1) - A35-1	Always	Below 1 Ω
   D42-10 (STP1) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1

   Front view of wire harness connector (to Power Management Control ECU)

   *2

   Front view of wire harness connector (to Stop Light Switch Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU) 

OK: Go to next step 

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. Read the Data List according to the display on the Techstream.
   POWER SOURCE CONTROL
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Specified Condition
   Stop Light Switch1	Stop light switch1/ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

   Result

   Result	Proceed to
   ON and OFF do not appear on the screen.	A
   ON and OFF appear on the screen (for 2GR-FE).	B
   ON and OFF appear on the screen (for 1AR-FE).	C

B → See step   7 

C → See step   8 

A → See step   9