DTC B2284: Brake Signal Malfunction: Procedure

1. Delete the DTC. Refer to DTC CHECK / CLEAR .
2. Check for the multiplex network communication system DTCs B1210, B1214 and B1215.

   HINT: 

   If the DTCs for the multiplex network communication system malfunction are output, inspect those DTCs first. Refer to DIAGNOSTIC TROUBLE CODE CHART .

   OK

   No DTC is output.

NG → GO TO MULTIPLEX COMMUNICATION SYSTEM 

OK: Go to next step 

1. Delete the DTC. Refer to DTC CHECK / CLEAR .
2. Check for the CAN communication system DTC U0146.

   HINT: 

   If the DTCs for the CAN communication system malfunction are output, inspect those DTCs first. Refer to HOW TO PROCEED WITH TROUBLESHOOTING .

   OK

   No DTC is output.

NG → GO TO CAN COMMUNICATION SYSTEM 

OK: Go to next step 

1. Remove the STOP SW fuse from the cowl side J/B RH.
2. Measure the resistance of the fuse.

   Standard resistance

   Below 1 Ω

NG → REPLACE FUSE 

OK: Go to next step 

1. Check that the connectors are securely connected and the terminals are not deformed or loose.

   OK

   The connectors are securely connected and the terminals are not deformed or loose.

NG → REPAIR OR REPLACE CONNECTORS 

OK: Go to next step 

1. Disconnect the ECU connector.
   Fig 1: Identifying Terminal GND2 Of J55 Power Source Control ECU Connector

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

   Standard resistance

   Tester Connection (Symbols)	Condition	Specified Condition
   J55-6 (GND2) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the volage according to the value(s) in the table below.
   Fig 2: Identifying Terminal STP Of J55 Power Source Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection (Symbols)	Condition	Specified Condition
   J55-1 (STP) - Body ground	Brake pedal released	Below 1 V
   J55-1 (STP) - Body ground	Brake pedal depressed	10 to 14 V

OK → See step   8 

NG: Go to next step 

1. Remove the switch.
   Fig 3: Inspecting Stop Light Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance of the switch.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   1 - 2	Switch pin free	Below 1 Ω
   3 - 4	Switch pin free	10 kΩ or higher
   1 - 2	Switch pin pushed in	10 kΩ or higher
   3 - 4	Switch pin pushed in	Below 1 Ω

NG → REPLACE STOP LIGHT SWITCH 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Reconnect the connectors.
2. Check the DATA LIST for proper functioning of the stop light switch.
   BODY:
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Stop Light SW	Stop light switch 1/ ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

   OK

   ON (brake pedal depressed) and OFF (brake pedal released) appear on the screen.

NG → REPLACE POWER SOURCE CONTROL ECU 

OK → REPLACE ECM