DTC B2284: Brake Signal Malfunction: Procedure

WARNING: This page is about a different car, the 2012 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR DTC (CAN COMMUNICATION SYSTEM)
1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Check for CAN communication system DTCs. Refer to HOW TO PROCEED WITH TROUBLESHOOTING .
  HINT:
  
  If the DTCs for the CAN communication system malfunction are output, inspect those DTCs first.
  
  OK
  
  No DTC is output.
NG → See step 6

OK: Go to next step
CHECK FOR DTC (ENGINE CONTROL SYSTEM)
1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Check for DTC P0500 (Vehicle speed sensor A).
  OK
  
  No DTC is output.
NG → See step 7

OK: Go to next step

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

Connect the Techstream to the DLC3.
Turn the engine switch on (IG).

Check the Data List for proper functioning of the stop light switch.

MAIN BODY

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

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

NG → See step 4

OK → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK)

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - INSTRUMENT PANEL JUNCTION BLOCK)

Disconnect the A1 switch connector.

Fig 1: Identifying A1 Switch And 2B Junction Block Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the 2B junction block connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A1-1 - 2B-12	Always	Below 1 Ω
A1-1 or 2B-12 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH - INSTRUMENT PANEL JUNCTION BLOCK)

OK: Go to next step

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - MAIN BODY ECU)

Disconnect the 2E junction block connector.

Fig 2: Checking Harness & Connector (Instrument Panel Junction Block - Main Body ECU)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the E50 ECU connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
2E-24 - E50-14 (STP)	Always	Below 1 Ω
2E-24 or E50-14 (STP) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - MAIN BODY ECU)

OK → REPLACE INSTRUMENT PANEL JUNCTION BLOCK

GO TO CAN COMMUNICATION SYSTEM. Refer to DIAGNOSTIC TROUBLE CODE CHART
GO TO ENGINE CONTROL SYSTEM. Refer to DTC P0500: Vehicle Speed Sensor "A"