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Home >> Lexus >> 2011 >> LX 570 >> Repair and Diagnosis >> Accessories & Equipment >> Anti-Theft Systems >> Smart Access System With Push-Button Start (For Start Function) (Diagnostic Codes & Circuit Tests) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function) >> DTC B2284: Brake Signal Malfunction (08/2010 - 08/2011) >> Procedure

DTC B2284: Brake Signal Malfunction (08/2010 - 08/2011): Procedure

  1. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH) 
    1. Use the Data List to check if the stop light switch is functioning properly.
      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      		 -
      RESULT

      Result Proceed to
      Display on the Techstream does not change according to brake pedal operation A
      Display on the Techstream changes according to brake pedal operation B

    B → REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) 

    A: Go to next step 

  2. INSPECT FUSE (STOP) 
    1. Remove the STOP fuse from the engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      STOP fuse Always Below 1 Ω

    NG → REPLACE FUSE 

    OK: Go to next step 

  3. INSPECT STOP LIGHT SWITCH ASSEMBLY 
    Fig 1: Identifying Stop Light Switch Connector
    GTY148574Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A30 stop light switch connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      1 - 2 Stop light switch pin not pushed Below 1 Ω
      3 - 4 Stop light switch pin pushed Below 1 Ω
      1 - 2 Stop light switch pin pushed 10 kΩ or higher
      3 - 4 Stop light switch pin not pushed 10 kΩ or higher

    NG → See step   5 

    OK: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - BATTERY AND MAIN BODY ECU) 
    Fig 2: Identifying Main Body ECU Connector And Stop Light Switch Connector
    GTY148575Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the 2B main body ECU connector.
    2. Disconnect the A30 stop light switch connector.
    3. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A30-2 - Body ground Always 11 to 14 V

      Standard Resistance

      Tester Connection Condition Specified Condition
      2B-22 (STP) - A30-1 Always Below 1 Ω
      2B-22 (STP) or A30-1 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) 

  5. REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL 
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