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Brake Warning Light does not Come ON: Procedure

WARNING: This page is about a different car, the 2009 Lexus IS 350 and 2009 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CAN COMMUNICATION SYSTEM 
    1. Check if a CAN communication system DTC is output. Refer to DIAGNOSIS SYSTEM .

      Result

      Result Proceed to
      DTC is not output A
      DTC is output B

    B → See step   6 

    A: Go to next step 

  2. CHECK MULTIPLEX COMMUNICATION SYSTEM 
    1. Check if a multiplex communication system DTC is output. Refer to DTC CHECK / CLEAR .

      Result

      Result Proceed to
      DTC is not output A
      DTC is output B

    B → See step   7 

    A: Go to next step 

  3. CHECK BRAKE WARNING LIGHT 
    1. Disconnect the skid control ECU connector.
    2. Turn the engine switch on (IG).
    3. Check that the brake warning light comes on.

      OK

      The brake warning light comes on.

      HINT: 

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part. Refer to PROBLEM SYMPTOMS TABLE .

    NG → See step   4 

    OK → See step   5 

  4. INSPECT COMBINATION METER ASSEMBLY 
    1. Turn the engine switch off.
    2. Reconnect the skid control ECU connector.
    3. Perform the Active Test of the combination meter (meter CPU) using the Techstream. Refer to DATA LIST / ACTIVE TEST .
    4. Check the combination meter.

      OK

      The brake warning light turns on or off in accordance with the Techstream operation.

      HINT: 

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step. Refer to PROBLEM SYMPTOMS TABLE .

    NG → See step   8 

    OK → See step   5 

  5. REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL 
  6. INSPECT CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  7. INSPECT MULTIPLEX COMMUNICATION SYSTEM. Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  8. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL