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Home >> Scion >> 2004 >> xB Standard >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Abs With EBD & BA & TRAC & VSC System - Diagnosis >> DTC C1249/49: Open Circuit In Stop Light Switch Circuit >> Inspection Procedure

Inspection Procedure

  1. CHECK STOP LAMP SWITCH OPERATION (STOP LAMP SWITCH CIRCUIT) 
    1. Check that the stop light comes on when the brake pedal is depressed and turns off when the brake pedal is released.

      Standard: 

      Stop lamp switch function normal. 

    1. NG: Go to step   4 
    2. OK: Go to next step. 
  2. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (STP TERMINAL) 
    1. Disconnect the skid control ECU connector.
    2. Measure the voltage according to the value (s) in the table below.

      Standard: 

      STP TERMINAL VOLTAGE

      Tester Connection Condition Specified condition
      STP1 (S3-27) - Body ground Brake pedal depressed 11 to 14 V S3
      Brake pedal released 1.5 V or less
      Fig 1: Identifying STP Terminal
      G03367848Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: Go to step 3 
    2. OK: REPLACE BRAKE ACTUATOR ASSY (See  BRAKE ACTUATOR ASSY  ) 
      NOTE: When replacing the brake actuator assy, perform the zero point calibration (See  CALIBRATION   ). 
  3. CHECK HARNESS AND CONNECTOR (STOP LAMP SWITCH - SKID CONTROL ECU) 
    1. Disconnect the stop lamp switch connector and skid control ECU connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard: 

      STOP LAMP SWITCH - SKID CONTROL ECU RESISTANCE

      Tester Connection Specified Condition
      STP1 (S3-27) - STP (S8-1) 1 Ω or less
      Fig 2: Identifying Stop Lamp Switch - Skid Control ECU Terminals
      G03367849Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: Go to next step. 
  4. INSPECT STOP LAMP SWITCH ASSY 
    1. Disconnect the stop lamp switch assy connector.
    2. Measure the resistance according to the value (s) in the table below.

      Standard: 

      STOP LAMP SWITCH ASSY RESISTANCE

      Switch condition Tester connection Specified condition
      Switch pin free 1 - 2 1 Ω or less
      Switch pin pushed in 1 - 2 10 kΩor higher
      Fig 3: Inspecting Stop Lamp Switch Assy
      G03367850Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE STOP LAMP SWITCH ASSY 
    2. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 
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