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Home >> Toyota >> 2007 >> Avalon Limited >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Cruise Control System >> Dynamic Laser Cruise Control System >> DTC P0571 Brake Switch "A" Circuit >> Inspection Procedure

Inspection Procedure

  1. READ VALUE OF INTELLIGENT TESTER 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch on, and turn the intelligent tester main switch on.
    3. Check the DATA LIST for proper functioning of the stop light switch.

    CC (ECM): 

    DATA LIST

    Tester Display Measurement Item/Range Normal Condition Diagnostic Note
    STP LIGHT SW M Stop light switch signal (Main CPU)/ON or OFF ON: Brake pedal depressed
    OFF: Brake pedal released    		 -

    OK: 

    When brake pedal operation is performed, the result will be same as above. 

    OK: REPLACE ECM 

    NG: Go to Next Step 

  2. INSPECT STOP LIGHT SWITCH 
    1. Disconnect the stop light switch assembly connector.
    2. Measure the resistance according to the values in the table below.

      Standard resistance 

      Fig 1: Inspecting Stop Light Switch
      G05005594Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      RESISTANCE SPECIFICATION

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

    NG: REPLACE STOP LIGHT SWITCH 

    OK: Go to Next Step 

  3. CHECK WIRE HARNESS (STOP LIGHT SWITCH - BATTERY) 
    1. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Condition Specified Condition
      A23-2 - Body ground Always 10 to 14 V
      A23-3 - Body ground Engine switch on (IG) 10 to 14 V
    Fig 2: Identifying Stop Light Switch Connector Terminals
    G05005595Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  4. CHECK HYBRID VEHICLE CONTROL ECU 
    1. Reconnect the stop light switch connector.
    2. Disconnect the A24 connector from the ECM.
      3. Fig 3: Disconnecting A24 Connector From ECM
      G05005596Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Turn the ignition switch on (IG).
    4. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION

      Tester Connection Brake Pedal Condition Specified Condition
      A24-15 (STP) - Body ground Depressed 10 to 14 V
      A24-15 (STP) - Body ground Released Below 1 V
      A24-16 (ST1-) - Body ground Depressed Below 1 V
      A24-16 (ST1-) - Body ground Released 10 to 14 V

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH - ECM) 

    OK: REPLACE ECM 

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