2006 Scion xA AutomaticFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. CHECK OPERATION OF STOP LIGHT 
    1. Check whether the stop lights turn on and off normally when the brake pedal is depressed and released.

      OK: Stop lights turn ON when brake pedal is depressed. 

    NG : REPAIR OR REPLACE STOP LIGHT SWITCH CIRCUIT 

    OK : GO TO NEXT STEP 

  2. READ VALUE OF INTELLIGENT TESTER (STP SIGNAL) 
    1. Connect the intelligent tester to the DLC3.
    2. Turn the ignition switch ON and turn the tester ON.
    3. On the tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / STOP LIGHT SW.
    4. Read the value displayed on the tester.

      Standard 

      PEDAL OPERATION SPECIFIED CONDITION CHART

      Brake Pedal Operation Specified Condition
      Depressed STP Signal ON
      Released STP Signal OFF

    OK : CHECK FOR INTERMITTENT PROBLEMS 

    NG : GO TO NEXT STEP 

  3. INSPECT STOP LIGHT SWITCH ASSEMBLY 
    1. Check the resistance when the stop light switch is ON and OFF.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Switch Position Tester Connection Specified Condition
      ON (Free) 1 - 2 Below 1 Ω
      OFF (Pushed in) 1 - 2 10 kΩ or higher

    NG : REPLACE STOP LIGHT SWITCH ASSEMBLY 

    Fig 1: Identifying Stop Light Switch Terminals
    G04153167Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : GO TO NEXT STEP 

  4. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM) 
    1. Disconnect the S6 stop light switch connector.
      Fig 2: Identifying S6 Stop Light Switch Connector Terminals
      G04153168Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the E5 ECM connector.
    3. Measure the resistance of the wire harness side connector.

      Standard resistance (Check for open) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      S6-1 - STP (E5-4) Below 1 Ω

      Standard resistance (Check for short) 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      S6-1 or STP (E5-4) - Body ground 10 kΩ or higher
      Fig 3: Disconnecting E5 ECM Connector
      G04153169Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : REPLACE ECM 

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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