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Home >> Toyota >> 2007 >> Avalon XLS >> Repair and Diagnosis >> Brakes >> Traction Control >> Brakes - Abs >> Vehicle Stability Control System >> DTC C1249/49 Open in Stop Light Switch Circuit >> Inspection Procedure

Inspection Procedure

NOTE: When replacing the ABS & TRACTION actuator assembly, perform zero point calibration (See CALIBRATION ).

HINT:

After steps 1, 2 and 3 are completed, start the inspection from step  4 when using the intelligent tester and start from step  5 when not using the intelligent tester.

  1. CHECK STOP LIGHT SWITCH OPERATION 
    1. Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released.

      OK: 

      Stop light switch function is normal. 

      HINT:

      Check the stop light bulb as it may have burnt out.

    NG:  Go to step  9

    OK: Go to Next Step 

  2. INSPECT SKID CONTROL ECU (STP1 TERMINAL VOLTAGE) 
    1. Disconnect the skid control ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

      Voltage 

      SKID CONTROL ECU (STP1 TERMINAL VOLTAGE)

      Tester Connection Condition Specified Condition
      A34-27(STP1) - Body ground Stop light switch ON (Brake pedal depressed) 8 to 14 V
      A34-27(STP1) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V
      Fig 1: Identifying Skid Control ECU Connector
      G05001572Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      DTC OUTPUT RESULT

      Result Proceed to
      OK (w/ Dynamic radar cruise control) A
      OK (w/o Dynamic radar cruise control) B
      NG C

    B:   Go to step  8

    C: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 CIRCUIT) 

    A: Go to Next Step 

  3. CHECK HARNESS AND CONNECTOR (STP1 TO STP2 CIRCUIT) 
    1. Measure the resistance according to the value(s) in the table below.

      Resistance 

      STP1 TO STP2 CIRCUIT

      Tester Connection Specified Condition
      A34-27 (STP1) - A34-21 (STP2) Below 1 Ω
      A34-27 (STP1) - Body ground 10 kΩ or higher
    Fig 2: Identifying Skid Control ECU Connector
    G05001573Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 TO STP2 CIRCUIT) 

    OK: Go to Next Step 

  4. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (STOP LIGHT RELAY) 
    1. Reconnect the skid control ECU connector.
    2. Connect the intelligent tester to the DLC3.
    3. Turn the ignition switch on (IG) and turn the intelligent tester main switch on.
    4. Select "ACTIVE TEST" on the intelligent tester.

      DATA LIST: ABS/VSC 

      DATA LIST: ABS/VSC

      Item Vehicle Condition / Test Details Diagnostic Note
      STOP LIGHT RELAY Turns stop light operation relay ON/OFF Observe rear combination light
      (Does not come on for 5 sec. or more)
    5. Check that "ON" and "OFF" of the stop light can be shown on the rear combination light by the intelligent tester.

      OK: 

      The stop light turns on or off in accordance with the intelligent tester. 

      HINT:

      Reinstall the sensors, connectors, etc. and restore the vehicle to its prior conditions before rechecking for DTCs.

    OK:  Go to step  8

    NG: Go to Next Step 

  5. INSPECT ENGINE ROOM R/B (BRK RELAY POWER SOURCE TERMINAL VOLTAGE) 
    1. Remove the BRK relay.
    2. Turn the ignition switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Voltage 

      ENGINE ROOM R/B (BRK RELAY POWER SOURCE TERMINAL VOLTAGE)

      Tester Connection Condition Specified Condition
      2 - Body ground IG switch on (IG) 8 to 14V
      5 - Body ground IG switch on (IG) 8 to 14 V
    Fig 3: Identifying BRK Relay
    G05001574Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

    OK: Go to Next Step 

  6. INSPECT BRK RELAY 
    1. Measure the resistance according to the value(s) in the table below.

      Resistance 

      BRK RELAY

      Tester Connection Specified Condition
      3 - 4 Below 1 Ω
      3 - 5 10 kΩ or higher
      3 - 4 10 kΩ or higher (When battery positive voltage is applied to terminal 1 and battery negative voltage to terminal 2.)
      3 - 5 Below 1 Ω (When battery positive voltage is applied to terminal 1 and battery negative voltage to terminal 2.)
    Fig 4: Inspecting Brk Relay
    G05001575Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE BRK RELAY 

    OK: Go to Next Step 

  7. INSPECT SKID CONTROL ECU CONNECTOR (STPO TERMINAL VOLTAGE) 
    1. Install the stop light operation (DAC) relay.
    2. Disconnect the skid control ECU connector.
    3. Turn the ignition switch on (IG).
    4. Measure the voltage according to the value(s) in the table below.

      Voltage 

      SKID CONTROL ECU CONNECTOR (STPO TERMINAL VOLTAGE)

      Tester Connection Condition Specified Condition
      A34-16 (STPO) - Body ground IG switch on (IG) 10 to 14 V
    Fig 5: Identifying Skid Control ECU Connector
    G05001576Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STPO CIRCUIT) 

    OK: Go to Next Step 

  8. RECONFIRM DTC 
    1. Clear the DTC.
    2. Depress the brake pedal several times to test the stop light circuit.
    3. Check if the same DTC is detected.

      HINT:

      Reinstall the sensors, connectors, etc. and restore the vehicle to its prior conditions before rechecking for DTCs.

    Result 

    DTC OUTPUT RESULT

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

    B: END 

    A: REPLACE ABS & TRACTION ACTUATOR ASSEMBLY 

  9. INSPECT STOP LIGHT SWITCH ASSEMBLY (POWER SOURCE TERMINAL VOLTAGE) 
    1. Disconnect the stop light switch connector.
    2. Measure the voltage according to the value(s) in the table below.

      Voltage 

      STOP LIGHT SWITCH ASSEMBLY (POWER SOURCE TERMINAL VOLTAGE)

      Tester Connection Condition Specified Condition
      A23-2 - Body ground Always 10 to 14 V
    Fig 6: Identifying Stop Light Switch Connector
    G05001577Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

    OK: Go to Next Step 

  10. INSPECT STOP LIGHT SWITCH ASSEMBLY 
    1. Disconnect the stop light switch assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      STOP LIGHT SWITCH ASSEMBLY

      Switch Condition Tester Connection Specified Condition
      Switch pin free 1 - 2 Below 1 Ω
      Switch pin pushed in 1 - 2 10 kΩ or higher
    Fig 7: Inspecting Stop Light Switch Assembly
    G05001578Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Result 

    DTC OUTPUT RESULT

    Result Proceed to
    OK (w/ Dynamic radar cruise control) A
    OK (w/o Dynamic radar cruise control) B
    NG C

    B:  Go to step  14

    C: REPLACE STOP LIGHT SWITCH ASSEMBLY 

    A: Go to Next Step 

  11. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH TO BRK RELAY) 
    1. Remove the BRK relay.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      STOP LIGHT SWITCH TO BRK RELAY

      Tester Connection Specified Condition
      A23-1 - BRK relay 4 Below 1 Ω
      A23-1 - Body ground 10 kΩ or higher
    Fig 8: Identifying Stop Light Switch And Brk Relay
    G05001579Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH TO BRK RELAY) 

    OK: Go to Next Step 

  12. INSPECT BRK RELAY 
    1. Measure the resistance according to the value(s) in the table below.

      Resistance 

      BRK RELAY

      Tester Connection Specified Condition
      3 - 4 Below 1 Ω
    Fig 9: Inspecting Brk Relay
    G05001575Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE BRK RELAY 

    OK: Go to Next Step 

  13. CHECK HARNESS AND CONNECTOR (BETWEEN REAR COMBINATION LIGHT, BODY GROUND AND BRK RELAY) 
    1. Disconnect the rear combination light connector.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      LH: 

      BETWEEN REAR COMBINATION LIGHT, BODY GROUND AND BRK RELAY LH

      Tester Connection Specified Condition
      K25-2 - BRK relay 3 Below 1 Ω
      K25-1 - Body ground 10 kΩ or higher
      K25-3 - Body ground Below 1 Ω

      RH: 

      BETWEEN REAR COMBINATION LIGHT, BODY GROUND AND BRK RELAY RH

      Tester Connection Specified Condition
      K29-2 - BRK relay 3 Below 1 Ω
      K29-1 - Body ground 10 kΩ or higher
      K29-3 - Body ground Below 1 Ω
    Fig 10: Identifying Rear Combination Light And Brk Relay
    G05001581Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT CIRCUIT) 

    OK: END 

  14. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH TO SKID CONTROL ECU) 
    1. Disconnect the stop light switch connector and skid control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Resistance 

      STOP LIGHT SWITCH TO SKID CONTROL ECU

      Tester Connection Specified Condition
      A34-27 (STP1) - A23-1 (STP) Below 1 Ω
    Fig 11: Identifying Stop Light Switch Connector And Skid Control ECU Connector
    G05001582Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH TO SKID CONTROL ECU) 

    OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT CIRCUIT) 

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