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Home >> Toyota >> 2005 >> Avalon XLS >> Repair and Diagnosis >> Brakes >> Traction Control >> Brakes - Abs With EBD & BA & TRAC & VSC (Diagnostics) >> DTC C1249/49: Open Circuit In Stop Light Switch Circuit >> Inspection Procedure

Inspection Procedure

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

HINT:

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

    1. NG: Go to step   9 . 

      HINT:

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

    2. 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.
    Fig 1: Identifying Skid Control ECU Connector Terminal STP1
    G02976605Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - 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

    Result: 

    RESULT

    OK (w/Dynamic radar cruise control) A
    OK (w/o Dynamic radar cruise control) B
    NG C
    1. B: Go to step   8 . 
    2. C: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 CIRCUIT) 
    3. 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.
    Fig 2: Identifying Skid Control ECU Connector Terminals
    G02976606Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - RESISTANCE

    Tester Connection Specified Condition
    A34-27 (STP1) - A34-21 (STP2) Below 1 Ω
    A34-27 (STP1) - Body ground 10 kΩ or higher
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 TO STP2 CIRCUIT) 
    2. OK: Go to next step. 
  4. PERFORM ACTIVE TEST BY HAND HELD TESTER (STOP LIGHT RELAY) 
    1. Reconnect the skid control ECU connector. 
    2. Connect the hand held tester to the DLC3. 
    3. Turn the ignition switch on (IG) and turn the hand held tester main switch on. 
    4. Select "ACTIVE TEST" on the hand held 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 handheld tester.

      OK: 

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

    HINT:

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

    1. NG: Go to step 5 
    2. OK: Go to step   8 . 
  5. INSPECT ENGINE ROOM R/B (BRAKE RELAY POWER SOURCE TERMINAL VOLTAGE) 
    1. Remove the brake relay.
    2. Turn the ignition switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.
    Fig 3: Identifying Brake Relay Terminals
    G02976607Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - VOLTAGE

    Tester Connection Condition Specified Condition
    2 - Body ground IG switch on (IG) 8 to 14 V
    5 - Body ground IG switch on (IG) 8 to 14 V
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 
    2. OK: Go to next step. 
  6. INSPECT BRAKE RELAY 
    1. Measure the resistance according to the value(s) in the table below.
    Fig 4: Identifying Brake Relay Circuit
    G02976608Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - RESISTANCE

    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.)
    1. NG: REPLACE BRAKE RELAY 
    2. 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.
    Fig 5: Identifying Skid Control ECU Connector Terminal STPO
    G02976609Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - VOLTAGE

    Tester Connection Condition Specified Condition
    S34-16 (STPO) - Body ground IG switch on (IG) 10 to 14 V
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STPO CIRCUIT) 
    2. OK: Go to next step. 
  8. RECONFIRM DTC (SEE  DTC CHECK/CLEAR   ) 
    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: 

    RESULT

    DTC is output A
    DTC is not output B
    1. B: END 
    2. A: REPLACE ABS & TRACTION ACTUATOR ASSY (SEE  REPLACEMENT  ) 
  9. INSPECT STOP LIGHT SWITCH ASSY (POWER SOURCE TERMINAL VOLTAGE) 
    1. Disconnect the stop light switch connector.
    2. Measure the voltage according to the value(s) in the table below.
    Fig 6: Identifying Stop Light Switch Connector Terminals
    G02976610Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - RESISTANCE

    Tester Connection Condition Specified Condition
    A23-2 - Body ground Always 10 to 14 V
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 
    2. OK: Go to next step. 
  10. INSPECT STOP LIGHT SWITCH ASSY 
    1. Disconnect the stop light switch assy connector.
    2. Measure the resistance according to the value(s) in the table below.
    Fig 7: Identifying Stop Light Switch Assy Connector Terminals
    G02976611Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - RESISTANCE

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

    Result: 

    RESULT

    OK (w/Dynamic radar cruise control) A
    OK (w/o Dynamic radar cruise control) B
    NG C
    1. B: Go to step   14 . 
    2. C: REPLACE STOP LIGHT SWITCH ASSY 
    3. A: Go to next step. 
  11. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH TO BRAKE RELAY) (SEE  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
    1. Remove the brake relay.
    2. Measure the resistance according to the value(s) in the table below.
    Fig 8: Identifying Brake Relay Terminals
    G02976612Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - RESISTANCE

    Tester Connection Specified Condition
    A23-1 - Brake relay 4 Below 1 Ω
    A23-1 - Body ground 10 kΩ or higher
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH TO BRAKE RELAY) 
    2. OK: Go to next step. 
  12. INSPECT BRAKE RELAY 
    1. Measure the resistance according to the value(s) in the table below.
    Fig 9: Identifying Brake Relay Circuit
    G02976613Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - RESISTANCE

    Tester Connection Specified Condition
    3 - 4 Below 1 Ω
    1. NG: REPLACE BRAKE RELAY 
    2. OK: Go to next step. 
  13. CHECK HARNESS AND CONNECTOR (BETWEEN REAR COMBINATION LIGHT, BODY GROUND AND BRAKE RELAY) (SEE  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
    1. Disconnect the rear combination light connector.
    2. Measure the resistance according to the value(s) in the following 2 tables.
    Fig 10: Identifying Rear Combination Light Connector Terminals
    G02976614Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    LH: 

    TESTER CONNECTION AND SPECIFIED CONDITION RESISTANCE - LH

    Tester Connection Specified Condition
    L27-2 - Brake relay 3 Below 1 Ω
    L27-1 - Body ground 10 kΩ or higher
    L27-3 - Body ground Below 1 Ω

    RH: 

    TESTER CONNECTION AND SPECIFIED CONDITION RESISTANCE - RH

    Tester Connection Specified Condition
    L31-2 - Brake relay 3 Below 1 Ω
    L31-1 - Body ground 10 kΩ or higher
    L31-3 - Body ground Below 1 Ω
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT CIRCUIT) 
    2. OK: END 
  14. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH TO SKID CONTROL ECU) (SEE  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 
    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.
    Fig 11: Identifying Stop Light Switch Connector & Skid Control ECU Connector Terminal STP1
    G02976615Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard: 

    TESTER CONNECTION AND SPECIFIED CONDITION - RESISTANCE

    Tester Connection Specified Condition
    A34-27 (STP1) - A23-1 (STP) Below 1 Ω
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH TO SKID CONTROL ECU) 
    2. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT CIRCUIT) 
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