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Home >> Lexus >> 2006 >> IS 250 RWD, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Brake Control) >> VEHICLE STABILITY CONTROL SYSTEM (w/ VDIM) >> DTC C1249/49 Open in Stop Light Switch Circuit >> Wiring Diagram

DTC C1249/49 Open in Stop Light Switch Circuit: Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Wiring Diagram (1 Of 2)
G04052120Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Wiring Diagram (2 Of 2)
G04052121Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NOTE: When replacing the skid control ECU, perform zero point calibration (See CALIBRATION  ).
  1. INSPECT STOP SW FUSE 
    1. Remove the STOP SW fuse from the main body ECU RH.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      STOP SW (7.5 A) fuse Always Below 1 Ω
      Fig 3: Inspecting Stop SW Fuse
      G04052122Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPLACE STOP SW FUSE 

    OK : GO TO NEXT STEP 

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

      OK: 

      CONDITION CHART

      Condition Illumination Condition
      Brake pedal depressed ON
      Brake pedal released OFF

    NG : Go to step   9 

    OK : GO TO NEXT STEP 

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

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J77-10 (STP1) - Body ground Stop light switch ON (Brake pedal depressed) 8 to 14 V
      J77-10 (STP1) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V
      Fig 4: Inspecting Skid Control ECU (STP1 Terminal)
      G04052123Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    OK : GO TO NEXT STEP 

  4. INSPECT SKID CONTROL ECU (IG1 AND GND TERMINAL) 
    1. Disconnect the skid control ECU connectors.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J77-1 (IG1) - Body ground Engine switch on (IG) 10 to 14 V
    4. Turn the engine switch off.
    5. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J78-26 (GND1) - Body ground Always Below 1 Ω
      J78-14 (GND2) - Body ground Always Below 1 Ω
      A35-22 (GND3) - Body ground Always Below 1 Ω
      Fig 5: Inspecting Skid Control ECU (IG1 And GND Terminal)
      G04052124Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 OR GND CIRCUIT) 

    OK : GO TO NEXT STEP 

  5. READ VALUE OF INTELLIGENT TESTER (STOP LIGHT SWITCH AND BRAKE PEDAL LOAD SENSING SWITCH) 
    1. Reconnect the skid control ECU connectors.
    2. Connect the intelligent tester to the DLC3.
    3. Start the engine.
    4. Select the Data List mode on the intelligent tester.

      ABS / VSC: 

      NORMAL CONDITION CHART

      Item (Display) Measurement Item / Range (Display) Normal Condition
      STOP LAMP SW Stop light switch / ON or OFF ON: Brake pedal depressed
      OFF: Brake pedal released
      BRK PEDAL SW Brake pedal load sensing switch / ON or OFF ON: Brake pedal depressed
      OFF: Brake pedal released
    5. Check that the stop light display observed on the intelligent tester changes when the brake pedal is depressed.

      OK: When the brake pedal is depressed, the intelligent tester displays "ON". 

    6. Slowly depress the brake pedal, and check when the stop light switch and brake pedal load sensing switch turn ON.

      OK: First the stop light switch should turn ON, and then the brake pedal load sensing switch should turn ON. 

      Result 

      CONDITION CHART

      Condition Proceed to
      OK A
      NG (The turning on of the stop light switch is not confirmed) B
      NG (The brake pedal load sensing switch turns on first) C

    B : REPLACE SKID CONTROL ECU 

    C : Go to step   7 

    A : Go to next step 

  6. RECONFIRM DTC 
    1. Clear the DTC (See DTC CHECK / CLEAR  ).
    2. Check if the same DTC is recorded (See DTC CHECK / CLEAR  ).

      Result 

      CONDITION CHART

      Condition Proceed to
      DTC (C1249/49) is not output A
      DTC (C1249/49) is output B

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See PROBLEM SYMPTOMS TABLE  ).

    B : REPLACE SKID CONTROL ECU 

    A : USE SIMULATION METHOD TO CHECK 

  7. CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION 
    1. Check the brake pedal height and stop light switch installation (See ADJUSTMENT ).

      OK: The brake pedal and stop light switch are normal. 

    NG : ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH 

    OK : GO TO NEXT STEP 

  8. RECONFIRM DTC 
    1. Clear the DTC (See DTC CHECK / CLEAR  ).
    2. Check if the same DTC is recorded (See DTC CHECK / CLEAR  ).

      Result 

      CONDITION CHART

      Condition Proceed to
      DTC (C1249/49) is not output A
      DTC (C1249/49) is output B

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See PROBLEM SYMPTOMS TABLE  ).

    B : REPLACE BRAKE PEDAL SUB-ASSEMBLY (BRAKE PEDAL LOAD SENSING SWITCH) 

    A : USE SIMULATION METHOD TO CHECK 

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

      Standard voltage 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A22-2 - Body ground Always 10 to 14 V
      Fig 6: Inspecting Stop Light Switch (Power Source Terminal)
      G04052125Courtesy 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 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

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

    NG : REPLACE STOP LIGHT SWITCH 

    OK : GO TO NEXT STEP 

    Fig 7: Inspecting Stop Light Switch
    G04052126Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. INSPECT STOP LIGHT CONTROL RELAY 
    1. Remove the stop light control relay.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      3 - 4 Always Below 1 Ω

    NG : REPLACE STOP LIGHT CONTROL RELAY 

    Fig 8: Inspecting Stop Light Control Relay
    G04052127Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : GO TO NEXT STEP 

  12. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ENGINE ROOM NO. 2 RELAY BLOCK) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      A22-1 - Stop light control relay terminal 4 Always Below 1 Ω
      A22-1 - Body ground Always 10 kΩ or higher

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 9: Checking Harness And Connector (Stop Light Switch - Engine Room No. 2 Relay Block)
    G04052128Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : GO TO NEXT STEP 

  13. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM NO. 2 RELAY BLOCK) 
    1. Disconnect the skid control ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION AND SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      J77-10 (STP1) - Stop light control relay terminal 3 Always Below 1 Ω
      J77-10 (STP1) - Body ground Always 10 kΩ or higher
      Fig 10: Checking Harness And Connector (Skid Control ECU - Engine Room No.2
      G04052129Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : GO TO NEXT STEP 

  14. RECONFIRM DTC 
    1. Clear the DTC (See DTC CHECK / CLEAR  ).
    2. Check if the same DTC is recorded (See DTC CHECK / CLEAR  ).

      HINT:

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

      Result 

      CONDITION CHART

      Condition Proceed to
      DTC (C1249/49) is not output A
      DTC (C1249/49) is output B

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See PROBLEM SYMPTOMS TABLE  ).

    B : REPLACE SKID CONTROL ECU 

    A : INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT) 

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