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Home >> Toyota >> 2003 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 768 (Brakes - Abs With EBD & BA & TRAC & VSC (Diagnostics)) >> DTC C1380/64: Malfunction In Stop Light Relay System >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2005 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: When replacing the master cylinder solenoid, perform zero point 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 (STP TERMINAL VOLTAGE) 
    1. Disconnect the skid control ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION, CONDITION AND SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      S28-7 (STP) - Body ground Stop light switch ON (Brake pedal depressed) 8 TO 14 V
      S28-7 (STP) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V
      Fig 1: Inspecting Skid Control ECU (STP Terminal Voltage)
      G02584594Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) 
    2. OK: GO TO NEXT STEP 
  3. INSPECT SKID CONTROL ECU (STP2 TERMINAL) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION AND SPECIFIED CONDITION

      Tester Connection Specified Condition
      S28-7 (STP) - S28-45 (STP2) Below 1Ω
      Fig 2: Inspecting Skid Control ECU (STP2 Terminal)
      G02584595Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT) 
    2. OK: GO TO NEXT STEP 
  4. PERFORM ACTIVE TEST BY HAND-HELD TESTER (STOP LIGHT OPERATION RELAY) 
    1. Reconnect the skid control ECU connector.
    2. Connect the hand-held tester to the DLC3.
    3. Turn the ignition switch to the ON position and push the hand-held tester main switch ON.
    4. Select "ACTIVE TEST" mode on the hand-held tester.
      ACTIVE TEST REFERENCE CHART

      Item Vehicle Condition/Test Details Diagnostic Note
      STOP LIGHT RELAY Turns stop light operation relay ON/OFF Observe rear combination lamp (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 lamp by the handheld tester.

    OK: 

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

    1. NG: Go to step 5 
    2. OK: GO TO NEXT STEP 

      Go to step   8 

  5. INSPECT STOP LIGHT OPERATION RELAY (POWER SOURCE TERMINAL VOLTAGE) 
    1. Remove the stop light operation relay.
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION AND SPECIFIED CONDITION (1 OF 3)

      Tester Connection Specified Condition
      1 - Body ground 8 to 14 V
      5 - Body ground 8 to 14 V
      Fig 3: Identifying Stop Light Operation Relay
      G02584596Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR" REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 
    2. OK: GO TO NEXT STEP 
  6. INSPECT STOP LIGHT OPERATION RELAY 
    1. Measure the resistance according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION AND SPECIFIED CONDITION (2 OF 3)

      Tester Connection Specified Condition
      3-4 Below 1Ω
      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 1Ω (When battery positive voltage is applied to terminal 1 and battery negative voltage to terminal 2.)
      Fig 4: Inspecting Stop Light Operation Relay
      G02584597Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR STOP LIGHT OPERATION RELAY 
    2. OK: GO TO NEXT STEP 
  7. INSPECT SKID CONTROL ECU (STPO TERMINAL VOLTAGE) 
    1. Install the stop light operation relay.
    2. Disconnect the skid control ECU connector.
    3. Turn the ignition switch to the ON position.
    4. Measure the voltage according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION AND SPECIFIED CONDITION (3 OF 3)

      Tester Connection Specified Condition
      S28-16 (STPO) - Body ground 10 to 14 V
      Fig 5: Inspecting Skid Control ECU (STPO Terminal Voltage)
      G02584598Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STPO CIRCUIT) 
    2. OK: GO TO NEXT STEP 
  8. RECONFIRM PTC 
    1. Clear the DTC (see DTC CHECK/CLEAR  ).
    2. Check if the same DTC is detected (see DTC CHECK/CLEAR  ).

    HINT:

    Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

    Result: 

    RESULT DESCRIPTION

    DTC is output A
    DTC is not output B
    1. B: END 
    2. A: GO TO NEXT STEP 

      REPLACE MASTER CYLINDER SOLENOID (SEE  OVERHAUL  ) 

  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.

      Standard: 

      TESTER CONNECTION, CONDITION AND SPECIFIED CONDITION (1 OF 4)

      Tester Connection Condition Specified Condition
      S12-2 - Body ground Always 10 to 14 V
      Fig 6: Inspecting Stop Light Switch Assy (Power Source Terminal Voltage)
      G02584599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 
    2. OK: GO TO NEXT STEP 
  10. INSPECT STOP LIGHT SWITCH ASSY 
    1. Measure the resistance according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION, CONDITION AND SPECIFIED CONDITION (2 OF 4)

      Tester Connection Condition Specified Condition
      S12-1 - S12-2 Switch pin free Below 1Ω
      S12-1 - S12-2 Switch pin pushed in 10 kΩ or higher
      Fig 7: Inspecting Stop Light Switch Assy
      G02584600Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR STOP LIGHT SWITCH ASSY 
    2. OK: GO TO NEXT STEP 
  11. CHECK HARNESS AND CONNECTOR (BETWEEN STOP LIGHT SWITCH AND STOP LIGHT OPERATION RELAY) (SEE  HOW TO PROCEED WITH TROUBLESHOOTING  ) 
    1. Remove the stop light operation relay.
    2. Measure the resistance according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION AND SPECIFIED CONDITION (3 OF 4)

      Tester Connection Specified Condition
      S12-1-4 Below 1Ω
      S12-1 - Body ground 10 kΩ or higher
      Fig 8: Identifying Connectors (Stop Light Switch And Stop Light Operation Relay)
      G02584601Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: GO TO NEXT STEP 
  12. INSPECT STOP LIGHT OPERATION RELAY 
    1. Measure the resistance according to the value(s) in the table below.

      Standard: 

      TESTER CONNECTION AND SPECIFIED CONDITION (4 OF 4)

      Tester Connection Specified Condition
      3-4 Below 1Ω
      Fig 9: Inspecting Stop Light Operation Relay
      G02584602Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR STOP LIGHT OPERATION RELAY 
    2. OK: GO TO NEXT STEP 
  13. CHECK HARNESS AND CONNECTOR (BETWEEN REAR COMBINATION LAMP, BODY GROUND AND STOP LIGHT OPERATION RELAY) ( HOW TO PROCEED WITH TROUBLESHOOTING  ) 
    1. Disconnect the rear combination lamp connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard: 

      LH: 

      TESTER CONNECTION AND SPECIFIED CONDITION LH

      Tester Connection Specified Condition
      R14-1-3 Below 1Ω
      R14-1 - Body ground 10 kΩ or higher
      R14-6 - Body ground Below 1Ω

      RH: 

      TESTER CONNECTION AND SPECIFIED CONDITION RH

      Tester Connection Specified Condition
      R15-1-3 Below 1Ω
      R15-1 - Body ground 10 kΩ or higher
      R15-6 - Body ground Below 1Ω
      Fig 10: Identifying Connectors (Between Rear Combination Lamp, Body Ground And Stop Light Operation Relay)
      G02584603Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: GO TO NEXT STEP 

      END 

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