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Home › Toyota › 2009 › 4Runner Limited, 4.7 T, AWD › Repair and Diagnosis › Brakes › Traction Control › Brake Control › Vehicle Stability Control System › DTC C1380/64 Stop Light Control Relay Malfunction › Inspection Procedure

Inspection Procedure

NOTE: When replacing the master cylinder solenoid, perform zero point calibration (See CALIBRATION  ).
  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 (STP TERMINAL) 
    1. Disconnect the skid control ECU connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE REFERENCE

      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

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

      Fig 1: Inspecting Skid Control ECU (STP Terminal)
      G05556561Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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 resistance 

      TESTER CONNECTION CONDITION CHART

      Tester Connection Condition Specified Condition
      S28-7 (STP) - S28-45 (STP2) Always Below 1 Ω

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

      Fig 2: Inspecting Skid Control ECU (STP2 Terminal)
      G05556562Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

  4. PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT OPERATION RELAY) 
    1. Reconnect the skid control ECU connector.
    2. Connect Techstream to the DLC3.
    3. Turn the ignition switch to ON and turn the Techstream main switch ON.
    4. Select "Active Test" mode on Techstream.

      ABS/VSC/TRAC 

      ACTIVE TEST REFERENCE

      Tester Display Test Part Control Range Diagnostic Note
      Stop Light Relay Operates stop light operation relay ON/OFF Observe rear combination light (Does not stay on for 5 sec. or more)
    5. Check that the stop light in the rear combination light turns on and off when the stop light operation relay is turned on and off using Techstream.

      OK: 

      The stop light turns on or off in accordance with Techstream. 

      OK: Go to step  8

      NG: Go to next step 

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

      Standard voltage 

      VOLTAGE REFERENCE

      Tester Connection Condition Specified Condition
      1 - Body ground Ignition switch ON 8 to 14 V
      5 - Body ground Always 8 to 14 V

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

      Fig 3: Inspecting Stop Light Operation Relay (Power Source Terminal)
      G05556563Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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 resistance 

      TESTER CONNECTION CONDITION CHART

      Tester Connection Condition Specified Condition
      3 - 4 Battery voltage is not applied to terminals 1 and 2 Below 1 Ω
      3 - 5 Battery voltage Is not applied to terminals 1 and 2 10 kΩ or higher
      3 - 4 Battery positive voltage Is applied to terminal 1 and battery negative voltage to terminal 2 10 kΩ or higher
      3 - 5 Battery positive voltage Is applied to terminal 1 and battery negative voltage to terminal 2 Below 1 Ω

      NG: REPLACE STOP LIGHT OPERATION RELAY 

      Fig 4: Inspecting Stop Light Operation Relay
      G04965497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

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

      Standard voltage 

      VOLTAGE REFERENCE

      Tester Connection Condition Specified Condition
      S28-16 (STPO) - Body ground Always 10 to 14 V

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

      Fig 5: Inspecting Skid Control ECU (STPO Terminal)
      G05556565Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

  8. RECONFIRM DTC  (See INSPECTION PROCEDURE  )

    B: CHECK FOR INTERMITTENT PROBLEMS  (See CHECK FOR INTERMITTENT PROBLEMS  )

    A: REPLACE MASTER CYLINDER SOLENOID  (See DISASSEMBLY )

  9. INSPECT STOP LIGHT SWITCH ASSEMBLY (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 

      w/o Rear Spoiler 

      VOLTAGE REFERENCE

      Tester Connection Condition Specified Condition
      S12-2 - Body ground Always 10 to 14 V

      w/ Rear Spoiler 

      VOLTAGE REFERENCE

      Tester Connection Condition Specified Condition
      S37-2 - Body ground Always 10 to 14 V

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

      Fig 6: Inspecting Stop Light Switch Assembly (Power Source Terminal)
      G06129497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

  10. INSPECT STOP LIGHT SWITCH ASSEMBLY 
    1. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION 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 ASSEMBLY 

      Fig 7: Inspecting Stop Light Switch Assembly
      G06129498Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

  11. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - STOP LIGHT OPERATION RELAY) 
    1. Remove the stop light operation relay.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      w/o Rear Spoiler 

      TESTER CONNECTION CONDITION CHART

      Tester Connection Condition Specified Condition
      S12-1 - 4 Always Below 1 Ω
      S12-1 - Body ground Always 10 kΩ or higher

      w/ Rear Spoiler 

      TESTER CONNECTION CONDITION CHART

      Tester Connection Condition Specified Condition
      S37-1 - 4 Always Below 1 Ω
      S37-1 - Body ground Always 10 kΩ or higher

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      Fig 8: Identifying Engine Room Relay Block
      G06129537Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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 resistance 

      TESTER CONNECTION CONDITION CHART

      Tester Connection Condition Specified Condition
      3 - 4 Battery voltage Is not applied to terminals 1 and 2 Below 1 Ω

      NG: REPLACE STOP LIGHT OPERATION RELAY 

      Fig 9: Inspecting Stop Light Operation Relay
      G04965497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

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

      Standard resistance: 

      for LH 

      TESTER CONNECTION CONDITION CHART

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

      for RH 

      TESTER CONNECTION CONDITION CHART

      Tester Connection Condition Specified Condition
      R15-1 -3 Always Below 1 Ω
      R15-1 - Body ground Always 10 kΩ or higher
      R15-6 - Body ground Always Below 1 Ω

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      Fig 10: Identifying Rear Combination Light Connector Terminal
      G05556570Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: REPLACE MASTER CYLINDER SOLENOID  (See DISASSEMBLY )

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