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Home >> Toyota >> 2017 >> Camry LE >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Vehicle Stability Control System (Diagnostic Codes (C1201-U0073) & Symptom Tests) (Except Hybrid) >> Vehicle Stability Control System >> DTC C1426: Stop Light Switch OFF Stuck Malfunction [08/2015 - ] >> Procedure

DTC C1426: Stop Light Switch OFF Stuck Malfunction [08/2015 - ]: Procedure

  1. CHECK BRAKE PEDAL AND STOP LIGHT SWITCH ASSEMBLY INSTALLATION 
    1. Check the brake pedal height and stop light switch assembly installation. Refer to ADJUSTMENT [08/2015 - ] .

      OK

      The brake pedal height and stop light switch assembly installation are normal.

      HINT: 

      If the on/off status of the stop light switch assembly and the pressure increase information from the master cylinder pressure sensor do not match due to an improperly installed brake pedal or stop light switch assembly, this DTC may be stored. Therefore, be sure to check the installation condition of the pedal and switch before inspecting the input signals and other related parts.

    NG → See step   19 

    OK: Go to next step 

  2. CHECK STOP LIGHT OPERATION 
    1. Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.

      OK

      Condition Illumination Condition
      Brake pedal depressed. ON
      Brake pedal released. OFF

    NG → See step   5 

    OK: Go to next step 

  3. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH ASSEMBLY) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Select the Data List using the Techstream. Refer to DATA LIST / ACTIVE TEST [08/2015 - ] .
      ABS/VSC/TRAC

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Stop Light SW Stop light switch / ON or OFF ON: Brake pedal depressed
      OFF: Brake pedal released      		 -
    4. Check that the stop light switch display observed on the Techstream changes according to brake pedal operation.

      OK

      The Techstream displays on or off according to brake pedal operation.

    NG → See step   13 

    OK: Go to next step 

  4. RECONFIRM DTC 
    1. Turn the ignition switch off.
    2. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .
    3. Turn the ignition switch off.
    4. Start the engine.
    5. Depress the brake pedal several times to test the stop light circuit.
    6. Check if the same DTC is output. Refer to DTC CHECK / CLEAR [08/2015 - ] .

      Result

      Result Proceed to
      DTC C1426 is not output. A
      DTC C1426 is output. B

      HINT: 

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts. Refer to PROBLEM SYMPTOMS TABLE [08/2015 - ] .

    B → See step   15 

    A → See step   17 

  5. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) 
    1. Check that the STOP (7.5 A) fuse is normal.
      GTY321967Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
    3. Disconnect the stop light switch assembly connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A33-2 - Body ground Always 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Stop Light Switch Assembly)

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

    OK: Go to next step 

  6. INSPECT STOP LIGHT SWITCH ASSEMBLY 
    1. Measure the resistance according to the value(s) in the table below.
      GTY315344Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

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

      *a Component without harness connected
      (Stop Light Switch Assembly)

      Result

      Result Proceed to
      OK (w/ Dynamic Radar Cruise Control System) A
      OK (w/o Dynamic Radar Cruise Control System) B
      NG C

    B → See step   11 

    C → See step   18 

    A: Go to next step 

  7. CHECK HARNESS AND CONNECTOR (SWITCH INPUT TERMINAL) 
    1. Remove the stop light control relay (STOP relay).
      GTY318750Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Stop light control relay (STOP relay) terminal 4 - Body ground Stop light switch ON (Brake pedal depressed) 11 to 14 V*
      Stop light control relay (STOP relay) terminal 4 - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V

      HINT: 

      *: The standard voltage value varies depending on the +BS terminal voltage value. The standard voltage is 85% of the +BS terminal voltage.

      TEXT IN ILLUSTRATION

      *1 No. 2 Engine Room Relay Block and Junction Block Assembly
      *2 Stop Light Control Relay (STOP Relay)

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (SWITCH INPUT CIRCUIT) 

    OK: Go to next step 

  8. INSPECT STOP LIGHT CONTROL RELAY (STOP RELAY) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY472937Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 - 4 Voltage is not applied between terminals 1 and 2 Below 1 Ω
      3 - 4 Voltage is applied between terminals 1 and 2 10 kΩ or higher
      TEXT IN ILLUSTRATION

      *1 Stop Light Control Relay (STOP Relay)

    NG → REPLACE STOP LIGHT CONTROL RELAY (STOP RELAY) 

    OK: Go to next step 

  9. CHECK HARNESS AND CONNECTOR (STP TERMINAL) 
    1. Install the stop light control relay (STOP relay).
      GTY479934Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
    3. Disconnect the skid control ECU connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A94-30 (STP) - Body ground Stop light switch ON (Brake pedal depressed) 11 to 14 V*
      A94-30 (STP) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V
      A94-22 (STP2) - Body ground Stop light switch ON (Brake pedal depressed) 11 to 14 V*
      A94-22 (STP2) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V

      HINT: 

      *: The standard voltage value varies depending on the +BS terminal voltage value. The standard voltage is 85% of the +BS terminal voltage.

      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Actuator Assembly))

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

    OK: Go to next step 

  10. RECONFIRM DTC 
    1. Reconnect the skid control ECU connector.
    2. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .
    3. Turn the ignition switch off.
    4. Start the engine.
    5. Depress the brake pedal several times to test the stop light circuit.
    6. Check if the same DTC is output. Refer to DTC CHECK / CLEAR [08/2015 - ] .

      Result

      Result Proceed to
      DTC C1426 is not output. A
      DTC C1426 is output. B

      HINT: 

      • If the lighting system is normal but the DTC is still output, replace the skid control ECU (brake actuator assembly). Refer to REMOVAL [08/2015 - ] .
      • If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts. Refer to PROBLEM SYMPTOMS TABLE [08/2015 - ] .

    B → See step   16 

    A → See step   17 

  11. CHECK HARNESS AND CONNECTOR (STP TERMINAL) 
    1. Reconnect the stop light switch assembly connector.
      GTY477941Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
    3. Disconnect the skid control ECU connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A49-30 (STP) - Body ground*1
      A94-30 (STP) - Body ground*2      		 Stop light switch ON (Brake pedal depressed) 11 to 14 V*3
      A49-30 (STP) - Body ground*1
      A94-30 (STP) - Body ground*2      		 Stop light switch OFF (Brake pedal released) Below 1.5 V

      *1: for 2AR-FE

      *2: for 2GR-FE

      HINT: 

      *3: The standard voltage value varies depending on the +BS terminal voltage value. The standard voltage is 85% of the +BS terminal voltage.

      TEXT IN ILLUSTRATION

      *A for 2AR-FE
      *B for 2GR-FE
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Actuator Assembly))

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

    OK: Go to next step 

  12. RECONFIRM DTC 
    1. Reconnect the skid control ECU connector.
    2. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .
    3. Turn the ignition switch off.
    4. Start the engine.
    5. Depress the brake pedal several times to test the stop light circuit.
    6. Check if the same DTC is output. Refer to DTC CHECK / CLEAR [08/2015 - ] .

      Result

      Result Proceed to
      DTC C1426 is not output. A
      DTC C1426 is output. B

      HINT: 

      • If the lighting system is normal but the DTC is still output, replace the skid control ECU (brake actuator assembly). Refer to REMOVAL [08/2015 - ] .
      • If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts. Refer to PROBLEM SYMPTOMS TABLE [08/2015 - ] .

    B → See step   16 

    A → See step   17 

  13. CHECK HARNESS AND CONNECTOR (STP TERMINAL) 
    1. Turn the ignition switch off.
      GTY477941Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
    3. Disconnect the skid control ECU connector.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A49-30 (STP) - Body ground*1
      A94-30 (STP) - Body ground*2      		 Stop light switch ON (Brake pedal depressed) 11 to 14 V*3

      *1: for 2AR-FE (w/o Dynamic Radar Cruise Control System)

      *2: for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE

      HINT: 

      *3: The standard voltage value varies depending on the +BS terminal voltage value. The standard voltage is 85% of the +BS terminal voltage.

      TEXT IN ILLUSTRATION

      *A for 2AR-FE (w/o Dynamic Radar Cruise Control System)
      *B for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Actuator Assembly))

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

    OK: Go to next step 

  14. CHECK HARNESS AND CONNECTOR (GND1 TERMINAL) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY482147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      A49-38 (GND1) - Body ground*1
      A94-38 (GND1) - Body ground*2      		 Always Below 1 Ω

      *1: for 2AR-FE (w/o Dynamic Radar Cruise Control System)

      *2: for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE

      TEXT IN ILLUSTRATION

      *A for 2AR-FE (w/o Dynamic Radar Cruise Control System)
      *B for 2AR-FE (w/ Dynamic Radar Cruise Control System), 2GR-FE
      *a Front view of wire harness connector
      (to Skid Control ECU (Brake Actuator Assembly))

      HINT: 

      If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts. Refer to PROBLEM SYMPTOMS TABLE [08/2015 - ] .

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT) 

    OK → See step   15 

  15. REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 
  16. INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT). Refer to  PROBLEM SYMPTOMS TABLE [08/2015 - ] 
  17. CHECK FOR INTERMITTENT PROBLEMS. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - ] 
  18. REPLACE STOP LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [08/2015 - ] 
  19. ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH ASSEMBLY. Refer to  ADJUSTMENT [08/2015 - ] 
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