Dtc C1426 Stop Light Switch Off Stuck Malfunction

Brake. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
Brake Control Dynamic Control Systems. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STOP LIGHT OPERATION

READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SW/BRAKE PEDAL LOAD SENSING SW)

RECONFIRM DTC

INSPECT STOP LIGHT SWITCH ASSEMBLY

CHECK TERMINAL VOLTAGE (STP TERMINAL)

ADJUST BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

RECONFIRM DTC

DTC C1426 Stop Light Switch OFF Stuck Malfunction


DESCRIPTION

The skid control ECU (brake actuator assembly) receives stop light switch signals and brake operation condition information.

DTC Code
DTC Detection Condition
Trouble Area
C1426
When the brake pedal load sensing switch is on, the master cylinder pressure is 2 MPa or higher and the deceleration calculated from the vehicle speed is 0.2 G or more, the stop light switch is off for 2 seconds or more.
  1. STOP fuse
  2. Stop light switch
  3. Stop light switch circuit
  4. Skid control ECU (Brake actuator assembly)
  5. Brake pedal height and stop light switch installation
  6. Brake with switch pedal sub-assembly

WIRING DIAGRAM

Refer to DTC C1422 (HILUX_TGN26 RM000000XIG0E1X_04.html).

INSPECTION PROCEDURE

NOTICE:
  1. After replacing the brake actuator assembly, perform calibration (HILUX_TGN26 RM000000XIG0E1X.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  3. Before disconnecting the connector, make sure that there are no problems with the connection.
  4. After disconnecting the connector, make sure that the connector case and terminals are not deformed or corroded.
1.CHECK STOP LIGHT OPERATION

  1. Check that the stop light LH and RH 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
Go to step 4
OK


2.READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SW/BRAKE PEDAL LOAD SENSING SW)

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Chassis / ABS/VSC/TRC / Data List.

    ABS/VSC/TRC
    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
    		-
    Brake Pedal Load Sensing SW
    		Brake pedal load sensing switch / ON or OFF
    		ON: Brake pedal depressed beyond specified point
    OFF: Brake pedal not depressed beyond specified point
    		-

  1. Check that the stop light switch display and brake pedal load sensing switch display observed on the intelligent tester change according to the brake pedal operation.

    OK:
    The intelligent tester displays ON or OFF according to brake pedal operation.

  1. Slowly depress the brake pedal and check when the stop light switch and brake pedal load sensing switch are turned on.

    OK:
    The stop light switch turns on first, and then the brake pedal load sensing switch turns on.
    Result
    Result
    		Proceed to
    OK
    		A
    NG (Turning on of stop light switch is not confirmed)
    		B
    NG (Brake pedal load sensing switch turns on first)
    		C


B
Go to step 5

C
Go to step 6
A


3.RECONFIRM DTC

  1. Clear the DTC (HILUX_TGN26 RM000000XHV0CGX.html).

  1. Turn the ignition switch off.

  1. Start the engine.

  1. Depress the brake pedal several times to test the stop light circuit.

  1. Check if the same DTC is output (HILUX_TGN26 RM000000XHV0CGX.html).

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


B
REPLACE BRAKE ACTUATOR ASSEMBLY (HILUX_TGN26 RM0000010K000WX.html)
A

USE SIMULATION METHOD TO CHECK (HILUX_TGN26 RM000004QR7002X.html)

4.INSPECT STOP LIGHT SWITCH ASSEMBLY

  1. Turn the ignition switch off.

  1. Remove the stop light switch assembly (HILUX_TGN26 RM0000018VF00UX.html).

  1. Inspect the stop light switch assembly (HILUX_TGN26 RM0000018VE00SX.html).



NG
REPLACE STOP LIGHT SWITCH ASSEMBLY (HILUX_TGN26 RM0000018VF00UX.html)
OK


5.CHECK TERMINAL VOLTAGE (STP TERMINAL)

  1. Turn the ignition switch off.

  1. Disconnect the skid control ECU (brake actuator assembly) connector.



    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1426 Stop Light Switch Off Stuck Malfunction

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A36-2 (STP) - Body ground
    		Brake pedal depressed
    		8 to 14 V
    Brake pedal released
    		Below 1.5 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Skid Control ECU [Brake Actuator Assembly])


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (HILUX_TGN26 RM0000010K000WX.html)

6.ADJUST BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

  1. Adjust the brake pedal height and stop light switch installation (HILUX_TGN26 RM0000010K5010X.html).


NEXT


7.RECONFIRM DTC

  1. Clear the DTC (HILUX_TGN26 RM000000XHV0CGX.html).

  1. Turn the ignition switch off.

  1. Start the engine.

  1. Depress the brake pedal several times to test the stop light circuit.

  1. Check if the same DTC is output (HILUX_TGN26 RM000000XHV0CGX.html).

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


B
REPLACE BRAKE WITH SWITCH PEDAL SUB-ASSEMBLY (HILUX_TGN26 RM0000010K801DX.html)
A

END