Dtc C1426 Stop Light Switch Off Stuck Malfunction

Brake. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Brake Control. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STOP LIGHT OPERATION

READ VALUE ON INTELLIGENT TESTER (STOP LIGHT SWITCH)

RECONFIRM DTC

INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL)

INSPECT STOP LIGHT SWITCH

INSPECT STOP LIGHT CONTROL RELAY (BRK)

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM NO. 1 RELAY BLOCK)

RECONFIRM DTC

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM NO. 1 RELAY BLOCK)

CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

DTC C1426 Stop Light Switch OFF Stuck Malfunction


DESCRIPTION

The skid control ECU (housed in the brake actuator assembly) inputs stop light switch signals and the condition of brake operation.
The skid control ECU has an open detection circuit, which outputs this DTC when detecting an open in the stop light input line or the ground line of the stop light circuit with the stop light switch off (brake pedal not depressed).

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 more 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. Stop light control relay
  5. Stop light control relay circuit
  6. Brake actuator assembly (Skid control ECU)

WIRING DIAGRAM

Refer to DTC C1380 (RAV4_ACA30 RM000001N3L01AX_02.html).

INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  2. When replacing the brake actuator assembly, perform zero point calibration (RAV4_ACA30 RM000001K1O00SX.html).
1.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
Go to step 4
OK


2.READ VALUE ON INTELLIGENT TESTER (STOP LIGHT SWITCH)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Select the Data List mode on the intelligent tester (RAV4_ACA30 RM000000ONK01EX.html).

    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 the specified point
    OFF: Brake pedal not depressed beyond the 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 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 turn ON.

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

    Result:

    Result
    		Proceed to
    OK
    		A
    NG
    		Turning on of the stop light switch is not confirmed.
    		B
    The brake pedal load sensing switch turns on first.
    		C


B
Go to step 9

C
Go to step 10
A


3.RECONFIRM DTC

  1. Turn the ignition switch off.

  1. Clear the DTCs (RAV4_ACA30 RM000000ONJ027X.html).

  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 (RAV4_ACA30 RM000000ONJ027X.html).

    Result:
    Result
    		Proceed to
    DTC (C1426) is not output.
    		A
    DTC (C1426) 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 (RAV4_ACA30 RM000000OS701UX.html).


B
REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200PX.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (RAV4_ACA30 RM00000135201PX.html)

4.INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System. Dtc C1426 Stop Light Switch Off Stuck Malfunction

  1. Make sure that there is no looseness in the locking part and connecting part of the connectors.

  1. Disconnect the stop light switch connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A66-2 - Body ground
    		Always
    		11 to 14 V


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


5.INSPECT STOP LIGHT SWITCH


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System. Dtc C1426 Stop Light Switch Off Stuck Malfunction

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    1 - 2
    		Switch pin not pushed in
    		Below 1 Ω
    Switch pin pushed in
    		10 kΩ or higher


NG
REPLACE STOP LIGHT SWITCH (RAV4_ACA30 RM000003P9J002X.html)
OK


6.INSPECT STOP LIGHT CONTROL RELAY (BRK)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System. Dtc C1426 Stop Light Switch Off Stuck Malfunction

  1. Remove the stop light control relay (BRK).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 4
    		Voltage is not applied between terminals 1 and 2
    		Below 1 Ω


NG
REPLACE STOP LIGHT CONTROL RELAY (BRK)
OK


7.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM NO. 1 RELAY BLOCK)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System. Dtc C1426 Stop Light Switch Off Stuck Malfunction

  1. Make sure that there is no looseness in the locking part and connecting part of the connectors.

  1. Disconnect the skid control ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A67-2 (STP) - Stop light control relay (BRK) terminal 3
    		Always
    		Below 1 Ω


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


8.RECONFIRM DTC

  1. Clear the DTCs (RAV4_ACA30 RM000000ONJ027X.html).

  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 (RAV4_ACA30 RM000000ONJ027X.html).

    HINT:
    Reinstall the relay, reconnect the connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.
    Result:
    Result
    		Proceed to
    DTC is not output.
    		A
    DTC 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 (RAV4_ACA30 RM000000OS701UX.html).


B
REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200PX.html)
A

INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT) (RAV4_ACA30 RM000001OCJ00QX.html)

9.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM NO. 1 RELAY BLOCK)


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Brake Control.Anti-Lock Brake System. Dtc C1426 Stop Light Switch Off Stuck Malfunction

  1. Turn the ignition switch off.

  1. Remove the stop light control relay (BRK).

  1. Make sure that there is no looseness in the locking part and connecting part of the connectors.

  1. Disconnect the skid control ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A67-2 (STP) - Stop light control relay (BRK) terminal 3
    		Always
    		Below 1 Ω
    HINT:
    If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (RAV4_ACA30 RM000000OS701UX.html).


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

REPLACE BRAKE ACTUATOR ASSEMBLY (RAV4_ACA30 RM000001XV200PX.html)

10.CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION

  1. Turn the ignition switch off.

  1. Check the brake pedal height and stop light switch installation (RAV4_ACA30 RM000001HJ300JX.html).

    OK:
    The brake pedal height and stop light switch installation are normal.
    HINT:
    If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (RAV4_ACA30 RM000000OS701UX.html).


NG
ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH (RAV4_ACA30 RM000001HJ300JX.html)
OK

REPLACE BRAKE PEDAL SUPPORT ASSEMBLY (BRAKE PEDAL LOAD SENSING SWITCH) (RAV4_ACA30 RM000001HJ600FX.html)