Dtc C1425 Open In Stop Light Switch Circuit

Brake. Yaris. Ncp93, 131
Brake Control Dynamic Control Systems. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STOP LIGHT OPERATION

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

RECONFIRM DTC

CHECK HARNESS AND CONNECTOR (STP TERMINAL)

DTC C1425 Open in Stop Light Switch Circuit


DESCRIPTION

The skid control ECU (housed in the actuator assembly) inputs the stop light switch signal 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 NO.
DTC Detection Condition
Trouble Area
C1425
When IG1 terminal voltage is 9.5 V or more, an open circuit (A-B, A-ground) of the stop light switch continues for 3 seconds or more.
  1. Harness or connector
  2. Brake actuator assembly (skid control ECU)

WIRING DIAGRAM


Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan). Dtc C1425 Open In Stop Light Switch Circuit


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
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
INSPECT STOP LIGHT CIRCUIT (YARIS_NCP93 RM000003VC2007X.html)
OK


2.READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

  1. Turn the ignition switch off.

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

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

  1. According to the display on the Techstream, read the Data List.

    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
    		-

  1. 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
Go to step 4
OK


3.RECONFIRM DTC

  1. Turn the ignition switch off.

  1. Clear the DTCs (YARIS_NCP93 RM000000XHV0BPX.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 recorded (YARIS_NCP93 RM000000XHV0BPX.html).

    Result
    Result
    		Proceed to
    DTC (C1425) is not output
    		A
    DTC (C1425) 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 (YARIS_NCP93 RM000000XHN0AWX.html).


B
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02FX.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (YARIS_NCP93 RM000000UZ309WX.html)

4.CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    Yaris. Ncp93, 131.Brake Control Dynamic Control Systems.Anti-Lock Brake System (For Sedan). Dtc C1425 Open In Stop Light Switch Circuit

  1. Turn the ignition switch off.

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

  1. Disconnect the A15 brake actuator assembly (skid control ECU) connector.

  1. Check the connector case and terminals for deformation and corrosion.

    OK:
    No deformation or corrosion.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A15-28 (STP) - Body ground
    		Stop light switch ON
    (Brake pedal depressed)
    		8 to 14 V
    A15-28 (STP) - Body ground
    		Stop light switch OFF
    (Brake pedal released)
    		Below 1.5 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Brake Actuator Assembly (Skid Control ECU))

  1. Reconnect the A15 brake actuator assembly (skid control ECU) connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02FX.html)