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 SWITCH OPERATION

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

RECONFIRM DTC

CHECK TERMINAL VOLTAGE (STP TERMINAL)

DTC C1425 Open in Stop Light Switch Circuit


DESCRIPTION

The skid control ECU (brake actuator assembly) detects the brake operating conditions through a signal transmitted by the stop light switch.
The skid control ECU (brake actuator assembly) 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 between 9.5 and 17.4 V, an open stop light switch circuit (A to B, A to body ground) continues for 3 seconds or more.
  1. Stop light switch circuit
  2. Skid control ECU (Brake actuator assembly)

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:
  1. When replacing the brake actuator assembly, perform zero point calibration (YARIS_NCP93 RM000000XHR078X.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK STOP LIGHT SWITCH 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
CHECK STOP LIGHT CIRCUIT (YARIS_NCP93 RM000002CE208CX.html)
OK


2.READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

  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 / OFF or ON
    		OFF: Brake pedal released
    ON: Brake pedal depressed
    		-

  1. Check that the stop light condition 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 RM000000XHV0CQX.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 RM000000XHV0CQX.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 RM000000XHN0BRX.html).


B
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02KX.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (YARIS_NCP93 RM000000XHS0ANX.html)

4.CHECK TERMINAL VOLTAGE (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 skid control ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A70-2 (STP) - Body ground
    		Stop light switch ON
    (Brake pedal depressed)
    		8 to 14 V
    Stop light switch OFF
    (Brake pedal released)
    		Below 1.5 V
Text in Illustration
*a
Front view of wire harness connector
(to Skid control ECU)

  1. Reconnect the skid control ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - STOP LIGHT CIRCUIT)
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02KX.html)