Dtc C1425 Open In Stop Light Switch Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STOP LIGHT OPERATION

CHECK TERMINAL VOLTAGE (STP TERMINAL)

RECONFIRM DTC

DTC C1425 Open in Stop Light Switch Circuit


DESCRIPTION

The skid control ECU (brake actuator assembly) has an open detection circuit, which stores 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
C1425
When the IG1 terminal voltage is between 9.5 and 17.4 V, an open in the stop light switch circuit continues for 0.3 seconds or more.
  1. Stop light LH and RH circuit
  2. STP terminal circuit
  3. Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control System. Dtc C1425 Open In Stop Light Switch Circuit


INSPECTION PROCEDURE

NOTICE:
  1. After replacing the brake actuator assembly, perform calibration (Toyota Fortuner RM000000XHR06WX.html).
  2. Before disconnecting the connector, make sure that there are no problems with the connection.
  3. 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 LIGHTING SYSTEM (PROBLEM SYMPTOMS TABLE) (Toyota Fortuner RM000002CE208UX.html)
OK


2.CHECK TERMINAL VOLTAGE (STP TERMINAL)

  1. Turn the ignition switch off.

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



    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control System. Dtc C1425 Open In Stop Light Switch Circuit

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    S25-2 (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


3.RECONFIRM DTC

  1. Clear the DTC (Toyota Fortuner RM000000XHV0C7X.html).

  1. Turn the ignition switch off.

  1. Start the engine.

  1. Depress the brake pedal.

  1. Check if the same DTC is output (Toyota Fortuner RM000000XHV0C7X.html).

    Result
    Result
    		Proceed to
    DTC is not output
    		A
    DTC 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 suspected area (Toyota Fortuner RM000000XHN0BDX.html).


B
REPLACE BRAKE ACTUATOR ASSEMBLY (Toyota Fortuner RM0000010K0010X.html)
A

USE SIMULATION METHOD TO CHECK (Toyota Fortuner RM0000012Q9013X.html)