Dtc C1425 Open In Stop Light Switch Circuit

Brake. Corolla. Zre142 Aze141
Brake Control Dynamic Control Systems. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STOP LIGHT OPERATION

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

RECONFIRM DTC

INSPECT STOP FUSE

INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL)

INSPECT STOP LIGHT SWITCH

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT SWITCH)

RECONFIRM DTC

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT SWITCH)

DTC C1425 Open in Stop Light Switch Circuit


DESCRIPTION

The skid control ECU (housed in the 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
C1425
When IG1 terminal voltage is between 9.5 and 17.4 V, an open stop light switch circuit continues for 0.3 seconds or more.
  1. STOP fuse
  2. Stop light switch
  3. Stop light switch circuit
  4. Brake actuator assembly (Skid control ECU)

WIRING DIAGRAM


Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1425 Open In Stop Light Switch Circuit


Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1425 Open In Stop Light Switch Circuit


Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1425 Open In Stop Light Switch Circuit


INSPECTION PROCEDURE

NOTICE:
When replacing the brake actuator assembly, perform zero point calibration (COROLLA_ZRE142 RM000000XHR08KX.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 USING TECHSTREAM (STOP LIGHT SWITCH)

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Select the Data List on the Techstream (COROLLA_ZRE142 RM000000XHW0BYX.html).

    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 9
OK


3.RECONFIRM DTC

  1. Turn the ignition switch off.

  1. Clear the DTCs (COROLLA_ZRE142 RM000000XHV0F2X.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 (COROLLA_ZRE142 RM000000XHV0F2X.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 Problem Symptoms Table, refer back to the table and proceed to the next step (COROLLA_ZRE142 RM000000XHN0DUX.html).


B
REPLACE BRAKE ACTUATOR ASSEMBLY (COROLLA_ZRE142 RM000003CZU00MX.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (COROLLA_ZRE142 RM000000XHP0EKX.html)

4.INSPECT STOP FUSE


    Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1425 Open In Stop Light Switch Circuit

  1. Remove the STOP fuse from the main body ECU (instrument panel junction block).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    STOP (10 A) fuse
    		Always
    		Below 1 Ω


NG
REPLACE STOP FUSE
OK


5.INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL)


    Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1425 Open In Stop Light Switch Circuit

  1. Install the STOP fuse.

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

  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
    A1-2 - Body ground
    		Always
    		11 to 14 V


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


6.INSPECT STOP LIGHT SWITCH


    Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1425 Open In Stop Light Switch Circuit

  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 free
    		Below 1 Ω
    1 - 2
    		Switch pin pushed in
    		10 kΩ or higher


NG
REPLACE STOP LIGHT SWITCH (COROLLA_ZRE142 RM000002VPP018X.html)
OK


7.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT SWITCH)


    Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1425 Open In Stop Light Switch Circuit

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

  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
    A66-2 (STP) - A1-1
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.RECONFIRM DTC

  1. Reconnect the skid control ECU connector and the stop light switch connector.

  1. Clear the DTCs (COROLLA_ZRE142 RM000000XHV0F2X.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 (COROLLA_ZRE142 RM000000XHV0F2X.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 Problem Symptoms Table, refer back to the table and proceed to the next step (COROLLA_ZRE142 RM000000XHN0DUX.html).


B
REPLACE BRAKE ACTUATOR ASSEMBLY (COROLLA_ZRE142 RM000003CZU00MX.html)
A

INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT) (COROLLA_ZRE142 RM000002CE20DLX.html)

9.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT SWITCH)


    Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. 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 and the stop light switch connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A66-2 (STP) - A1-1
    		Always
    		Below 1 Ω
    HINT:
    If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (COROLLA_ZRE142 RM000000XHN0DUX.html).


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (COROLLA_ZRE142 RM000003CZU00MX.html)