DTC    C1425    Open in Stop Light Switch Circuit

for Preparation Click here


DESCRIPTION

The skid control ECU detects the brake operating conditions through a signal transmitted by the stop light switch.
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).
On vehicles equipped with the Stop and Start System, DTC may be output if there is a significant difference between IG power source voltage and backup boost converter power source voltage when the stop and start system is cranking the engine during restarting.

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 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


C212077E01


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the brake actuator assembly, perform zero point calibration (Click here).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

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

    ABS/VSC/TRC (Skid Control ECU) 
    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 intelligent tester changes according to brake pedal operation.

    OK:
    The intelligent tester displays ON or OFF according to brake pedal operation.



NG
Go to step 3
OK


2.RECONFIRM DTC

  1. Turn the ignition switch off.

  1. Clear the DTCs (Click here).

  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 (Click here).
    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 (Click here).



B
REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (Click here)  

3.INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL)


    C197463E01

  1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Stop Light Switch)

  1. Disconnect the A27 stop light switch connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A27-2 - Body ground
    		Always
    		11 to 14 V



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


Go to step 5

4.INSPECT STOP LIGHT SWITCH


    A115657E17

  1. Measure the resistance according to the value(s) in the table below.
    Text in Illustration 
    *1
    		Component without harness connected
    (Stop Light Switch)

    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 (Click here)
OK


5.CHECK HARNESS AND CONNECTOR (STP TERMINAL)


    E175972E16

  1. Turn the ignition switch off.
    Text in Illustration 
    *A
    		for LHD
    *B
    		for RHD
    *1
    		Front view of wire harness connector
    (to Skid Control ECU)

  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:
    for LHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    A16-2 (STP) - Body ground
    		Stop light switch ON
    (Brake pedal depressed)
    		8 to 14 V
    A16-2 (STP) - Body ground
    		Stop light switch OFF
    (Brake pedal released)
    		Below 1.5 V
    for RHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    A17-2 (STP) - Body ground
    		Stop light switch ON
    (Brake pedal depressed)
    		8 to 14 V
    A17-2 (STP) - Body ground
    		Stop light switch OFF
    (Brake pedal released)
    		Below 1.5 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)