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DTC    C1249/49    Open in Stop Light Switch Circuit

for Preparation Click here


DESCRIPTION

The skid control ECU inputs the stop light switch signal and detects the brake pedal operation status.
The skid control ECU has an open detection circuit, which outputs this DTC if it detects an open in the stop light input line or ground line of the stop light circuit with the stop light switch off (brake pedal not depressed).

DTC Code
INF Code
DTC Detection Condition
Trouble Area
C1249/49
231
When IG1 terminal voltage is 9.5 V or more, an open stop light switch circuit continues for 10 seconds or more.
  1. Wire harness or connector
  2. Stop light switch
  3. Brake booster with master cylinder (Skid control ECU)

WIRING DIAGRAM


C250217E02


INSPECTION PROCEDURE

NOTICE:
When replacing the brake booster with master cylinder (skid control ECU), perform initialization and calibration of the linear solenoid valve (Click here).

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 INTELLIGENT TESTER (STOP LIGHT SWITCH)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Select the Data List on the intelligent tester (Click here).

    ABS/VSC/TRC 
    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 7
OK


3.RECONFIRM DTC

  1. Turn the power switch off.

  1. Clear the DTCs (Click here).

  1. Turn the power switch on (READY).

  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 (C1249/49) is not output
    		A
    DTC (C1249/49) is output (for LHD)
    		B
    DTC (C1249/49) is output (for RHD)
    		C

    HINT:
    If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)
A

CHECK FOR INTERMITTENT PROBLEMS (Click here)  

4.INSPECT STOP LIGHT SWITCH

  1. Check the stop light switch (Click here).

    OK:
    The stop light switch is normal.



NG
REPLACE STOP LIGHT SWITCH (Click here)
OK


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


    C209401E91

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A58-33 (STP) - Body ground
    		Stop light switch ON
    (Brake pedal depressed)
    		11 to 14 V
    A58-33 (STP) - Body ground
    		Stop light switch OFF
    (Brake pedal released)
    		Below 1.5 V

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Skid Control ECU)



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.RECONFIRM DTC

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

  1. Clear the DTCs (Click here).

  1. Turn the power switch on (READY).

  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 (C1249/49) is not output
    		A
    DTC (C1249/49) is output (for LHD)
    		B
    DTC (C1249/49) is output (for RHD)
    		C

    HINT:
    If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)
A

INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT) (Click here)  

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

  1. Turn the power 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
    A58-33 (STP) - A67-2 (L)
    		Always
    		Below 1 Ω


    Result:

    Result
    		Proceed to
    OK (for LHD)
    		A
    OK (for RHD)
    		B
    NG
    		C

    HINT:
    If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (Click here).



B
REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)

C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER (Click here)