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 braking condition.
The skid control ECU has a circuit for open detection inside. The skid control ECU outputs the DTC if it detects an open in the stop light signal input line when the stop light switch is off or an open in the stop light circuit (skid control ECU side).

DTC No.
INF Code
DTC Detection Condition
Trouble Area
C1249/49
520
Stop light switch circuit is open for at least 10 seconds when IG1 terminal voltage is 9.5 V or more.
  1. Stop light switch
  2. Stop light switch circuit
  3. Rear combination light (Stop light) assembly

WIRING DIAGRAM


C109391E01


INSPECTION PROCEDURE

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

1.INSPECT FUSE (STOP SW FUSE)

  1. Remove the STOP SW fuse from the cowl side J/B RH.

  1. Check the STOP SW fuse.

    Resistance:
    Below 1 Ω (Continuity)



NG
REPLACE FUSE (STOP SW FUSE)
OK


2.READ VALUE OF INTELLIGENT TESTER (STOP LIGHT SWITCH)

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine.

  1. Select the DATA LIST mode on the intelligent tester.

    ABS / VSC / TR(A)C: 
    Item (Display)
    		Measurement Item /
    Range (Display)
    		Normal Condition
    Stop Lamp SW
    		Stop light switch / ON or OFF
    		ON: Brake pedal depressed
    OFF: Brake pedal released

  1. Check that the stop light observed on the intelligent tester changes when the brake pedal is depressed.

    OK:
    When the brake pedal is depressed, the intelligent tester displays "ON".



NG
Go to step 8
OK


3.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO STOP LIGHT SWITCH)


    C110683E03

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

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

    Resistance:
    Tester Connection
    		Specified Condition
    A13-45 (STP) - A37-1
    		Below 1 Ω

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

    Resistance:
    Tester Connection
    		Specified Condition
    A13-45 (STP) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL)


    C110684E03

  1. Disconnect the stop light switch connector.

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

    Voltage:
    Tester Connection
    		Specified Condition
    A37-2 - Body ground
    		10 to 14 V



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


5.INSPECT STOP LIGHT SWITCH


    C106567E02

  1. Disconnect the stop light switch connector.

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

    Resistance:
    Tester Connection
    		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
OK


6.INSPECT SKID CONTROL ECU (GND TERMINAL)


    C110724E07

  1. Disconnect the skid control ECU (A13, A15) connectors.

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

    Resistance:
    Tester Connection
    		Specified Condition
    A13-1 (GND) - Body ground
    		Below 1 Ω
    A15-1 (GND4) - Body ground
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK


7.RECONFIRM DTC

  1. Clear the DTC (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).

    HINT:
    Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.


    Result:

    Condition
    		Proceed To
    DTC (C1249/49) is not output
    		A
    DTC (C1249/49) 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 SKID CONTROL ECU
A

END 

8.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO LUGGAGE ROOM J/B ECU)


    C110735E02

  1. Disconnect the skid control ECU connector and luggage room J/B ECU connector.

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

    Resistance:
    Tester Connection
    		Specified Condition
    A13-45 (STP) - LC-32 (STPI)
    		Below 1 Ω
    A13-45 (STP) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

INSPECT LIGHTING SYSTEM