DTC    C1249/49    Open in Stop Light Switch Circuit

for Preparation Click here


DESCRIPTION

The skid control ECU (housed in the actuator assembly) inputs the stop light switch signal 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 while the stop light switch is OFF.

DTC No.
DTC Detecting Condition
Trouble Area
C1249/49
  1. When IG1 terminal voltage is 9.5 to 17.2 V, an open circuit of the stop light switch continues for 0.3 sec. or more.
  2. When the brake pedal load sensing switch is ON, the master cylinder pressure is 2 Mpa or more and the deceleration calculated from the vehicle speed is 0.2 G or more, the stop light switch is OFF for 2 sec. or more.
  1. Stop light switch
  2. Stop light switch circuit
  3. ABS and TRACTION actuator assembly

WIRING DIAGRAM


C109391E02


INSPECTION PROCEDURE

NOTICE:
When replacing the ABS and TRACTION actuator assembly, perform zero point calibration (Click here).

1.INSPECT FUSE (STOP SW FUSE)


    C106592E03

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

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

    Resistance:
    Tester Connection
    		Specified Condition
    STOP SW fuse
    		Below 1 Ω (Continuity)



NG
REPLACE FUSE (STOP SW FUSE)
OK


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

  1. Connect the intelligent tester to the DLC3.

  1. Start the engine.

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

    DATA LIST: 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 (STOP LIGHT SWITCH TO SKID CONTROL ECU)


    C110683E04

  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
    A48-27 (STP) - A37-1 (STP)
    		Below 1 Ω

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

    Resistance:
    Tester Connection
    		Specified Condition
    A48-27 (STP) - Body ground
    		10 kΩ or higher



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


4.INSPECT STOP LIGHT SWITCH (POWER SOURCE CIRCUIT)


    C110684E04

  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


    C106567E03

  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
    A37-1 - A37-2
    		Switch pin free
    		Below 1 Ω
    A37-1 - A37-2
    		Switch pin pushed in
    		10 kΩ or higher



NG
REPLACE STOP LIGHT SWITCH
OK


6.INSPECT SKID CONTROL ECU (GND TERMINAL)


    F049362E16

  1. Disconnect the skid control ECU connector.

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

    Resistance:
    Tester Connection
    		Specified Condition
    A48-32 (GND1) - Body ground
    		Below 1 Ω
    A48-1 (GND2) - Body ground
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRUICT)
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 that 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 ABS AND TRACTION ACTUATOR ASSEMBLY
A

END 

8.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU TO LUGGAGE ROOM JUNCTION BLOCK ECU)


    C110864E03

  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
    A48-27 (STP) - LC-32 (STPI)
    		Below 1 Ω
    LC-32 (STPI) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

INSPECT LIGHTING SYSTEM