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 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
C1249/49
When IG1 terminal voltage is 9.5 V or more, 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


C181566E01


C183918E06


INSPECTION PROCEDURE

1.INSPECT STOP FUSE


    C156482E02

  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


2.CHECK STOP LIGHT OPERATION

  1. Install the STOP fuse.

  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 7
OK


3.INSPECT SKID CONTROL ECU (STP TERMINAL)


    C156384E73

  1. Disconnect the skid control ECU connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A51-28 (STP) - Body ground
    		Stop light switch ON (Brake pedal depressed)
    		8 to 14 V
    A51-28 (STP) - Body ground
    		Stop light switch OFF (Brake pedal released)
    		Below 1.5 V


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


4.INSPECT SKID CONTROL ECU (IG1 TERMINAL)


    C156384E72

  1. Turn the ignition switch to ON.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A51-34 (IG1) - Body ground
    		Ignition switch ON
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)
OK


5.INSPECT SKID CONTROL ECU (GND1 TERMINAL)


    C156384E71

  1. Turn the ignition switch off.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A51-1 (GND1) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)
OK


6.RECONFIRM DTC

  1. Reconnect the skid control ECU connector.

  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 (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 BRAKE ACTUATOR ASSEMBLY (Click here)
A

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

7.INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL)


    C173882E04

  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


8.INSPECT STOP LIGHT SWITCH


    C146625E03

  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 (Click here)
OK


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


    C156781E08

  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
    A51-28 (STP) - A1-1
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


10.RECONFIRM DTC

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

  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 (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 BRAKE ACTUATOR ASSEMBLY (Click here)
A

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