Dtc C1249/49 Open In Stop Light Switch Circuit

Brake. Corolla. Zre142 Aze141
Brake Control Dynamic Control Systems. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT STOP FUSE

CHECK STOP LIGHT OPERATION

INSPECT SKID CONTROL ECU (STP TERMINAL)

INSPECT SKID CONTROL ECU (IG1 TERMINAL)

INSPECT SKID CONTROL ECU (GND1 TERMINAL)

RECONFIRM DTC

INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL)

INSPECT STOP LIGHT SWITCH

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

RECONFIRM DTC

DTC C1249/49 Open in Stop Light Switch Circuit


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


Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1249/49 Open In Stop Light Switch Circuit


Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1249/49 Open In Stop Light Switch Circuit


INSPECTION PROCEDURE

1.INSPECT STOP FUSE


    Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1249/49 Open In Stop Light Switch Circuit

  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)


    Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1249/49 Open In Stop Light Switch Circuit

  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)


    Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1249/49 Open In Stop Light Switch Circuit

  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)


    Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1249/49 Open In Stop Light Switch Circuit

  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 (COROLLA_ZRE142 RM000000XHV0F3X.html).

  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 (COROLLA_ZRE142 RM000000XHV0F3X.html).

    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 (COROLLA_ZRE142 RM000000XHN0DVX.html).


B
REPLACE BRAKE ACTUATOR ASSEMBLY (COROLLA_ZRE142 RM0000013P6022X.html)
A

CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) (COROLLA_ZRE142 RM000000XHP0ELX.html)

7.INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL)


    Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1249/49 Open In Stop Light Switch Circuit

  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


    Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1249/49 Open In Stop Light Switch Circuit

  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 (COROLLA_ZRE142 RM000002VPP018X.html)
OK


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


    Corolla. Zre142 Aze141.Brake Control Dynamic Control Systems.Anti-Lock Brake System. Dtc C1249/49 Open In Stop Light Switch Circuit

  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 (COROLLA_ZRE142 RM000000XHV0F3X.html).

  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 (COROLLA_ZRE142 RM000000XHV0F3X.html).

    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 (COROLLA_ZRE142 RM000000XHN0DVX.html).


B
REPLACE BRAKE ACTUATOR ASSEMBLY (COROLLA_ZRE142 RM0000013P6022X.html)
A

INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT) (COROLLA_ZRE142 RM000002CE20DLX.html)