Dtc C1249/49 Open In Stop Light Switch Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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 brake actuator assembly) receives 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 switch signal input line or the ground line of the stop light switch circuit with the stop light switch off (brake pedal not depressed).

DTC Code
DTC Detection Condition
Trouble Area
C1249/49
The IG1 terminal voltage is 9.5 V or more and an open circuit in the stop light switch circuit continues for 0.3 seconds or more.
  1. STOP fuse
  2. Stop light switch
  3. Stop light switch circuit
  4. Skid control ECU (Brake actuator assembly)

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control System. Dtc C1249/49 Open In Stop Light Switch Circuit


INSPECTION PROCEDURE

NOTICE:
  1. When replacing the brake actuator assembly, perform zero point calibration (Toyota Fortuner RM000000XHR02TX.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK STOP LIGHT OPERATION

  1. Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released.

    OK:

    Condition
    		Illumination Condition
    Brake pedal depressed
    		ON
    Brake pedal released
    		OFF


NG
Go to step 6
OK


2.INSPECT SKID CONTROL ECU (STP TERMINAL)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control 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
    S25-2 (STP) - Body ground
    		Stop light switch ON (Brake pedal depressed)
    		8 to 14 V
    S25-2 (STP) - Body ground
    		Stop light switch OFF (Brake pedal released)
    		Below 1.5 V


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


3.INSPECT SKID CONTROL ECU (IG1 TERMINAL)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control 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
    S25-34 (IG1) - Body ground
    		Ignition switch ON
    		11 to 14 V


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


4.INSPECT SKID CONTROL ECU (GND1 TERMINAL)
Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control 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
    S25-1 (GND1) - Body ground
    		Always
    		Below 1 Ω


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


5.RECONFIRM DTC

  1. Clear the DTC(s) (Toyota Fortuner RM000000XHV09NX.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 (Toyota Fortuner RM000000XHV09NX.html).

    Result
    Result
    		Proceed to
    DTC not output
    		A
    DTC 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 (Toyota Fortuner RM000000XHN092X.html).


B
REPLACE BRAKE ACTUATOR ASSEMBLY
A

USE SIMULATION METHOD TO CHECK

6.INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control 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
    S14-2 - Body ground
    		Always
    		11 to 14 V


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


7.INSPECT STOP LIGHT SWITCH

  1. Remove the stop light switch.



    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control 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
OK


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

  1. Disconnect the stop light switch connector.



    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control 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
    S25-2 (STP) - S14-1
    		Always
    		Below 1 Ω
    S25-2 (STP) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.RECONFIRM DTC

  1. Clear the DTC(s) (Toyota Fortuner RM000000XHV09NX.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 (Toyota Fortuner RM000000XHV09NX.html).

    Result
    Result
    		Proceed to
    DTC not output
    		A
    DTC 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 (Toyota Fortuner RM000000XHN092X.html).


B
REPLACE BRAKE ACTUATOR ASSEMBLY
A

INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT)