Diagnostic trouble code C1249 Land Cruiser

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STOP LIGHT OPERATION

INSPECT SKID CONTROL ECU (STP TERMINAL)

RECONFIRM DTC

DTC C1249/49 Open in Stop Light Switch Circuit

Description

The stop light switch signal is input to the skid control ECU and the skid control ECU detects the status of brake operation.

The skid control ECU has an open detection circuit.

If an open in the stop light switch input line or GND side stop light circuit is detected when the stop light switch is off, this DTC is stored.

DTC Code DTC Detection Condition Trouble Area
C1249/49 The ECU terminal IG1 voltage is 9.5 to 17.0 V, ABS is not operating, and an open in the stop light switch circuit continues for 3 seconds or more.
  1. Harness or connector
  2. Stop light control relay
  3. Master cylinder solenoid (Skid control ECU)

Wiring diagram

Diagnostic trouble code C1249 Land Cruiser. Wiring diagram

Inspection procedure

NOTICE:

When replacing the master cylinder solenoid, perform zero point calibration .

1.CHECK STOP LIGHT OPERATION

  1. Check that the stop light 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 LIGHTING SYSTEM (STOP LIGHT CIRCUIT)
 
OK  
   

2.INSPECT SKID CONTROL ECU (STP TERMINAL)

Diagnostic trouble code C1249 Land Cruiser. Disconnect the A24 skid control ECU connector.

  1. Disconnect the A24 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
    A24-7 (STP) - Body ground Stop light switch on (Brake pedal depressed) 8 to 14 V
    A24-7 (STP) - Body ground Stop light switch off (Brake pedal released) Below 1.5 V
    Result
    Result Proceed to
    OK (When troubleshooting in accordance with the Diagnostic Trouble Code Chart) A
    OK (When troubleshooting in accordance with the Problem Symptoms Table) B
    NG C
  B  
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
 
  C  
REPAIR OR REPLACE HARNESS OR CONNECTOR
 
A  
   

3.RECONFIRM DTC

  1. Clear the DTC .

  1. Check if the same DTC is output .

    HINT:

    Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

    Result
    Result Proceed to
    DTC is not output A
    DTC is output LHD B
    RHD C
  B  
REPLACE MASTER CYLINDER SOLENOID
 
  C  
REPLACE MASTER CYLINDER SOLENOID
 
A  
   
USE SIMULATION METHOD TO CHECK