C1249 - FAULT CODE - OBD2

POST UPDATED IN February, 2023

C1249 Code failures by brands

C1249 LEXUS, TOYOTA, SCION: OPEN IN STOP LIGHT SWITCH CIRCUIT

Description of DTC code C1249

The Slip Control Unit detects the various brake working situations using the signal provided by the brake light switch. The Slip Control Unit has an open circuit detection circuit.

The OBD2 fault code C1249 is set when the brake light input line has an open circuit while the switch is off.

Symptoms of fault code C1249

  • Check Engine Lamp ON.
  • ABS (Anti-Lock Brake System) warning light ON.

Causes of OBD2 C1249

Reasons for setting the DTC C1249 OBDII code:

  • The wiring in the Brake Light Switch circuit may be damaged.
  • The Brake Light Switch circuit connections may be in poor condition.
  • The brake light switch may be damaged.
  • The ABS and Traction Actuator may be faulty.

Possible solutions of the DTC code C1249

To solve the C1249 OBD2 diagnostic code, try this:

  • Use an automotive scanner to check if additional codes to C1249 are set. If so, the diagnosis of these codes should follow the order shown.
  • Check the wiring and connectors related to the Brake Light Switch circuit. Check these components for common deficiencies due to burns or wear. Fix if necessary.
  • Check that the voltages in the Brake Light Switch circuit match those specified by the manufacturer. If you discover voltages different from those allowed, make the appropriate corrections.
  • Follow the diagnostic steps and check the Brake Light Switch for damage. If you determine that the switch is inconsistent, replace it.

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