B1800 - FAULT CODE - OBD2

POST UPDATED IN February, 2023

B1800 Code failures by brands

B1800 SCION, LEXUS, TOYOTA: SHORT IN DRIVER'S SIDE SQUIB CIRCUIT

Description of DTC code B1800

The driver-side squib circuit includes the Steering Pad, a coiled cable, and the Center Airbag Sensor assembly. The function of this circuit is to send signals to the Supplemental Restraint System (SRS). These signals are used to indicate when it needs to be deployed, as conditions warrant.

When the B1800 OBDII fault code is set on Scion, Lexus, and Toyota vehicles, it means that a short has been detected in the driver’s side squib circuit.

Symptoms of fault code B1800

Causes of OBD2 B1800

The reasons why the B1800 OBD2 diagnostic code is set are:

  • The coiled cable or instrument panel wiring may be faulty.
  • The driver's side squib (Steering Pad) may be in poor condition.
  • Possibly the Center Airbag Sensor assembly is defective.

Possible solutions of the DTC code B1800

The steps to follow to correct the DTC B1800 OBDII code are:

  • To start the diagnosis consult the TSBs.
  • Inspect all the wiring related to the instrument panel along with the spiral cable. Check that all are in good condition. Repair if you detect common damage.
  • Using the appropriate tools, perform electrical checks on the driver-side squib circuit. Check that all connections meet the requirements for proper operation. Make any necessary corrections.
  • Check that the Central Airbag Sensor is in good condition. Follow the manufacturer's recommendations to carry out such diagnosis and if obvious deficiencies are detected, make the appropriate adjustments.

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