B1903 LEXUS, SCION, TOYOTA: SHORT TO POSITIVE IN FRONT DRIVER SIDE PRETENSIONER SQUIB CIRCUIT
POST UPDATED IN May, 2023
B1903 LEXUS, SCION, TOYOTA: SHORT TO POSITIVE IN FRONT DRIVER SIDE PRETENSIONER SQUIB CIRCUIT
The circuit that activates the front pretensioner on the driver’s side includes the center airbag sensor and the outside left belt corresponding to the front seat (LH). The function of this ignition circuit is to command the SRS (Supplemental Restraint System) to initiate deployment once the conditions for deployment are met.
In case the driver’s side front pretensioner activation circuit does not work properly, specifically a positive short circuit, the DTC B1903 OBDII code will be set for Lexus, Scion, Toyota vehicles.
Reasons for setting the B1903 OBD2 fault code B1903:
To troubleshoot the B1903 OBD2 diagnostic code, please note this: