B1908 - FAULT CODE - OBD2

B1908 Code failures by brands

B1908 TOYOTA, SCION, LEXUS: SHORT TO POSITIVE IN FRONT PASSENGER SIDE PRETENSIONER SQUIB CIRCUIT

Description of DTC code B1908

The passenger-side front pretensioner ignition circuit includes the center airbag sensor assembly (airbag sensor) and the right front seat outboard belt (RH). This circuit tells the SRS (Supplemental Restraint System) when it is required to deploy, taking into account the necessary conditions.

If the B1908 OBD2 fault code is stored on Toyota, Scion, or Lexus vehicles, it is because a fault was detected in the front passenger side pretensioner ignition circuit due to a short to positive.

Symptoms of fault code B1908

Check Engine lamp ON.
Airbag light ON.

Causes of OBD2 B1908

The B1908 OBDII diagnostic code is set for the following reasons:

Right front seat (RH) outboard belt circuit wires or connectors may be in poor condition.
The right front seat outboard belt circuit (RH) may be shorted due to poor connections.
The right front seat (RH) outboard seat belt (front passenger side pretensioner squib) may be faulty.
Possibly the center airbag sensor assembly is faulty.

Possible solutions of the DTC code B1908

Steps to follow to troubleshoot the DTC B1908 OBD2 :

Consult the Technical Service Bulletins to start the diagnosis,
Check the condition of the right front seat (RH) outboard belt circuit wiring and connectors. Look for common corrosion and wear damage. If such conditions are found, make repairs.
Verify that the electrical connections of the right front seat (RH) outboard belt circuit are not faulty enough to cause a short circuit. Also, compare the actual voltages with the specified voltages. If you find some differences, make the appropriate repairs.
Check for damage to the right front seat outboard belt (RH) and the center airbag sensor If after these checks you discover some damage, make adjustments.