B1901 Open in front pretensioner squib RH circuit. The right seat belt pretensioner loop is open

What does B1901 mean on a Toyota?

B1901. Open in front pretensioner squib RH circuit. The right seat belt pretensioner loop is open. This Toyota-enhanced code applies to Corolla, Camry, RAV4, Tacoma, Yaris, 2003 to 2013.

Common causes of B1901

• Loose right pretensioner connector
• Damaged harness under right seat
• Failed right pretensioner unit
• Corroded squib pins
• Seat removed without battery disconnect

How to fix B1901

1. Disconnect battery and wait before testing
2. Inspect right buckle and retractor wiring
3. Reseat pretensioner connector fully
4. Check continuity of floor harness
5. Replace right pretensioner if loop is open