Corrective Action
WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
Visually check wiring harness connections. Replace harness if damaged and recheck system. If fault still exists, replace seat belt pretensioner and recheck system. If fault still exists, replace diagnosis sensor unit and recheck system. If fault still exists, replace related harness. Go to FINAL CHECK under DIAGNOSTICS.