After diagnosing or repairing any air bag system issue, complete the checklist: ensure all restraint system diagnostic tools are removed, the driver air bag connector at the base of the steering column is connected, all in-seat harness connectors are connected, all air bag modules are connected, safety belt pretensioner connectors are connected, the Restraints Control Module (RCM) is connected, all sensors (front and side impact, seat position, and occupant classification [if equipped]) are connected, and the battery is connected.