AMSAFE SEATBELT AIRBAG SYSTEM
INSTALLATION, HANDLING AND SHIPPING INSTRUCTIONS E510629
SYSTEM DESCRIPTION AND OPERATION
02-Aug-2013
Page 4
B. Inflatable Lap Belt or Restraint Assembly
(1) The Inflatable Lap Belt or Restraint Assembly consists of two primary subassemblies; the
Airbag Belt and the Buckle Belt. The subassemblies are of the same basic configuration as
conventional non-inflatable seatbelts. Figures 1 through 4 identify the primary components of
the AmSafe Seatbelt Airbag System.
(2) The airbag belt utilizes a similar tongue or coupling as conventional seatbelts. It may have an
attached enabling switch. The buckle side belt uses a lift-latch or end-release buckle. It may
include a magnet that closes an enabling switch upon buckling the belt halves together. The
enabling switch provides circuit continuity when the two seatbelt halves are connected allowing
the EMA to make the system active.
Enabling Switch System: All AmSafe Airbag Systems with lift-latch buckles have enabling
switches. If an end-release buckle has a cable that connects to the Cable Interface Assembly,
it has an enabling switch. If the two seatbelt halves are not coupled, circuit continuity is not
established by the enabling switch and the EMA disables or safes the system.
Non-Enabling Switch System: If the end-release buckle does not have a cable that connects
with the Cable Interface Assembly, then it does not have an enabling switch. The system is
active as soon as all electrical connections are made.
(3) The airbag belt consists of the airbag unit itself attached to an otherwise conventional seatbelt,
gas delivery hose, and electrical connector if an enabling switch is used (for lift-latch buckles).
The airbag, gas hose, and seatbelt webbing are all contained within a cover which has a tear
seam designed to open allowing the deployment of the airbag when gas pressure is applied.
(4) The gas hose connects to the Inflator via a threaded hose connector. Electrical connectors
attach the enabling switch circuitry to the Inflator’s squib (Figure 5) and Cable Interface
Assembly.
(5) The Inflatable Lap Belt or Restraint Assembly connects to the seat structure with the same
mounting provisions as a conventional seatbelt.
(6) The lift-latch tongue and buckle differ from the conventional assemblies such that is neither
interchangeable with non-airbag seat parts, nor is it possible to connect the tongue and buckle
180 degrees out of phase. These features preclude the situation where a conventional buckle
side assembly is accidentally combined with that of an AmSafe Seatbelt Airbag System.
C. Inflator and Inflator Fitting
(1) The Inflator mounts under the seat to a seat-specific bracket/clamp. One Inflator is required for
each passenger; two may be required for some seat installations, such as row-to row or dual
inflator systems. An Inflator Fitting may be required depending on the type of Inflator being
used; a 90, 45, or 0-degree type depending on installation requirement may be used to attach
the Inflatable Lap Belt Assembly hose, after the hose has been routed through the seat, to the
Inflator. Figures 5 and 6 identify the Inflator and if required Inflator Fittings.
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