OPERATION
Each side impact airbag control module (SIACM)
serves as the impact sensor for its seat mounted air-
bag. The right side SIACM controls the right seat
airbag. The left side SIACM controls the left seat air-
bag. Each SIACM contains two accelerometers, both
accelerometers must agree in order to deploy the side
airbag. In the event of a side impact, the appropriate
SIACM will send a electronic signal to its airbag,
deploying the airbag. The SIACM communicates with
the Airbag Control Module (ACM) via the PCI bus
circuit.
The SIACM perform self-diagnostics and circuit
tests to determine if the system is functioning prop-
erly. If the test finds a problem, the SIACM will set
both active and stored Diagnostic Trouble Codes
(DTC’s). If a DTC is active, the SIACM will request
that the airbag warning lamp be turned on. The
results of the system test are transmitted on the PCI
bus circuit to the ACM once each second, or on a
change in lamp state (ON/OFF). If the warning lamp
status message from either SIACM contains a lamp
ON request, the ACM will set an active DTC. At the
same time as the DTC is set, the ACM sends a PCI
bus message to the cluster requesting the airbag
warning lamp to be turned ON. Observe all ACM
WARNING and CAUTION statements when servic-
ing or handling the SIACM. The SIACM’s are not
serviceable and must be replaced even if they are
dropped.
REMOVAL
The removal and installation of the driver and pas-
senger side modules is identical. The orientation of
the modules is the only difference.
WARNING: THE MODULES CANNOT BE INTER-
CHANGED. THEY ARE UNIQUE TO EACH SIDE.
FAILURE TO INSTALL THEM PROPERLY COULD
RESULT IN OCCUPANT PERSONAL INJURY OR
DEATH.
(1) Open hood.
(2) Disconnect and isolate the battery negative
cable (Fig. 20).
(3) Wait two minutes for the system reserve capac-
itor to discharge before servicing any airbag compo-
nents.
(4) Remove the door sill trim from the appropriate
side of the vehicle (Refer to 23 - BODY/INTERIOR/
DOOR SILL TRIM - REMOVAL).
(5) Peel back carpet to gain access to the retaining
screws.
(6) Remove the SIACM retaining screws (Fig. 24).
(7) Disconnect
the
SIACM
electrical
connector
(Fig. 24).
(8) Remove the SIACM from the vehicle.
INSTALLATION
The removal and installation of the driver and pas-
senger side modules is identical. The orientation of
the modules is the only difference.
WARNING: THE MODULES CANNOT BE INTER-
CHANGED. THEY ARE UNIQUE TO EACH SIDE.
FAILURE TO INSTALL THEM PROPERLY COULD
RESULT IN OCCUPANT PERSONAL INJURY OR
DEATH.
(1) Connect the SIACM electrical connector (Fig.
24).
(2) Position the SIACM below the front door sill
and install the retaining screws (Fig. 24). Torque the
nuts to 15 N·m (135 in. lbs.).
(3) Install the door sill trim on the appropriate
side of the vehicle (Refer to 23 - BODY/INTERIOR/
DOOR SILL TRIM - INSTALLATION).
WARNING: DO NOT CONNECT THE BATTERY NEG-
ATIVE
CABLE.
REFER
TO
ELECTRICAL,
RESTRAINTS, DIAGNOSIS AND TESTING - AIRBAG
SYSTEM
FIRST.
FAILURE
TO
DO
SO
COULD
RESULT IN OCCUPANT PERSONAL INJURY OR
DEATH.
(4) Close hood.
(5) Verify vehicle and system operation.
8O - 20
RESTRAINTS
PL/SRT-4
SIDE IMPACT AIRBAG CONTROL MODULE (Continued)