(9) Reinstall the gra b h andle on to the h eadliner.
(Refer to 23 - BODY/INTERIOR/ASSIST HANDLE -
INSTALLATION).
(10) Rein st all th e tr im on to the inside of th e B-pil-
lar. (Refer t o 23 - BODY/INTERIOR/B-P ILLAR TRIM
- INSTALLATION).
(11) Reinstall t he pin ch welt to th e front door
openin g (Fig. 44).
(12) Do not recon nect the bat tery negative ca ble a t
this t ime. The supplemental restra int syst em verifi-
cation test procedure sh ould be performed following
service of any supplem ental r estraint syst em compo-
nent . (Refer to 8 - ELE CTRICAL/RESTRAINTS -
STANDARD PROCEDURE - VERIFICATION TE ST).
SI DE I M PACT SEN SOR
DESCRIPTION
On vehicles equipped with the opt iona l side cur tain
air bags, t wo side impact sensors are used, on e ea ch
for the left a nd right sides of the vehicle (Fig. 51).
These sensors are m ounted remotely fr om the bi-di-
rectional safing sensor t hat is in tern al to the Airba g
Contr ol Module (ACM). The side impact sensors are
each secu red with two screws to the forward vert ical
su rface of the right and left fron t door step wells an d
concealed beh ind the step well t rim pa neling within
the pa ssen ger compartment.
The impact sensor h ousing has a n int egra l connec-
tor recept acle and two in tegr al mou ntin g flanges, on e
at t he t op and one a t the bott om. An arrow on the
sensor housin g provides a visual verificat ion of the
pr oper orientation of t he u nit , an d should a lways be
pointed towa rd th e outboard side of the veh icle. A
cavity in the center of th e molded plast ic impact sen-
sor housing cont ain s the electronic circu itr y of the
sensor, which includes an electr onic commu nication
chip and a n electr onic impact sensor. Potting m ate-
ria l fills the cavity to seal and protect th e int erna l
electronic circu itry an d components. The side im pa ct
sensors are ea ch connected t o the vehicle electrical
system thr ough a dedica ted take out and con nector of
the vehicle wire har ness.
The side im pa ct sen sor s can not be repair ed or
adju st ed and, if dam aged or faulty, they mu st be
repla ced.
OPERATION
The side impa ct sensors are electr onic accelerome-
ters tha t sen se the rate of vehicle deceler ation, which
pr ovides verification of the direct ion and severity of
an impact. Each sensor also conta ins an elect ronic
communicat ion chip t hat allows th e unit to com mu-
nica te the sensor status a s well as sensor fault infor-
mation t o th e microprocessor in t he Airba g Control
Module (ACM). The ACM microprocessor continu-
ously monitors all of t he passive rest raint system
electrical cir cuit s t o deter mine the system r eadin ess.
If the ACM detect s a m onitored syst em fau lt, it sets
a Diagnostic Trouble Code (DTC) a nd con trols the
air bag indicator operation a ccordingly.
The impact sen sor s each receive bat tery cur rent
and grou nd t hrough dedicat ed left and right sensor
plus and m inus circu its from t he ACM. The impact
sensors and the ACM communicate by modulating
the volta ge in t he sensor plus cir cuit . The hard wir ed
circuits between t he side impact sensors and t he
ACM m ay be diagnosed a nd test ed using conven-
tional diagnostic tools and procedures. H owever, con -
vent iona l diagn ostic m ethods will not prove
conclusive in t he diagnosis of the ACM or the impact
sensors. The most reliable, efficien t, a nd accurate
mean s to diagnose the impact sensors, the ACM, and
the elect ronic message communica tion between t he
sensors and the ACM requires the u se of a diagnostic
sca n tool. Refer to th e appropriate diagnostic infor-
mation.
Fig. 51 Side Impact Sensor
1 - MOUNTING FLANGE (2)
2 - IMPACT SENSOR
3 - CONNECTOR RECEPTACLE
VA RESTRAINTS 8O - 39
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