secur ed t o t h e floor un der t h e Driver sea t a n d
receives power from th e F u se Block No. 1. Wh en-
ever t he ign it ion key is t u r ned t o th e ru n or st a rt
posit ion , t h e ACM per for m s a syst em test . Th e ACM
can n ot be repa ir ed or a dju st ed.
Th e m icr opr ocessor in t h e ACM m onit or s th e
in t ern a l an d ext er na l a ir ba g syst em elect rica l cir-
cuit s to det er min e t h e syst em r ea din ess. Wh en a
mon it or ed syst em is det er m in e t o be ou t of ra n ge,
th e ACM will set bot h a ct ive an d st or ed dia gn ost ic
tr ou ble codes (DTC). Th e ACM a lso con t a in s a n
en er gy-st or age ca pa cit or. Th is capa cit or st or es
en ou gh elect r ica l en er gy to deploy t h e fr on t a irba g
compon en ts for t wo secon ds followin g a ba tt er y
discon n ect or fa ilu r e du rin g an im pa ct .
Th e Acceler om et er in th e ACM is u sed t o sen se
th e r at e of veh icle deceler a tion , pr ovide ver ifica t ion
of th e direct ion an d sever it y of an im pa ct. Wh en t h e
pr eprogr am m ed con dition s a r e m et , the ACM sen ds
an elect rica l sign a l to deploy th e a ppr opr ia t e fron t
air ba g syst em com pon en ts a n d a deploymen t n ot i-
fica t ion .
To pr ovide a n a ccident respon se n ot ifica tion , th e
ACM is h a rdwir ed t o t h e Cen t ra l Tim er module
(CTM) a nd E ngin e Con t rol Modu le (E CM). Wh en a
deploym ent occu r s t he ACM pr ovides a 50m s 10.0
volt pu lse t o t h e CTM a nd E CM. Wh en t h e Acciden t
Repor t n otificat ion sign a l is r eceived th e CTM u n -
locks th e door locks a nd th e ECM st a lls t h e en gin e.
Th e Acciden t sign a l will set a DTC in th e CTM a nd
th e door lock s will n ot wor k u n t il t h e DTC ha s been
er a sed. Th e E CM will set a DTC if t he Acciden t
Repor t cir cu it is sh or ted t o ba t t ery volt a ge. Th e
ACM sa ves t he deploym ent recor d an d a fter t h r ee
deploym ent s th e ACM mu st be r epla ced. Th e
DRBII I" ca n be used t o t est th e Acciden t Repor t
Not ifica tion fea tu r e: select the SYSTEM TE ST fr om
th e ACM m a in m enu . Th en select t h e An alog Cra sh
Ou t pu t Syst em Test .
Th e ACM is ha r dwir ed to t he Inst r u men t Clu st er
(MIC) t o contr ol War nin g In dica t or (SRS in dica t or).
Wh en DTCs becom es a ct iva te, th e ACM illu m in a tes
th e War nin g In dica tor by pu llin g th e in dica tor
cir cu it low. Th e SRS in dica tor is t he on ly point a t
wh ich the cu st omer ca n obser ve sym pt om s of a
syst em m alfu nct ion .
As pa rt of th e syst em test th e ACM illu m in a tes
th e War n in g In dica t or on for 4.0 secon d bu lb test .
After th e la mp ch eck, if t he in dica t or t u r ns off, it
mea n s t ha t the ACM ha s ch ecked t he syst em an d
foun d it t o be free of discer n ible ma lfun ct ion s.
NON-CRITICAL DTCs
If t h e la mp com es on an d st a ys on for a per iod
lon ger th a n 4.0 secon ds (a bou t 10.0 secon ds) is
usu a lly a st or ed DTC (in t er m it t en t pr oblem ) in t h e
system.
CRITICAL DTCs
DTCs t ha t could lea d to a con dition wh er e th e
sa fet y devises m a y not deploy or in cor rect ly deploy.
In th e even t of su ch a DTC, th e sa fet y of t h e vehicle
occupa n t s can no lon ger be gu a ra n t eed. If t h e lam p
rem a in s on , t h er e could be an a ct ive DTC in t h e
syst em . Som e DTCs, In ter n al Modu le a n d squib
DTCs, will k eep t h e i n dica t or illu min at ed even if
th e codes a re no lon ger a ctive.
ACM NOT CONFIGURED FOR PASSENGER
AIRBAG AND TENSIONER
If a fter repla cin g t he ACM t h e Air ba g Wa r nin g
In dica t or fla sh es con tin u ously t h e ACM m ust be
configu r ed for th e P a ssen ger Air ba g a n d Ten sion er.
Select Miscella n eous from th e ACM m ain men u a n d
configu r e th e Pa ssen ger Airba g Ten sion er squ ibs.
WARNING:
THE AIRBAG SYSTEM IS A
SENSITIVE, COMPLEX ELECTROMECHANICAL
UNIT. BEFORE ATTEMPTING TO DIAGNOSE OR
SERVICE ANY AIRBAG SYSTEM OR RELATED
STEERING WHEEL, STEERING COLUMN, OR
INSTRUMENT PANEL COMPONENTS YOU MUST
FIRST DISCONNECT AND ISOLATE THE
BATTERY NEGATIVE (GROUND) CABLE. WAIT
TWO MINUTES FOR THE SYSTEM CAPACITOR
TO DISCHARGE BEFORE FURTHER SYSTEM
SERVICE. THIS IS THE ONLY SURE WAY TO
DISABLE THE AIRBAG SYSTEM. FAILURE TO
DO THIS COULD RESULT IN ACCIDENTAL
AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
WARNING: TO AVOID PERSONAL INJURY OR
DEATH, NEVER STRIKE OR KICK THE
AIRBAG CONTROL MODULE, AS IT CAN
DAMAGE THE IMPACT SENSOR OR AFFECT
ITS CALIBRATION.
WARNING: IF AN AIRBAG CONTROL
MODULE IS ACCIDENTALLY DROPPED
DURING SERVICE, THE MODULE MUST BE
SCRAPPED AND REPLACED WITH A NEW
UNIT. FAILURE TO TAKE THE PROPER
PRECAUTIONS COULD RESULT IN
ACCIDENTAL AIRBAG DEPLOYMENT AND
PERSONAL INJURY OR DEATH.
3.1.1 DRIVER AIRBAG
Th e a ir ba g prot ect ive t rim cover is th e m ost
visible pa r t of t h e dr iver side a ir ba g syst em . The
air ba g is m ou nt ed dir ect ly t o t he st eer in g wh eel.
Loca t ed u n der th e t r im cover ar e th e a irba g cush ion
an d t h e a irba g cu sh ion suppor t in g com pon en ts.
2
GEN ERAL I N FORM AT I ON
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