1996 ACURA RL KA9 Service Repair Manual

SRS Airba g Syste m - '9 9 - 0 1 Model s
SRS Airba g
The SR S is a safet y devic e which , whe n use d i n conjunctio n wit h th e sea t belt , i s designe d t o hel p protec t th e drive r an d
fron t passenge r i n a fronta l impac t exceedin g a certai n se t limit . Th e syste m consist s o f th e SR S uni t (including safing sen -
so r an d fron t impac t sensor) , th e cabl e reel , th e driver' s airba g an d fron t passenger' s airbag .
Sid e Airbag s
Sid e airbag s locate d i n eac h fron t seat-bac k ca n hel p protec t th e uppe r tors o o f th e drive r o r fron t sea t passenge r during a
moderat e t o sever e sid e impact . Sensor s i n eac h doo r sil l an d i n th e SR S uni t detec t suc h a n impac t an d instantl y inflat e
th e driver' s o r th e passenger' s sid e airbag . Onl y on e sid e airba g wil l deplo y durin g a sid e impact . I f th e impac t i s o n th e
passenger' s side , th e passenger' s sid e airba g wil l deplo y eve n if ther e is n o passenger .
Th e sid e airba g syste m als o include s a n Occupan t Positio n Detectio n Syste m (OPDS) . Thi s syste m consist s o f sensor s an d
a contro l uni t locate d i n th e fron t passenger' s seat-back . Th e contro l uni t send s occupan t heigh t an d positio n dat a t o th e
SR S unit . I f th e SR S uni t determine s tha t th e fron t passenger' s hea d i s i n th e deploymen t pat h o f th e sid e airbag , i t wil l
automaticall y disabl e th e airbag . Whe n th e sid e airba g i s disabled , th e Sid e Airba g indicato r ligh t i n th e gaug e assembl y
alert s th e drive r tha t th e passenger' s sid e airba g wil l no t deplo y i n a sid e impact .
Sea t Bel t Tensione r
Th e sea t bel t tensione r i s linke d wit h th e SR S airbag s t o furthe r increas e th e effectivenes s o f th e sea t belt . I n a front-en d
collision , th e tensione r instantl y retract s th e bel t firml y t o secur e th e occupant s i n thei r seats .
Operatio n
The mai n circui t i n th e SR S uni t sense s an d judge s th e forc e o f impac t and , i f necessary , ignite s th e inflato r charges . I f bat -
ter y voltag e i s to o lo w o r powe r i s disconnecte d du e t o th e impact , th e voltag e regulato r an d th e back-u p powe r circui t
respectivel y wil l kee p voltag e a t a constan t level .
Fo r th e SR S to operate :
Airba g an d Sea t Bel t Tensione r
(1 ) Th e fronta l impac t senso r mus t activate , an d sen d electri c signal s t o th e microprocessor .
(2 ) Th e microprocesso r mus t comput e th e signals , an d dependin g o n th e severit y o f th e collisio n an d whethe r th e sea t
bel t buckl e switc h i s O N o r OFF , i t send s th e appropriat e signal s t o th e airba g inflator s an d sea t bel t tensioners .
(3 ) Th e inflator s tha t receive d signal s mus t ignit e an d deplo y th e units .
Sid e Airba g
(1 ) Th e sid e impac t sensor s mus t activate , an d sen d electri c signal s t o th e microprocessor .
(2 ) Th e microprocesso r mus t comput e th e signal s an d sen d the m to th e sid e airba g inflators . Howeve r th e microproces -
so r cut s of f th e signal s t o th e fron t passenger' s sid e airba g i f th e SR S uni t determine s tha t th e fron t passenger' s hea d
i s i n th e deploymen t pat h o f th e sid e airbag .
(3 ) Th e inflato r tha t receive d th e signa l mus t ignit e an d deplo y th e sid e airbag .
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Description
SRS Airba g Syste m - '9 9 - 0 1 Model s (cont'd )
Self-diagnosi s Syste m
A self-diagnosi s circui t i s buil t int o th e SR S unit ; whe n th e ignitio n switc h i s turne d O N (II) , th e SR S indicato r ligh t come s
o n an d goe s of f afte r abou t 6 second s i f th e syste m is operatin g normally .
I f th e ligh t doe s no t com e on , o r doe s no t g o of f afte r 6 seconds , o r i f i t come s o n whil e driving , i t indicate s a n abnormalit y
i n th e system . Th e syste m mus t b e inspecte d an d repaire d a s soo n a s possible .
Fo r bette r serviceability , th e SR S uni t memor y store s th e caus e o f th e malfunction , an d th e uni t i s connecte d t o th e dat a
lin k connecto r (DLC) . Thi s informatio n ca n b e rea d wit h th e Hond a PG M Teste r whe n it i s connecte d to th e DL C (16P) .
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Precautions/Procedures
General Precaution s
• Carefull y inspec t an y SR S par t befor e yo u instal l it . D o
no t instal l an y par t tha t show s sign s o f bein g droppe d
o r improperl y handled , suc h a s dents , crack s o r defor -
mation :
Airbag s (fronta l airbag s an d sid e airbags )
Cabl e ree l
SRS uni t
Sea t bel t tensioner s
• Us e onl y a digita l multimete r t o chec k th e system . I f
it' s no t a Hond a multimeter , mak e sur e it s outpu t i s
1 0 m A (0.0 1 A ) o r les s whe n switche d t o th e smalles t
valu e i n th e ohmmete r range . A teste r wit h a highe r
output coul d damag e th e airba g circui t o r caus e acci -
denta l deploymen t an d possibl e injury .
• D o no t instal l use d SR S part s fro m anothe r vehicle .
Whe n makin g SR S repairs , us e onl y ne w parts .
• Excep t whe n performin g electrica l inspections ,
alway s disconnec t bot h th e negativ e cabl e an d posi -
tive cabl e fro m th e battery , an d wai t a t leas t 3 min -
utes befor e beginnin g work .
• Replacemen t o f th e combinatio n ligh t an d wiper /
washe r switche s an d cruis e contro l switc h ca n b e
don e withou t removin g th e steerin g wheel :
For combinatio n ligh t an d wiper/washe r switc h
replacement , se e sectio n 23 .
Fo r cruis e contro l set/resume/cance l switc h
replacement , se e sectio n 4 .
• Wheneve r th e ignitio n switc h is O N (II) , o r ha s bee n
turne d OF F fo r les s tha n 3 minutes , b e carefu l no t t o
bum p th e SR S unit ; th e airbag s coul d accidentall y
deplo y an d caus e damag e o r injury .
• Wheneve r th e airbag s hav e bee n activated , replac e
th e sea t bel t tensioner s an d th e SR S unit .
• Th e origina l radi o ha s a code d thef t protectio n circuit .
B e sur e to ge t th e customer' s cod e numbe r befor e dis -
connectin g th e batter y cables .
• Th e PC M memor y mus t b e rese t afte r reconnectin g th e
batter y (se e pag e 11-125 ).
Airba g Handlin g an d Storag e
Do no t tr y t o disassembl e an y o f th e airbags , fronta l o r
side . The y hav e n o serviceabl e parts . Onc e a n airba g
ha s bee n operate d (deployed) , i t canno t b e repaire d o r
reused .
For temporar y storag e o f a n airba g durin g service ,
please observ e th e followin g precautions :
• Stor e a remove d airba g wit h th e pa d surfac e u p an d a
remove d sid e airba g wit h th e cautio n labe l surfac e up .
Al l airba g connector s hav e a built-i n shor t contac t (se e
page 24-30 ).
If a n airba g is improperl y store d fac e down ,
accidenta l deploymen t coul d prope l th e uni t wit h enoug h
forc e to caus e seriou s injury .
AIRBA G CONNECTOR S(With built-i n shor t contact )
• Stor e a remove d airba g o n a secur e fla t surfac e
awa y fro m an y hig h hea t sourc e (exceedin g
200°F/93°C ) an d fre e o f an y oil , grease , detergen t o r
water .
CAUTION : Imprope r handlin g o r storag e ca n internall y
damag e a n airbag , makin g it inoperative .
K yo u suspec t a n airba g ha s bee n damaged , instal l a ne w
unit , an d refe r t o th e Deployment/Disposa l Procedure s fo r
disposin g o f th e damage d airbag .
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