1997 ACURA NSX Service Repair Manual

Supplemental Restrain t Syste m (SRS )
Components/Wirin g Location s
CAUTION: Mak e sur e al l SR S groun d location s ar e clea n an d ground s ar e securel y attached .
NOTE:
• Al l SR S electrica l wirin g harnes s ar e covere d wit h yello w insulation .
• Replac e th e entir e affecte d SR S harnes s assembl y i f i t ha s a n ope n cirui t o r damage d wiring .
SRS INDICATO R LIGH T (I n th e gaug e assembly ) T O CRUIS E CONTRO L
Troubleshooting , pag e 24-1 3 SET/RESUME SWITC H
Gaug e assembly , Sectio n 23 . CABL E REE L t o
DRIVER' S AIRBA G
3P Connecto r
TO HOR N SWITC H
DRIVER' S AIRBA G ASSEMBL Y
(Airba g an d Inflator )
Removal/Installation ,page 24-34/24-3 5Disposal, pag e 24-3 7
CABL E REE L t oSR S MAI N HARNES S6P Connecto r
LEFT DAS H SENSO RRemoval/Installation ,page 24-47/24-4 8
CABLE REE LRemoval/Installation ,page 24-42/24-4 4
PASSENGER' S AIRBA G ASSEMBL Y
(Airba g an d inflator )
Removal/Installation ,
pag e 24-34/24-3 5
Disposal , pag e 24-3 7
SRS MAI N HARNES S toPASSENGER' S AIRBA G
3 P Connecto r
RIGH T DAS H SENSO R
Removal/Installation ,
page 24-47/24-4 8
SRS MAI N HARNES S
t o RIGH T DAS H SENSO R
2 P Connecto r
SRS MAI N HARNES SSRS MAI N HARNES S t o FLOO R WIR E HARNES S
4 P Connecto r
UNDER-DAS H
FUS E BO X
SR S MAI N HARNES S
to UNDER-DAS HFUSE BO X
2 P Connecto r
LEF T DAS H SENSO R
t o SR S MAI N HARNES S
2 P Connecto r
SRS UNI T(Includin g safin g sensor )Removal/Installation ,
pag e 24-49/24-5 2 PASSENGER'
S SEA T BEL T
TENSIONE R
Removal/Installation ,
pag e 24-51/24-5 2
Disposal , pag e 24-3 7
PASSENGER' S SEA T BEL T
TENSIONE R t o
FLOO R WIR E HARNES S
3 P Connecto r
FLOO R WIR E
HARNES S
DRIVER' S SEA T BEL T
TENSIONE R
Removal/Installation ,page 24-51/24-5 2Disposal, pag e 24-3 7
TEST HARNES SSOCKET16P Connecto r
SRS MAI NHARNES S SOCKE T
18 P Connecto r
SR
S MAI N HARNES S
t o FLOO R WIR E HARNES S
3 P Connecto r DRIVER'
S SEA T BEL T
TENSIONE R t o
FLOO R WIR E HARNES S
3 P Connecto r
FLOO
R WIR E
HARNES S
FLOOR WIR E HARNES S
t o INDICATO R LIGH T i n
GAUGE ASSEMBL Y
30P Connecto r
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Supplemental Restrain t Syste m (SRS )
Descriptio n
SRS Airba g Syste m
Th e SR S is a safet y devic e which , whe n use d i n conjunctio n wit h th e sea t belts , i s designe d t o protec t th e drive r an d pas -
senge r i n a fronta l impac t exceedin g a certai n se t limit .
Th e syste m is compose d o f lef t an d righ t das h sensors , th e SR S uni t (include s safin g sensor) , th e cabl e reel , driver' s
airbag , an d th e passenger' s airbag .
Sea t Bel t Tensioner s
Th e sea t bel t tensioner s ar e 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 belts . I n a front -
en d collision , th e tensioner s instantl y retrac t th e belt s firml y t o secur e th e occupant s i n thei r seats .
PASSENGER' S
AIRBA G
RIGH T DAS H SENSO R
SRS UNI T
PASSENGER' S SEA T BEL T
TENSIONE R
LEF T DAS H SENSO R
CABL E REE L DRIVER'
S
AIRBA G DRIVER'
S SEA T BEL T
TENSIONE R
Operation
A s show n i n th e diagra m below , th e lef t an d righ t das h sensor s ar e connecte d i n parallel . Th e paralle l se t o f sensor s i s
connecte d i n serie s t o eac h airba g inflato r circui t an d th e vehicl e battery . I n addition , a back-u p powe r circui t i s connecte d
i n paralle l wit h th e vehicl e battery . Th e back-u p powe r circui t an d th e safin g senso r ar e locate d insid e th e SR S unit .
Fo r th e SR S t o operate :
(1 ) On e o r bot h safin g senso r an d on e o r bot h das h sensor s mus t activate .
(2 ) Electrica l energ y mus t b e supplie d t o th e airba g inflato r b y th e battery , o r th e back-u p powe r circui t i f th e batter y
voltag e i s to o low .
(3 ) Airba g an d sea t bel t tensione r charge s mus t b e released . The n th e airbag s wil l deplo y an d th e tensioner s wil l
activate .
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 is 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 si x 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 si x 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 .
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Supplemental Restrain t Syste m (SRS )
Genera l Precaution s
Carefully 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 sing s of bein g
droppe d o r improperl y handled , suc h a s dents ,
crack s o r deformation :
— Airba g assembl y (driver' s an d passenger's) .
— Das h sensors .
— Cabl e reel .
— SR S unit .
— Sea t bel t tensione r (driver' s an d passenger'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
outpu t coul d damag e th e airba g circui t o r caus e ac -
cidenta l deploymen t an d possibl e injury .
D o no t instal l use d SR S part s fro m anothe r car .
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 positiv e ca -
bl e a t th e batter y 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 :
(se e sectio n 23 ) D
o no t tr y t o disassembl e th e airba g assembly . I f ha s 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 .
Fo r temporar y storag e of the airba g assembl y durin g
service , pleas e observ e th e followin g precautions :
• Stor e th e remove d airba g assembl y wit h th e pa d sur -
fac e up .
If th e 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 t o caus e seriou s injury .
SHORT CONNECTO R(RED)
Store th e remove d airba g assembl y o n a secur e fla t
surfac e awa y fro m an y hig h hea t sourc e (exceedin g
212°F/100°C ) an d fre e of an y oil , grease , detergen t
o r water .
CAUTION : Imprope r handlin g o r storag e ca n inter -
nall y damag e th e airba g assembly , makin g i t
inoperative .
If yo u suspec t th e airba g assembl y ha s bee n
damaged , instal l a ne w uni t an d refe r t o th e Deploy -
ment/Disposa l Procedure s fo r scrappin g o f th e
damage d airbag .
Airbag Handlin g an d Storag e
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Seat Bel t Tensione r Handlin g an d Storag e
Do no t tr y disassembl e th e sea t bel t tensione r assem -
bly . I t ha s n o serviceabl e parts . Onc e sea t bel t tensione r
ha s bee n operated , i t canno t b e repaire d o r reused .
SHORTCONNECTO R(RED)
CYLINDE R
POWERSOURC E
SEAT BEL TTENSIONE RASSEMBLY
WEBBING
Store th e remove d sea t bel t tensione r assembl y o n a
secur e fla t surfac e awa y fro m an y hig h hea t sourc e
(exceedin g 212°F/100°C ) an d fre e o f an y oil , grease ,
detergen t o r water . Follo
w thes e precaution s belo w durin g remova l o f a
tensioner .
— Instal l it s shor t connecto r (RED ) a s soo n a s th e
tensione r connecto r i s disconnected .
— Us e onl y th e tes t equipmen t specifie d i n th e
Electrica l section .
— D o no t disassembl e th e tensione r o r allo w an y im -
pac t t o it .
For prope r disposa l se e pag e 24-37 .
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Supplemental Restraint System (SRS)

Steering-related Precautions

Steering Wheel and Cable Reel Alignment:

NOTE: To avoid misalignment of the steering wheel

or airbag on reassembly, make sure the wheels are

turned straight ahead before removing the steering

wheel.

Rotate the cable reel clockwise unit it stops.

Then rotate it counterclockwise (approximately two

turns) until:

—The yellow gear tooth lines up with the mark on

the cover.

—The arrow on the cable reel label points straight up.

ARROW

MARK

YELLOW GEAR TOOTH

ALIGNMENT MARK
Steering Column Removal:

CAUTION:

• Before removing the steering column, first

disconnect the connector between the cable reel

and the SRS main harness.

• If the steering column is going to be removed

without dismounting the steering wheel, lock the

steering by turning the ignition key to 0-LOCK

position or remove the key from the ignition so

that the steering wheel will not turn.

SRS MAIN

HARNESS

CABLE REEL

CONNECTOR

HOLDER

Steering wheel:

Do not replace the original steering wheel with any

other design, since it will make it impossible to pro-

perly install the airbag (only use genuine Honda

replacement parts).

After reassembly confirm that the wheels are still

turned straight ahead and that the steering wheel

spoke angle is correct. If minor spoke angle adjust-

ment is necessary, do so only by adjusting the tie-rods,

not by removing and repositioning the steering wheel.
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Sensor Inspection

CAUTION: Take extra care when painting or doing

body work on any part of the dashboard lower panel.

Avoid direct exposure of the sensors or wiring to heat

guns, welding, or spraying equipment.

• Disconnect both the negative and positive battery

cables.

• Install the short connectors before working around

the dashboard lower panel or the SRS sensors.

• After any degree of frontal body damage, inspect

both dash sensors. Replace a sensor if it is dented,

cracked, or deformed.

• Be sure the sensors are installed securely.

BRACKET
DASHBOARD

LOWER PANEL

MOUNTING

BOLTS
Wiring Precautions

Never attempt to modify, splice or repair SRS wiring.

NOTE: SRS wiring can be identified by special

yellow outer protective covering.

• Be sure to install the harness wires so that they are

not pinched or interfering with other car parts.

• Make sure all SRS ground locations are clean and

grounds are securely fastened for optimum metal-

to-metal contact. Poor grounding can cause inter-

mittent problems that are difficult to diagnose.

DASH

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Supplemental Restrain t Syste m (SRS )
Short Connecto r Installatio n
Install shor t connector s a s follow s wheneve r yo u ar e
workin g nea r SR S wirin g o r components .
CAUTION : Befor e disconnectin g th e airba g con -
nector , b e sur e t o completel y discharg e the
capacito r i n the back-u p circui t (b y turnin g of f th e
ignitio n switc h an d allowin g thre e minute s t o
elapse ) t o preven t a malfunctio n o f th e sea t bel t
tensioners .
1. Disconnec t th e batter y negativ e cable , the n
disconnec t th e positiv e cable .
2 . Remov e th e acces s pane l fro m th e steerin g wheel ,
the n remov e th e shor t connecto r (RED ) fro m th e
panel .
DRIVER' S AIRBA G
ASSEMBL YCABLE REE L 3 PCONNECTO R
DRIVER' S
AIRBA G 3 P
CONNECTO R
ACCES S PANE L SHOR
T CONNECTO R
(RED)
3. Disconnec t th e 3 P connecto r betwee n th e driver' s
airba g an d th e cabl e reel , the n instal l th e shor t con -
necto r (RED ) o n th e airba g sid e o f th e connector .4
. Instal l th e specia l too l t o th e cabl e ree l sid e o f th e
connector .
SHORT CONNECTO R(RED)DRIVER' S AIRBA GASSEMBL Y
CABLE REE L 3 P
CONNECTO R
SR S SERVIC E CONNECTO R
07MAZ - SP0020 A
5. Remov e th e glov e box , the n disconnec t th e con -
necto r betwee n th e passenger' s airba g an d SR S
main harness .
6 . Instal l th e shor t connecto r (RED ) t o th e airba g sid e
o f th e connector .
PASSENGER' S AIRBA GASSEMBL Y
SRS MAI N HARNES S
SHOR
T
CONNECTO R
(RED)
PASSENGER' SAIRBAG 3 P
CONNECTO R
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7. Instal l th e specia l too l t o th e SR S mai n harnes s sid e
o f th e 3 P connector .
SRS MAI N HARNES S
3 P CONNECTO RSRSSERVIC ECONNECTO R07MAZ - SP0020 A
8. Remov e th e righ t rea r sid e tri m pane l
(see section 20 ).
9 . Remov e th e shor t connecto r (RED ) fro m th e shor t
connecto r holder .
SEAT BEL T
TENSIONE R
3 P CONNECTO R
SHORTCONNECTO R
HOLDE R
SEAT BEL T
TENSIONE RASSEMBLY
SHORTCONNECTO R(RED)
FLOO R WIR E HARNES S 3 P CONNECTO R
10. Disconnec t th e sea t bel t tensione r 3 P connector ,
the n instal l th e shor t connecto r (RED ) t o th e
tensione r sid e o f th e connector .
11 . Repea t step s 8 , 9 , an d 1 0 o n th e lef t side .
12 . Afte r completin g repai r work , b e sur e t o remov e
th e shor t connector s an d reconnec t al l SR S
connectors .
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