horn ACURA NSX 1991 Service Repair Manual

Idle Contro l Syste m
Brake Switc h Signa l
This signal s th e EC M whe n th e brak e peda l i s depressed .
Are th e brak e light s o n withou tdepressin g th e brak e pedal ?Inspec t th e brak e switc h (se e
sectio n 19 ).
Depres s th e brak e pedal .
D o th e brak e light s com e on ?
Is th e fus e OK ?
Chec k fo r a n ope n in th e wire :
1 . Depres s th e brak e pedal .
2 . Measur e voltag e betwee n
EC M connecto r terminal s F1 6
an d A2 6 wit h th e brak e peda l
depressed . —
Repai r shor t i n th e wir e
betwee n th e brak e switc h
an d th e BRAK E LIGH T S W
HOR N (2 0 A ) fuse .
— Replac e th e BRAK E LIGH T
S W HOR N (2 0 A ) fuse .
WIR E SID E O F FEMAL E TERMINAL S
I s ther e batter y voltage ? Repai
r ope n i n th e wir e betwee n
th e EC M (F16 ) an d th e brak e
switch .
Inspectio
n o f Brak e Switc h Signal .
Inspect th e BRAK E LIGH T S W
HORN (20 A ) fus e i n th e under -
hood fuse/rela y box .
Repai r ope n i n th e wir e
betwee n th e brak e switc h
an d th e BRAK E LIGH T S W
HOR N (2 0 A ) fuse .
Inspec t th e brak e switc h (se e
sectio n 19 ).
ECM CONNECTOR S
Brak e switc h signa l i s OK .
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Steering Wheel

Removal

7. Disconnect the connectors from the horn and cruise

control set/resume switches, then remove the cable

reel connector from its clips.

CRUISE CONTROL

SET/RESUME SWITCHES

4P CONNECTOR

HORN

CONNECTOR

CABLE

REEL

CONNECTOR
8. Remove the steering wheel nut.

9. Remove the steering wheel by rocking it slightly

from side-to-side as you pull steadily with both

hands.

STEERING WHEEL

NUT

Replace.ProCarManuals.com

Installation

NOTE: Before installing the steering wheel, make sure

the front wheels are straight ahead.

CAUTION:

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

not pinched or interfering with other car parts.

• Do not replace the original steering wheel with any

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

erly install the airbag. (Use only genuine Honda

replacement parts.)

• After reassembly, confirm that the wheels are still

straight ahead and that steering wheel spoke angle

is correct. If minor spoke angle adjustment is neces-

sary, adjust the tie-rods only. Do not remove and

reposition the steering wheel.

Confirm that the airbag assembly is securely

attached to the steering wheel; otherwise, severe per-

sonal injury could result during later airbag deploy-

ment.

1. Before installing the steering wheel, center the

cable reel.

Do this by first rotating the cable reel clockwise

until 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

CABLE REEL

YELLOW GEAR TOOTH

ALIGNMENT MARK
2. Install the steering wheel.

NOTE: Be sure the steering wheel shaft engages

the cable reel.

STEERING WHEEL

NUT

Replace.

50 N-m

(5.0 kg-m, 36 Ib-ft)

PIN

3. Insert the cruise control set/resume 4P connector

and airbag 3P connector to the steering wheel clips.

4. Connect the horn connector.

CRUISE CONTROL

SET/RESUME SWITCHES

4P CONNECTOR

HORN

CONNECTOR

CABLE REEL

CONNECTOR
PINProCarManuals.com

Steering Wheel

Installation

5. Install the airbag assembly with new Torx bolts.

TORX BOLT

10 N-m (1.0 kg-m, 7 Ib-ft)

Replace.

TORX BOLTS

10 N-m (1.0 kg-m, 7 Ib-ft)

Replace.
AIRBAG ASSEMBLY

6. Disconnect the short connector from the airbag 3P

connector.

7. Connect the airbag 3P connector and cable reel 3P

connector.

8. Attach the short connector to the access panel, then

install the access panel on the steering wheel lower

cover.

ACCESS PANEL

SHORT CONNECTOR

(RED)
9. Connect the battery positive terminal, and then con-

nect the negative terminal.

10. After installing the airbag assembly, confirm proper

system operation:

• Turn the ignition to II: the instrument panel SRS

indicator light should come on for about six sec-

onds and then go off.

• Confirm operation of horn buttons.

• Confirm operation of cruise control set/resume

switch.

• Turn the steering wheel counterclockwise and

make sure the yellow gear tooth still lines up

with the alignment mark.

YELLOW GEAR TOOTH

ALIGNMENT MARKProCarManuals.com

Front Bumpe r
Replacemen t
1. Loose n th e mountin g screw , the n pul l th e righ t an d lef t fron t tur n signa l light s ou t an d disconnec t th e connectors .
2 . Remov e th e skir t covers , the n remov e th e bumpe r mountin g bolt s o n eac h side , an d lowe r skir t mountin g bolt .
3 . Lowe r th e inne r fender , the n remov e th e bumpe r mountin g nut s an d th e skir t mountin g bolt s fro m insid e th e fron t
fende r o n eac h side .
4. Lif t an d remov e th e fron t bumper .
NOTE:
• Disconnec t th e washe r hose , hor n connecters , an d ambien t senso r connector .
• A n assistan t i s helpfu l whe n removin g th e fron t bumper .
• Tak e car e no t t o scratc h th e fron t bumper .
BUMPER BRACKE T HOO K
INNER FENDE R
FRON T TUR N
SIGNA L LIGH T
5. Installatio n i s th e revers e o f th e remova l procedure .
NOTE : Inser t th e bumpe r bracke t hook s int o th e bumpe r bracke t holes .
CONNECTOR S
CORROSIO N RESISTAN T BOLT/NU T
BUMPE
R MOUNTIN G BOLT S
8 x 1.2 5 mm 2 2 N- m(2.2 kg-m , 1 6 Ib-ft ) AMBIEN
T
SENSOR
FRONT BUMPE R
HORN
CONNECTOR S
FRONT TUR N
SIGNA L LIGH T
SKIR T COVE R
LOWE R SKIR T MOUNTIN G
BOLT
MOUNTIN G SCRE W
SKIR T COVE R SKIR
T MOUNTIN G BOLT S
6 x 1. 0 m m10 N- m (1. 0 kg-m ,7.2 Ib-ft ) BUMPE
R MOUNTIN G NUT S
6 x 1. 0 m m10 N- m (1. 0 kg-m ,7.2 Ib-ft )
BUMPE R BRACKE T HOL E
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Relay and Control Unit Locations

Front Compartment

HORN RELAY

A/C COMPRESSOR CLUTCH

RELAY

RADIATOR FAN

LOW RELAY

RADIATOR FAN

HIGH RELAY

CONDENSER FAN RELAY

UNDER-HOOD RELAY BOX A
LEFT HEADLIGHT RETRACTOR

CUT RELAY
WINDSHIELD WIPER

LOW RELAY

WINDSHIELD WIPER

INTERMITTENT RELAY

POWER AMPLIFIER

RELAY
ABS

REAR FAIL-SAFE RELAY

ABS FRONT

FAIL-SAFE RELAY

HEADLIGHT RELAY
RIGHT HEADLIGHT RETRACTOR RELAY

Wire colors: BLU/GRN,

BRN/WHT, BLU/RED,

GRN/YEL, and BLK

LEFT HEADLIGHT RETRACTOR RELAY

Wire colors: BLU/BLK,

WHT/BLK, GRN/RED,

BLU,
and BLK
RIGHT HEADLIGHT RETRACTOR

CUT RELAY

BLOWER RELAY

BLOWER HIGH RELAY

WINDSHIELD WIPER

HIGH RELAY

WINDSHIELD

WASHER RELAY

UNDER-HOOD

RELAY BOX B

DIMMER RELAY

POWER WINDOW

RELAY

TAILLIGHT RELAY

ABS MOTOR RELAY

UNDER-HOOD FUSE/RELAY BOXProCarManuals.com

Horns

Component Location Index

SRS components are located in this area. Review the

SRS component locations, precautions, and procedures

in the SRS section (24) before performing repairs or ser-

vice.

HORN RELAY

Test, page 23-249

UNDER-HOOD RELAY

BOX A
CABLE REEL

Test, page 23-250
HORN SWITCH
Test, page 23-249
Overhaul, section 17
SECURITY HORNTest, page 23-248
LEFT HORN
Test, page 23-248
RIGHT HORN
Test, page 23-248
SECURITY CONTROL
UNIT
Inpu
t
Test, page 23-320
('94-'96) ('93) ('91-'92)
UNDER-HOOD

FUSE/RELAY BOX

Description

Security Alarm System:

The security alarm system is an anti-theft alarm system. If someone tries to open the trunk, hood or either door without

the ignition key, or if the roof is not fully latched the security control unit senses a signal from the sensors and activates
relays to flash the headlights and sound the horn for about two minutes.ProCarManuals.com

Horns
Horn Tes t
1. Disconnec t th e 2- P connecto r fro m th e horn .
2 . Remov e th e righ t an d lef t horns .
2-P CONNECTO R
RIGHT HOR N
Securit y Horn :
2-P CONNECTO R
SECURITY
HOR N
3. Tes t th e hor n b y connectin g powe r t o th e A or B
terminal s an d groun d t o th e other . Th e hor n shoul d
sound .
4 . I f th e hor n fail s t o sound , replac e it .
MOUNTIN G BOL T
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Horns
Switc h Tes t (cont'd )
5. Disconnec t th e cabl e ree l harnes s 6- P connecto r
from th e SR S mai n harness , the n connec t tes t
harnes s C onl y t o th e cabl e ree l harness .
CABLE REE L
HARNES S
6- P CONNECTO R
TES T
HARNES S C
07LA Z - SL4030 0
Continuity ?
6. Chec k fo r continuit y betwee n th e No . 3 termina l
and bod y groun d wit h th e hor n switc h pressed .
There shoul d b e continuity .
• I f ther e is continuity , th e hor n switc h i s OK .
• I f ther e i s n o continuity , g o t o ste p 7 .
7. Remov e th e Tor x bolt s usin g a Tor x T3 0 bit , the n
remov e th e airba g assembly .
Stor e a remove d airba g assembl y
wit h th e pa d surfac e up . I f 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 .
ACCES SPANEL
CRUIS E CONTRO L
SWITC H COVE R
TOR X BOL T
1 0 N- m (1. 0 kg-m , 7. 2 Ib-ft )
Replace .
Us e a Tor x T3 0 bi t
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Troubleshooting
Cruise Control

NOTE:

• The numbers in the table show the troubleshooting sequence.

• Before troubleshooting:

— Check the No. 5 (15 A) fuse in the under-dash fuse box, and the No. 29 (50 A) and No. 45 (20 A) fuses in the under-

hood fuse/relay box.

— Check that the horns sound.

— Make sure that the headlights go off.ProCarManuals.com