open hood ACURA NSX 1991 Service Repair Manual

Engine Coolant Refilling and Bleeding

CAUTION: When pouring engine coolant, be sure to

shut the relay box lid and not let coolant spill on the

electrical parts or the paint. If any coolant spills, rinse it

off immediately.

NOTE:

• Perform this maintenance when the engine is cool.

• Before replacing the coolant, turn the ignition ON,

slowly turn the climate control temperature knob to

90° and turn off the ignition. This will allow the

coolant in the heater to drain out with the rest of the

system.
1. Open the hood, the rear window and the engine

cover.

2. Remove the cover protecting the water pipes and

shift cables on the underside of the car.

3. Before removing the expansion tank cap, first

loosen the cap to lower pressure.

CAUTION: Do not remove the expansion tank cap

when engine is hot. The coolant is under pressure

and may blow out and scald you. Open the cap

slowly when the engine is cool.

4. Loosen the drain plug in the bottom of the radiator,

and drain the coolant.

5. Remove the two drain bolts from the water pipes,

and drain the coolant.

WASHERS

Replace.

DRAIN BOLTS

15 N-m (1.5 kg-m, 11 Ib-ft)
DRAIN HOLE
DRAIN PLUGProCarManuals.com

Opener/Latch/Opener Cabl e Replacemen t
1. Remov e th e mountin g bolts , the n remov e th e hoo d releas e handl e an d disconnec t th e opene r cable .
2 . Remov e th e mountin g bolt s an d cover , the n remov e th e hoo d latc h an d disconnec t th e opene r cabl e an d hoo d switc h
connector .
3 . Remov e th e lef t sid e inne r fender , the n pul l ou t th e opene r cable .
NOTE :
• Befor e pullin g ou t th e opene r cable , ti e a strin g t o th e cabl e s o yo u can pull i t bac k i n later .
• Tak e car e no t t o ben d th e opene r cable .
MOUNTIN G BOLT S6 x 1. 0 m m10 N- m (1. 0 kg-m ,7.2 Ib-ft )
OPENE R CABL E
HOOD SWITC HBe carefu l no t t o damag e th ehoo d switch .
OPENE R CABL E
HOOD SWITC HCONNECTO R
HOOD LATC H
HOOD RELEAS EHANDLETo remov e th e hoo d releas e handle ,first remov e th e sid e sil l tri m(se e pag e 20-38 ).
MOUNTIN G BOLT S6 x 1. 0 m m10 N- m (1. 0 kg-m ,7.2 Ib-ft )
COVE R
MOUNTIN G BOL T6 x 1. 0 m m10 N- m (1. 0 kg-m ,7.2 Ib-ft )
HOO D EDG E CUSHIO NTurn a s neede d t o mak e th ehoo d fi t flus h wit h th e bumpe rand headligh t lid .
4. Installatio n i s th e revers e of the remova l procedure .
NOTE:
• Mak e sur e th e opene r cabl e i s route d an d connecte d properly .
• Adjus t th e hoo d alignment .
• I f necessary , replac e an y damage d clips .
INNER FENDE R
OPENER CABL E
ALIGNMENT :
• Mov e th e latc h u p o r down , o r righ t o r left , a s neede d
t o equaliz e th e ga p betwee n th e hoo d an d th e fron t
bumper .
CORROSIO N RESISTAN T BOL T
HOOD LATC H
ProCarManuals.com

(G551) '95-'96 Models.
(G401,G402,G551) '93-94 Models or
Brake Switch
Test

1
.
If one of the brake lights does not go on, check that
brake
light bulb in the taillight or the high mount light
2
.
If none of the brake lights 90 on, check the No. 45 (2

0
A) fuse in the under-hood fuse/relay box.
3

.
If the fuse and bubs are OK, disconnect the 4-P con- necto

r
from the brake switch.

4-P CONNECTOR

BRAKE

SWITCH
BRAKE
PEDAL

4. Check for continuity between the B and C terminals. There should be continuity with the brake pedal

pushed.

If there is no continuity, replace the switch or ad-
just pedal height (see section 19).
If there is continuity, but the brake lights do not
go on, inspect for:
Poor ground (G401,G501) '91-'92 Models or
An open in the WHT/GRN or GRN/WHT wire. Faulty brake light failure sensors (see page 23-153). High Mount Brake Light Test
1. Open the trunk lid and engine compartment lid.
2. Disconnect the 2-P connector from the trunk wire
harness.

TRUNK WIRE HARNESS

SIDE WIRE
HARNESS

View from terminal side
View from

terminal

side
3. Connect a voltmeter positive lead to the GRN/WHT terminal and the negative lead to the BLK terminalof the side wire harness side of the connector.
Push the brake pedal, and check for voltage between
the GRN/WHT and the BLK terminals. There should be battery voltage. If there is no voltage, check for:
— Blown No. 45 (20 A) fuse in the under-hood
fuse/relay box.
— An open in the GRN/WHT or BLK wire.
— Faulty brake switch.
If there is battery voltage, go to step 4.
4. Connect battery power to the GRN/WHT terminal and ground to the BLK terminal of the trunk wireharness side of the connector.
Check that all the LEDs of the high mount brake light

go on.

If the high mount brake light does not go on,check for an open in the wires
in the trunk lid.
If the wires in the trunk lid are OK, replace the
high mount brake light.
If some of the LEDs do not go on,
replace the high
mount brake light assembly.
GRN/WHT BLK


BLK GRN/WHTProCarManuals.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

Power Windows
Component Location Index
POWER WINDOW

RELAY
Test
,
page 23-277
('94-'96) ('91-'93)
PASSENGER'S SWITCH

Test, page 23-274('94-'96)

Replacement, page
23-275
PASSENGER'S DOOR SWITCH

Test, page 23-204
PASSENGER'S MOTOR

Test, page 23-276('94-'96) ('91-'93)

Replacement, section 20
DRIVER'S DOOR SWITCH
Test, page 23-204
DRIVER'S MOTORTest, page 23-276('94-'96) ('91-'93)
Replacement,
section 20
MASTER SWITCH

Test, page 23-273 ('94-'96) ('91-'93)
Replacement, page 23-274
('94-'96) ('91-'93)

POWER WINDOW
CONTROL UNIT
Input test, page 23-272
('94-'96) ('91-'93)
KEY-OFF TIMER CIRCUIT
(In the integrated control unit)
Input test, page 23-168
('94-'96) ('91-'93)
UNDER-DASH FUSE BOX

UNDER-HOOD FUSE/RELAY

BOX

Description

Power Window Key-off Timer Operation:
The power windows can still be operated for about ten minutes after the ignition switch is turned from the "II" to the "I"
or "O" position as long as neither of the doors has been opened. This provides a convenience to parked occupants while
offering a degree of security against unwanted or accidental window operation.ProCarManuals.com

Windshield Wiper Motor Test

1. Open the hood, and remove the cap nuts and the

wiper arms. Don't let the wiper arms hit the hood.

WIPER

ARM
WINDSHIELD LOWER MOLDING

HOOD SEAL
AIR SCOOP

2. Remove the windshield lower molding, hood seal and

air scoop by prying off the trim clips and removing

the screws.

3. Disconnect the 5-P connector from the wiper motor

assembly.

View

from

terminal

side
4. Test motor operation:

LOW SPEED: Connect battery power to the B

(GRN/BLK) terminal and ground to

the Lo (BLU) terminal.

HIGH SPEED: Connect battery power to the B

(GRN/BLK) terminal and ground to

the Hi (BLU/YEL) terminal.

If the motor fails to run smoothly, replace it.

5. Connect an analog voltmeter, between the As (BLU/

WHT) and the E (BLK) terminals. Run the motor by

connecting battery power to the B (GRN/BLK) termi-

nal and ground to the Lo (BLU) terminal.

The voltmeter reading should alternately indicate

0 V and more than 4 V.
CAP

NUTProCarManuals.com

Wipers/Washers

Windshield Wiper MotorReplacement
1. Open the hood, and remove the cap nuts and the wiper arms. Don't let the wiper arms hit the hood.
2. Remove the windshield lower molding, hood seal
and air scoop by prying off the trim clips and

removing the screws (see page 23-293 ('94-'96) ('93)
('91-'92).

3. Disconnect the 5-P connector from the wiper motor assembly, then remove the two mounting bolts and
the wiper linkage assembly.

WIPER LINKAGE ASSEMBLY

5-P CONNECTOR

4. Remove the three mounting bolts and nut from the wiper linkage assembly, and remove the wiper
motor.

MOUNTING

BOLTS

8 N·m
(0.8 kg-m,

5.8 Ib-ft)

NUT

18 N·m (1,8 kg-m, 13 Ib-ft)

WIPER LINKAGE

ASSEMBLY

WIPER MOTOR

5. Install the wiper motor assembly in the reverse order of removal.
DASHBOARD LOWER

PAD
DASHBOARD LOWER
COVER

Windshield Wiper/Washer Switch

Replacement

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.

1. Remove the dashboard lower cover, and disconnect the connectors.
2. Remove the dashboard lower pad.ProCarManuals.com

Security Alar m Syste m
Descriptio n
This syste m is activate d automaticall y 1 5 second s afte r everythin g ha s bee n close d an d locked . Th e securit y alar m syste m
indicato r ligh t locate d o n th e driver' s doo r pane l wil l flas h afte r th e door s ar e properl y locked .
I f an y o f th e followin g condition s occur , th e horn s wil l sound , th e headlight s wil l po p u p an d flash , an d th e sid e marke r
lights , parkin g light s an d taillight s wil l flas h fo r abou t tw o minutes , o r unti l th e syste m is disarme d b y unlockin g eithe r
doo r fro m th e outsid e wit h th e key .
Doo r i s opene d forcibly .
Engin e compartmen t li d i s opened .
Trun k li d i s opene d withou t usin g th e key .
Hoo d is opened .
Roof i s unlatche d (NSX- T "ope n top") .
Flowchar t o f th e securit y alar m syste m operation : Batter
y terminal(s ) i s (are ) remove d an d reconnected .
Engin e starte r circui t an d batter y circui t ar e bypasse d
b y breakin g th e ignitio n switch .
Hood/engin e compartmen t lid/trun k li d opene r o r roo f
releas e leve r (NSX- T "ope n top" ) i n th e vehicl e i s
operated .
Remove th e ke y fro m th e ignitio n switc h
• Ignitio n ke y switc h OF F
Clos e al l th e doors , hood , engin e com -
partmen t lid , an d trun k lid . Th e roo f ca n
b e unlatche d o r latched .
NOTE : Bot h roo f loc k switche s hav e t o
b e in th e sam e position .
• Bot h doo r switche s OF F
• Engin e compartmen t li d switc h OF F
• Hoo d switc h OF F
• Trun k li d switc h OF F
• Bot h roo f loc k switche s OF F o r O N
(NSX- T "ope n top" )
Loc k th e driver' s o r passenger' s doo r fro m th e out -
sid e b y usin g th e key .
• Doo r loc k kno b switche s OF F
• Doo r ke y cylinde r switc h OF F
(PREARMED )
15 se c passed ?
The securit y alar m syste m is armed .
t o pag e 23-31 3 Th
e securit y alar m syste m is disarmed .
Doo r switc h (Driver/Passenger ) O N
Doo r loc k kno b switc h O N
Trun k li d switc h O N
Ignitio n ke y switc h O N
Onl y on e o r bot h roo f loc k switche s O N
(NSX- T "ope n top" ) Fro
m pag e ( 23-313 )
Indicato
r start s flashing .
1 se c O N / 1 se c OF F
ProCarManuals.com

From pag e 23-31 2
Indicato r flashes .
0.2 se c O N / 2. 4 se c OF F
Wan t th e syste m disarmed ?
(ARMED)
Trunk opene d b y key ?
Trun k li d switc h O N
Trun k ke y cylinde r switc h
Illegal activit y
1. Doo r i s opene d forcibly . o r
2 . Engin e compartmen t li d i s opened . o r
3. Trun k li d is opene d withou t usin g th e key . o r4. Hoo d is opened . o r
5 . Batter y terminal(s ) is(are ) disconnecte d
an d reconnected . o r
6. Engin e starte r circui t an d batter y circui t ar ebypasse d b y breakin g th e ignitio n switch . o r7. Hood/engin e compartmen t lid/trun k li d opene r o r roo f
releas e leve r (NSX- T "ope n top" ) i s operated . o r
8 . Stere o radio/cassett e playe r i s disconnected .
Alar m
The horn s soun d an d headlights , sid e marke r light s an dtaillight s flas h repeatedl y fo r tw o minutes .Engine starte r circui t interrupted .
About tw o minute s passed ?Want th e syste m disarmed ?
Either doo r i s unlocke d b y usin g th e key .
• Eithe r doo r ke y cylinde r switc h
Th e securit y alar m syste m is disarmed .
Indicato r stop s flashing . (T
o pag e
23-312 )
Rear m th e securit y alar m system ?
ProCarManuals.com

Engine Compartment Lid Switch

Test

1. Open the engine compartment lid.

2. Disconnect the 2-P connector from the engine

compartment lid switch.

3. Check continuity at the switch connector terminals.

• There should be continuity between the terminals

with the lever released (lid open).

• There should be no continuity with the lever

pushed down (lid closed).

LEVER

View from

terminal side
2-P CONNECTOR
Hood Switch Test

1. Open the hood.

2. Disconnect the 2-P connector from the hood

switch.

3. Check continuity at switch connector terminals.

• There should be continuity between the terminals

with the lever released (hood open).

• There should be no continuity with the lever

pushed down (hood closed).

LEVER

2-P CONNECTOR

View from

terminal sideProCarManuals.com