fuse ACURA NSX 1991 Service Owner's Manual

Component Location s
ENGINE CONTRO L MODUL E (ECM )
ABS CONTRO L UNI T
UNDER-HOO D
FUSE/RELA Y BO X
RIGHT-FRON T
WHEE L SENSO R RIGHT-REA
R WHEE L SENSO R
TRANSMISSIO N CONTRO L MODUL E (TCM )
THROTTL E BOD Y
THROTTL E ACTUATO R
LEFT-REARWHEEL SENSO R
TC S SWITC H
LEFT-FRON T
WHEE L SENSO R
TCS CONTRO L UNI T
LATERAL ACCELERATION (Lg) SENSOR
A/T GEA R POSITIO N SWITC H
UNDER-DAS H FUS E BO X
GAUG E ASSEMBL Y UNDER-HOO
D FUSE/RELA Y BO X
BRAK E LIGHTS/HOR N (2 0 A ) FUS E
TC S INDICATO R LIGH T
I G S W (A ) (5 0 A ) FUS E
UNDER-DAS H FUS E BO X CLOC
K (7. 5 A ) FUS E
BACK-U P LIGHTS/ALTERNATOR /
TUR N SIGNAL S (1 5 A ) FUS E
STEERIN
G ANGL E SENSO R
ProCarManuals.com

NOTE:
• Th e TC S contro l uni t ha s thre e memor y registers . Whe n a proble m occurs , th e contro l uni t store s th e Diagnosti c
Troubl e Cod e (DTC ) i n th e firs t memor y register . I f anothe r proble m occurs , o r th e sam e proble m occur s again , th e con -
tro l uni t move s th e firs t cod e t o th e nex t memor y registe r an d store s th e secon d cod e i n th e firs t register . I f there' s a
thir d proble m occurrence , th e tw o existin g cod e ar e move d u p on e registe r an d th e thir d cod e is store d in th e firs t reg -
ister . I f problem s continu e t o occur , th e oldes t cod e is move d ou t o f th e las t registe r an d lost , an d th e mos t recen t cod e
i s store d in th e firs t register .
• Th e TC S indicato r ligh t wil l no t com e o n agai n afte r th e engin e start s unles s anothe r proble m occurrenc e is detected .
However , ther e wil l stil l b e a cod e store d in th e contro l unit' s memory .
• Afte r th e repai r i s completed , disconnec t th e SC S servic e connecto r fro m th e Servic e Chec k connector , an d remov e th e
CLOC K (7. 5 A ) fus e fro m th e under-hoo d fuse/rela y bo x fo r a t leas t thre e second s to eras e th e contro l unit' s memory .
• Th e contro l unit' s memor y i s erase d i f th e connecto r i s disconnecte d fro m th e contro l uni t o r i f th e contro l uni t i s
remove d fro m th e car .
ProCarManuals.com

Headliner/lnterior Trim

Replacement

To remove the headliner, first remove the: Sunvisors
Center pillar trim panels

Front pillar trim panels

Seats (see page 20-39('93-'96)

Ceiling light (see section 23)

NOTE:
When installing the headliner, be careful not to fold
or bend it. Also, be careful not to scratch the body.
Check that both sides of the headliner are securely

attached to the trim.

Disassemble in numbered sequence.
NOTE: When removing the rear trim panels, take care not to

damage the control units and relays.

Take care not to scratch the trim panels.

Clip Locations
CENTER PILLAR

TRIM PANEL

FRONT PILLAR
TRIM PANEL
DOOR TRIM
SIDE SILL

PAD

SIDE SILL

TRIM

REAR SIDE TRIM PANEL
CENTER ARMREST
Replacement, see page

20-49

OPENER
KNOB
SIDE SILL

TRIM

UNDER-DASH FUSE BOX LID

Installation is the reverse of the removal procedure.
NOTE: If necessary, replace any damaged clips.
RELEASE

HANDLE

Replacement,

see page 20-68
REAR SIDE TRIM PANEL CLIP
SIDE SILL

PAD
LEFT REAR TRIM PANEL

CLIP

REAR UPPER TRIM PANEL REAR CENTER
TRIM PANEL

GUIDE PIN

RIGHT REAR TRIM
PANEL LEFT SUNVISOR
CENTER SUNVISOR

RIGHT SUNVISOR

HEADLINERProCarManuals.com

Carpet

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 service.

DASHBOARD

INSIDE SCREW
CARPET

HOOK

(3)

AIR VENT
AM VENT

AIR DUCT
CUPS

FLOOR

CARPET

CONSOLE

CARPET

CONSOLE CARPET

SRS UNIT
SCREW

(cont'd)

1. Remove:
Seats (see page 20-39('93-'96), 38('91-'92)

Footrest

Under-dash fuse box lid (see page 20-38('93-'96),37('91-'92)

Side sill trim (see page 20-38 ('93-'96), 37('91-'92)

Side sill pad (see page 20-38('93-'96), 37('91-'92)
Rear side trim panel (see page 20-38('93-'96), 37('91-'92)

Center armrest (see page 20-49('94-'96)('91-'93)

Center console panel (see page 20-52('94-'96)('91-'93)


2. Detach the clips at The front edge (passenger's).
3. Remove the console carpet attaching screw from the heater unit (passenger's).
4. Disconnect the air duct (driver's) and air vent, then remove the carpet hooks from the dashboard inside screws.ProCarManuals.com

SRS components are located in this area. Review the SRS component locations, precautions, and procedures in the SRS

section 24 before performing repairs or service.

POWER TRANSISTORBLOWER MOTOR

RECIRCULATION

CONTROL
MOTOR

CONDENSER
FAN MOTOR UNDER-HOOD RELAY BOX A
(CONDENSER FAN RELAY, COMPRESSOR CLUTCH RELAY,
BLOWER MOTOR HIGH RELAY, BLOWER MOTOR RELAY)
UNDER-HOOD

FUSE/RELAY

BOX

HEATER CORE TEMPERATURE SENSOR
CLIMATE CONTROL UNIT VENT DOOR
CONTROL MOTOR
OUTSIDE AIR
TEMPERATURE SENSOR ENGINE COMPARTMENT

FUSE/RELAY BOX
A/C TRIPLE PRESSURE SWITCH
FAN CONTROL UNIT (Fan radiator and con-

denser fans inside car,

behind seats)
EVAPORATOR

TEMPERATURE

SENSOR

IN-CAR

TEMPERATURE
SENSOR
MODE CONTROL

MOTOR

AIR MIX CONTROL MOTOR
SUNLIGHT

SENSORProCarManuals.com

Troubleshooting

Tips and Precautions

Before Troubleshooting

• Check applicable fuses in the appropriate fuse box.

• Check the battery for damage, state of charge, and

clean and tight connections.

• Check the alternator belt tension.

CAUTION:

• Do not quick-charge a battery unless the battery

ground cable has been disconnected.

Otherwise you will damage the alternator

diodes.

• Do not attempt to crank the engine with the bat-

tery ground cable loosely connected or you will

severely damage the wiring.

Handling Connectors

• Make sure the connectors are clean and have no loose

wire terminals.

• Make sure multiple cavity connectors are packed with

grease (except watertight connectors).

• All connectors have push-down release type locks.

LOCKING TAB

Some connectors have a clip on their side used to at-

tach them to a mount bracket on the body or on

another component. This clip has a pull type lock.

Some mounted connectors cannot be disconnected

unless you first release the lock and remove the con-

nector from its bracket.

LOCKING

PAWL ON

OTHER

HALF OF

CONNECTOR
Pull to

disengage

BRACKET
• Never try to disconnect connectors by pulling on their

wires; pull on the connector halves instead.

• Always reinstall plastic covers.

• Before connecting connectors, make sure the ter-

minals are in place and not bent.

BENT TERMINAL

Check for loose retainer and rubber seals.

RETAINER
RUBBER SEAL RETAINER

• The backs of some connectors are packed with

grease. Add grease if needed. If the grease is con-

taminated, replace it.ProCarManuals.com

Five-step Troubleshooting

1. Verify The Complaint

Turn on all the components in the problem circuit to

verify the customer complaint. Note the symp-

toms. Do not begin disassembly or testing until you

have narrowed down the problem area.

2. Analyze The Schematic

Look up the schematic for the problem circuit.

Determine how the circuit is supposed to work by

tracing the current paths from the power feed

through the circuit components to ground. If

several circuits fail at the same time, the fuse or

ground is a likely cause.

Based on the symptoms and your understanding of

the circuit operation, identify one or more possible

causes of the problem.

3. Isolate The Problem By Testing The Circuit

Make circuit tests to check the diagnosis you made

in step 2. Keep in mind that a logical, simple pro-

cedure is the key to efficient troubleshooting. Test

for the most likely cause of failure first. Try to make

tests at points that are easily accessible.
4. Fix The Problem

Once the specific problem is identified, make the

repair. Be sure to use proper tools and safe

procedures.

5. Make Sure The Circuit Works

Turn on all components in the repaired circuit in all

modes to make sure you've fixed the entire pro-

blem. If the problem was a blown fuse, be sure to

test all of the circuits on that fuse. Make sure no

new problems turn up and the original problem

does not recur.ProCarManuals.com

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

Relay and Control Unit Locations

Dashboard

TURN SIGNAL/HAZARD

RELAY
CLIMATE CONTROL UNIT

UNDER-DASH FUSE BOX
FOOT WELL LIGHT

DASHBOARD

LOWER COVER

INTEGRATED

CONTROL UNIT
SRS UNITProCarManuals.com

Relay and Control Unit Locations

Engine Compartment

REAR WINDOW DEFOGGER

RELAY
ENGINE COMPARTMENT

FAN RELAY (A/T)

Wire colors: YEL/BLK,

BLU/RED, WHT/GRN,

and WHT/BLU

SPARK PLUG VOLTAGE

DETECTION MODULE
ENGINE COMPARTMENT

FUSE/RELAY BOX

IGNITION CONTROL

MODULE (ICM)ProCarManuals.com