1991 ACURA NSX fuse box

Charging System

Troubleshooting

Alternator/Regulator Test

Use the SUN VAT-40 (or equivalent) tester.
2. Attach the negative tester cable and the voltmeter

negative lead to the top of the intake manifold.

LOAD ADJUSTER

(CARBON PILE)
FULL FIELD

LEAD (BLU)

VOLTMETER

NEGATIVE

LEAD (BLK)

VOLT

SELECTOR

FIELD

SELECTOR

INDUCTIVE

PICK-UP

(GRN)
POSITIVE

CABLE (RED)
NEGATIVE

CABLE (BLK)
VOLTMETER

POSITIVE

LEAD (RED)

1. Attach the positive tester cable and the voltmeter

positive lead to the jump start terminal in the

engine compartment fuse/relay box.

POSITIVE CABLE

VOLTMETER

POSITIVE LEAD

JUMP

START

TERMINAL

- ENGINE COMPARTMENT

FUSE/RELAY BOX
VOLTMETER

NEGATIVE LEAD
NEGATIVE CABLE

NEGATIVE MARK

3. Attach the inductive pick-up to the B terminal wire

of the alternator with its arrow pointing away from

the terminal.

NOTE: The arrow must point away from the B

terminal.

INDUCTIVE PICK-UP

ARROW
ALTERNATOR

B TERMINAL

ALTERNATOR
TEST SELECTOR

SWITCHProCarManuals.com

NOTE: A shor t t o groun d i n th e OR N wir e ca n b e cause d b y a shor t i n an y componen t connecte d t o it .
Vehicl e Spee d Senso r (VSS ) Tes t
Speedomete r doe s no t work.
Inspec t No . 5 (1 5 A ) fus e in th e
under-das h fus e bo x befor e
testing .
Disconnec t th e 3- P connecto r
fro m th e VSS .
Turn th e ignitio n switc h O N (II) .
Measur e voltag e betwee n th e YE L
wir e termina l an d th e BL K wir e
termina l i n th e harnes s sid e o f th e
3- P connector .
I s ther e batter y voltage ?
Measur e voltag e betwee n th e
OR N an d th e BL K wir e terminals .
I s ther e abou t 5 V ?
(T o page 23-132 ) Vie
w fro m
termina l sid e
, BL K 3- P CONNECTO R
VSS
Is ther e continuity ?
Repai r ope n in th e OR N wir e o r
shor t t o bod y ground .Repair ope n betwee nthe VS S an d groun dG101.
Repai r ope n in th e YE L wir e be -
twee n th e VS S an d under-das h
fuse box .
Chec k fo r continuit y betwee n th eBLK termina l an d bod y ground .
ProCarManuals.com

UNDER-HOOD FUSE/RELAY BOX
UNDER-HOOD RELAY BOX A
DIMMER RELAY
Test, page 23-189
TAILLIGHT RELAYTest, page 23-190
('94-'96) ('91-'93) LEFT HEADLIGHT

RETRACTOR CUT RELAY

Test page 23-190 ('94-'96) ('91-'93)
RIGHT HEADLIGHTRETRACTOR CUT RELAYTest, page 23-190 ('94-'96) ('91-'93)
HEADLIGHT RELAY
Test, page 23-189
RIGHT HEADLIGHT

RETRACTOR RELAY

Test page 23-190
('94-'96) ('91-'93)
RIGHT HEADLIGHT
RETRACTOR MOTOR
Test, page 23-188
Replacement, page

23-186

RIGHT DAYTIME RUNNING
LIGHT (Canada)
Replacement, page, 23-194 HEADLIGHTS

Adjustment, page 23-192

Replacement page 23-163

LEFT DAYTIME RUNNING LIGHT (Canada)
Replacement, page 23-194
LEFT HEADLIGHT
RETRACTOR MOTOR
Test, page 23-186 Replacement, page 23-186 LEFT HEADLIGHT

RETRACTOR RELAY

Test, page 23-190
('94-'96) ('91-'93)ProCarManuals.com

Lighting System

Retractor Motor Replacement

CAUTION:

• Halogen headlights can become very hot in use; do

not touch them or the attaching hardware immediately

after they have been turned off.

• Do not try to replace or clean headlights with the lights

on.

1. Remove the No. 42 (15 A) and No. 43 (15 A) fuses

from the under-hood fuse/relay box.

No. 43
(15A)

FUSE

No. 42
(15A)

FUSE

UNDER-HOOD FUSE/RELAY BOX

2. Turn the knob clockwise to raise the headlight.

CAP

KNOB
3. Remove the two caps, four screws, and cowl clips.

COWL CLIP

CAP

SCREW

4. Slide the headlight housing forward and up.

NOTE: Be careful not to damage the front bumper

or the headlight housing.

HEADLIGHT HOUSING

PROTECTIVE TAPE

5. Disconnect the 6-P connector from the headlight

unit.

6-P CONNECTOR

HEADLIGHT UNIT

6. Remove the four mounting bolts, then remove the

unit.
MOUNTING

BOLTSProCarManuals.com

Headlight Relay Test

1. Remove the headlight relay from the under-hood

fuse/relay box.

2. Check continuity at the relay terminals.

• There should be continuity between the C and D

terminals.

• There should be continuity between the A and B

terminals when power and ground are connect-

ed to the C and D terminals.

• There should be no continuity between the A and

B terminals when power is disconnected.
Dimmer Relay Test

1. Remove the dimmer relay from the under-hood

fuse/relay box.

2. Check continuity at the relay terminals.

• There should be continuity between the F and E

terminals and between the B and C terminals.

• There should be continuity between the A and C

terminals when power and ground are connect-

ed to the E and F terminals.

• There should be no continuity between the A and

C terminals when power is disconnected.ProCarManuals.com

Headlight Replacement

CAUTION:

• Halogen headlights can become very hot in use; do

not touch them or the attaching hardware immediately

after they have been turned off.

• Do not try to replace or clean the headlights with the

lights on.

1. Remove the No. 42 (15 A) and No. 43 (15 A) fuses

from the under-hood fuse/relay box.

No. 43
(15A)

FUSE

No. 42
(15A)

FUSE

UNDER-HOOD FUSE/RELAY BOX

2. Remove the cap, and turn the knob clockwise to

raise the headlight.

CAP

RETRACTOR

KNOB
3. Remove the two caps, four screws, and cowl clips.

COWL CLIP

CAPS

SCREW

4. Slide the headlight housing forward and up to re-

move it. Be careful not to damage the bumper or the

housing.

HEADLIGHT HOUSING

PROTECTIVE TAPE

5. Disconnect the 6-P connector from the headlight

unit.

6-P CONNECTOR

MOUNTING

BOLTS

HEADLIGHT UNIT

6. Remove the four mounting bolts, then remove the

headlight unit.

7. After installing the new headlight, adjust both head-

lights to local requirements.ProCarManuals.com

(95-96 Models)
Glove Box Light

1
.
Remove the glove box lower panel.


GLOVE

BOX

GLOVE BOX LOWER
PANEL

2
.
Remove the eight screws, then pull out the glove
box
.

3
.
Disconnect the 2-P connectors, then remove theglov

e
box.

4. Remove the two screws from the glove box light.

BULB

(3.4
W)

5. Check for continuity between the A terminal and B
terminal with a bulb installed. There should be con-
tinuity. There should be no continuity when the
switch plunger is pushed.

GLOVE BOX

LID
From

No.38 (15A ) FUSE

G401
G402

G403

Replacement/Test

GLOVE
BOX

LID
GLOVE BOX LIGHT
(3.4W)ProCarManuals.com

Back-up Lights
Component Location Index

A/T GEAR POSITION SWITCH
(Back-u
p
light switch)

Test, page 23-160 ('93-'96) ('91-'92).

UNDER-DASH

FUSE BOX BACK-UP LIGHT SWITCH (M/T)

Test, page 23-208 ('93-'96) ('91-'92).

BACK-UP LIGHTS

Bulb replacement, page 23-206ProCarManuals.com