1991 ACURA NSX fuse

Under-Dash Fuse Box

Removal/Installation

CAUTION;

Be sure to install the SRS wiring so that it is not

pinched or interfering with other car parts.

Always keep the short connector on the airbag con-

nector when the harness is disconnected.

Removal:

1. Disconnect both the negative cable and positive ca-

ble from the battery.

2. Remove the maintenance lid A below the airbag,

then remove the short connector.

SHORT CONNECTOR

MAINTENANCE LID A

3. Disconnect the connector between the airbag and

cable reel.

4. Connect the short connector to the airbag side of

the connector.

STEERING WHEEL

AIRBAG CONNECTOR

CABLE REEL CONNECTOR

SHORT CONNECTOR (RED)
5. Remove the door sill molding.

6. Remove the kick panel trim pieces, as necessary.

7. Remove the under-dash fuse box mounting bolts.

8. Disconnect the under-dash fuse box connectors.

NOTE: The SRS main harness connector is double

locked. To remove it, first lift the connector lid with

a thin screwdriver, then press the connector tab

down and pull the connector out.

9. Take out the under-dash fuse box.

TAB

SRS FUSE

No. 1 (10 A)

SRS MAIN HARNESS
KICK PANEL TRIM

LIDProCarManuals.com

Installation:

1. Install the under-dash fuse box.

KICK PANEL TRIM

2. Connect the connectors to the under-dash fuse box.

NOTE: To reinstall the SRS main harness connector,

push it into position until it clicks, then close the con-

nector lid.

3. Install the kick panel trim pieces.

4. Disconnect the short connector from the airbag.

SHORT

CONNECTOR

(RED)

MAINTENANCE

LID A

CABLE REEL

CONNECTOR

AIRBAG CONNECTOR

SHORT CONNECTOR
5. Connect the airbag 2-P connector and cable reel 2-P

connector.

6. Attach the short connector to the lid A and attach

to the steering wheel.

7. Connect both the negative cable and positive cable

to the battery.

8. After installing the under-dash fuse box, confirm that

all systems work properly.ProCarManuals.com

— Defective gauge assemble, check for the A21
Speed Sensor Input Test

NOTE
:
Check the No. 2 (15 A) fuse in the under-dash


fuse box, before testing.
1. Disconnect the 3-P connector from the speed sensor.

View from

terminal side

SPEED SENSOR

3-P CONNECTOR

2. Check for continuity between the BLK terminal and the body ground.
There should be continuity. If there is no continuity, check for:
— An open in the BLk wire.
— Poor ground (G101) If there is continuity, go to step 3.
3. Check for vortage between the BLK/YEL terminal and the body ground with the ignition switch ON.
There should be battery voltage. If there is no voltage, check for an open in the
BLK/YEL wire. If there is battery voltage, go to step 4.
4. Check for voltage between the YEL/RED terminal and

bod
y
ground with the ignition switch ON.

There should be approximately 5 V.
If there is no voltage, check for:
terminal of the A connector (see page 23-121). If there are approximately 5 V, go to step 5.
5. If all continuity and voltage tests are normal, but the speedometer and the odo/trip meter do not operate,
replace the speed sensor.
Replacement

1. Disconnect the 3-P connector from the speed sensor.
2. Remove the mounting bolts and the speed sensor,
then take out the speed sensor assembly.

DRIVE LINK
3-P CONNECTOR

3. Install in the reverse order of removal. NOTE: Be careful not to lose the drive link, because
it is a tiny part.

BLK

YEL/RED

BLK/YEL
SPEED SENSOR
COVER

MOUNTING BOLTSProCarManuals.com

Integrated Control Unit
Input Test
CAUTION: All SRS electrical wiring harnesses are covered with
yellow outer insulation.Before disconnecting the SRS wire harness, install
the short connector on the airbag (see page 23-323). Replace the entire affected SRS harness assembly
if it has an open circuit or damaged wiring.
Remove the left side kick panel cover, and the dash re-
lay holder from the bracket, to disconnect the 16-P con-

nector from the integrated control unit.

Remove the integrated control unit from the dash fuse box.

Make the following input tests at the connector ter-

manals. If all tests prove OK, yet the system still falls

to work, replace the control unit.

NOTE: Several different wires have the same color. They
have been given a number suffix to distinguish them (for
example YEL and YEL are not the same).
SRS MAIN WIRE HARNESS
INTEGRATED
CONTROL UNIT
16-P CONNECTOR
UNDER-DASH FUSE BOX Not used

View from wire sideProCarManuals.com

Glove Box Light

Replacement/Test

1. Remove the glove box lower panel.

2. Remove the 8 screws then pull out the glove box.

3. Disconnect the 2-P connectors then remove the

glove box.

GLOVE BOX LOWER

PANEL
4. Remove the 2 screws from the glove box light.

GLOVE BOX

LIGHT

BULB (3.4W)

5. There should be continuity between the A terminal

and B terminal with a bulb installed. There should

be no continuity when the switch is pushed.

From FUSE

No.38 (15 A)

GLOVE BOX

LID

To GROUND

(401, G402)ProCarManuals.com

CAUTION:
All SRS electrical wiring harnesses are covered with
yellow outer insulation.
Before disconnecting the SRS wire harness, install
the short connector on the airbag (see page 23-323). Replace the entire affected SRS harness assembly
if it has an open circuit or damaged wiring.

SRS MAIN WIRE HARNESS

DEFOGGER SWITCH
Removal, page 23-273

Test, page 23-275

REAR WINDOW DEFOGGER

Function Test, page 23-288

UNDER-DASH FUSE BOX
INTEGRATED

CONTROL UNIT
DEFOGGER

RELAY
ENGINE COMPARTMENT FUSE/RELAY BOX
Description Function:

The rear window defogger is controlled by the integrated control unit.

When the defogger switch in the combination switch is pushed, it sends a signal to the defogger timer in the integrated

contro
l
unit and the defogger stays on for 25 minutes or until the ignition swi\
tch is switched off.

The indicator light in the switch shows when the defogger is on.

Rear Window Defogger
Component
Location Index
ProCarManuals.com

Troubleshooting

NOTE:

The numbers in the table show the troubleshooting sequence.

Before troubleshooting.

Check the No. 5 (10A) fuse in the under-dash fuse box, and the No. 29 (50A), No. 45 (20A) fuses in the under-

hood fuse/relay box.

Check that the horns sound.

Check the tachometer for proper operation.ProCarManuals.com