ACURA NSX 1991 Service Repair Manual

View from the back of the gauge assembly.
PRINTED CIRCUIT

BOARD A
BOARD-TO-BOARD CONNECTOR
PRINTED

CIRCUIT BOARD B
NOTE: The number in the table show the troubleshooting sequence.
Speedometer/Trip meter/Odometer

TroubleshootingProCarManuals.com

NOTE: A short to ground in the ORN wire can be caused by a short in any component connected to it.

Vehicle Speed Sensor (VSS) Test
Speedometer does not work.

Inspect No. 2 (15 A) fuse in theunder-dash fuse box before

testing.

Disconnect the 3-P connector at

the
VSS.

Turn the ignition switch ON.

Measure voltage between the
BLK/YEL wire terminal and the
BLK wire terminal in the harness
side of the 3-P connector. Is there battery voltage?
Measure voltage between the
YEL/RED and the BLK wire ter-
minals.
Is there about 5 V?(To next page) Repair open in YEL/RED wire or
short to body ground. View from
terminal side

3-P CONNECTOR

VSS

BLK

Is there continuity?

Repair open BLK/YEL wire, be-

tween the VSS and under-dash
fuse box. Check for continuity between the
BLK terminal and body ground.
Repair open between
the VSS and ground
G101.

(cont'd)ProCarManuals.com

Speedometer/Trip Meter/Odometer
Troubleshooting (cont'd)
(From previous page)
Reconnect the 3-P connector at
the vehicle speed sensor (VSS).

Raise the rear of the car and sup-

port it with stands.

Back-probe the YEL/RED wire and

connect it to body ground through a voltmeter.

Put the car in neutral with key ON.

Slowly rotate one wheel with the
other wheel blocked. Does voltage pulse from 0 to about 12 V?
Disconnect the 30-P connector at
the speedometer.

Back-probe the YEL/RED wire and

connect it to body ground through a voltmeter.
Slowly rotate one wheel with the
other wheel blocked.
Does the volt meter indicate pulsing voltage?

Replace the speedometer.
Repair open in the YEL/RED wire,

between the VSS and the

speedometer.
Replace the VSS (see page

23-133).ProCarManuals.com

Blown No. 5 (10 A) fuse
(In the under-dash fuse box)
Blown No. 34 (15 A) fuse
(In the under-dash fuse box)
Safety indicator input
Safety indicator (Diodes)Brake light failure sensorDoor switch
Trunk latch switch
Retractable headlight control unit
(see page 23-174)
Poor ground
Open circuit, loose or disconnected
terminalsProCarManuals.com

A/T Gear Position Indicator

CAUTION:
• All SRS wiring harnesses are covered with yellow out-
er insulation.

• Before disconnecting any part of the SRS wire har-
ness, install the short connectors (see page 24-10 ('93-'96))
• Replace the entire affected SRS harness assembly if it has an open circuit or damaged wiring.
• After installing the gauge assembly, recheck the oper-
ation of the SRS Indicator light.
CONNECTOR "A" (Carrios the SRS Indicator signal)

SRS MAIN

HARNESS
A/T GEAR POSITION

INDICATOR

Input Test, page 23-154 ('91-'93)

TRANSMISSION

CONTROL MODULE (TCM)

See Automatic transmission

section 14

AfT GEAR POSITION

SWITCH

Test, page 23-160
Replacement, page 23-161

Component Location IndexProCarManuals.com

— If all the input tests prove OK, the control unit must
CAUTION:
All SRS wiring harnesses are covered with yellow out-
er insulation.
Before disconnecting any part of the SRS wire hap

ness, install the short connectors (see page 24-10('93-'96))

Replace the entire affected SRS harness assembly if
it has an open circuit or damaged wiring.

Afte
r
installing the gauge assembly, recheck the oper-


ation of the SRS indicator light.
Remove the dashboard lower cover, center panel and
instrument panel. Disconnect the connector "B"
OOP) from the gauge assembly (see page 23-127).
Inspect the connector terminals to be sure they are
all making good contact.

I
f
the terminals are bent, loose, or corroded, repair

them as necessary, and recheck the system.
If the terminals look OK, make the following input tests
at the connector.
— If a test indicates a problem, find and correct the cause, then recheck the system.
be faulty; replace it.
CONNECTOR "A" (Carries the SRS indicator signal)

SRS MAIN

HARNESS

CONNECTOR "A'

YEL

RED/ELK

GRN/YEL

LT BLU
View from wire side

CONNECTOR "B"

BLK

RED


LT GRN

LT GRN/WHT

YEL/BLU
GRY/WHT
GRN

YEL/BLK
BRN/BLK

A/T Gear Position Indicator
Indicator Input TestProCarManuals.com

ProCarManuals.com

Lighting System
Component Location Index
RETRACTABL
E
HEADLIGHTCONTRO
L
UNITInpu
t
Test,pag
e
23-174
DAYTIM

E
RUNNING LIGHTS
CONTRO
L
UNIT (Canada)
Test
,
page 23-176
SECURIT

Y
CONTROL UNITInpu
t
Test, page 23-312
HIG
H
BEAM INDICATOR LIGHT(I
n
the gauge assembly)Gaug
e
Assembly, page 23-121

COMBINATION

LIGHT SWITCH

Test
,
page 23-177
Replacement
,
page 23-178
ProCarManuals.com

UNDER HOOD FUSE/RELAY BOX
DIMME
R
RELAY


Test, page 23-189
UNDER-HOOD RELAY BOX A

TAILLKSHT RELAY

Test, page 23-190

HEADLIGHT RELAY

Test, page 23-189
RIGHT HEADLIGHT

RETRACTOR RELAY

Test, page 23-190
RIGHT HEADLIGHT

RETRACTOR MOTOR

Test, page 23-188

Replacement, page
23-186

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

HEADLIGHTS
Ajustment, page 23-192

Replacement, page 23-193
LEFT DAYTIME RUNNING LIGHT (Canada)

Replacement
,
page 23-194

LEFT HEADLIGHT

RETRACTOR MOTOR

Test, page 23-188
Replacement, page 23-186 LEFT HEADLIGHT

RETRACTOR RELAY

Test
,
page 23-190

LEFT HEADLIGHT

RETRACTOR CUT RELAY

Test, page 23-190
RIGHT HEADLIGHT

RETRACTOR CUT RELAY

Test, page 23-190ProCarManuals.com

Lighting System
Headlight/Turn Signal Switch Replacement

CAUTION:
All SRS wiring harnesses are covered with yellow out-
e
r
insulation.

Before disconnecting any part of the SRS wire har-
ness, install the short connectors (page 24-10('93-'96)). Replace the entire affected SRS harness assembly If
ft has an open circuit or damaged wiring.

SRS MAIN

HARNESS

1. Remove the knee bolster pad.

KNEE BOLSTER PAD

2.
Remove
the
tilt
cover.

TILT COVER

16-P CONNECTOR

10-P

CONNECTOR

4. Disconnect the 16-P connector and 10-P connector.

LOWER COVERUPPER COVER

3. Remove the steering column lower cover and upper
cover.ProCarManuals.com