1991 ACURA NSX 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
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