1991 ACURA NSX relay

Radiator and Condenser Fan Controls
Component Location Index
UNDER HOOD RELAY BOX A
RADIATOR FAN
RESISTOR

Test, page 23-116

RIGHT CONDENSER
FAN MOTOR
Test, page 23-117
Replacement, see section 22
RADIATOR FAN MOTOR
Test, page 23-117Replacement, see section 5 LEFT CONDENSER FAN
MOTOR
Test, page 23-117

Replacement, see section 22
A/C TRIPLE PRESSURE
SWITCH

See, section 22

CLIMATE CONTROL UNIT

Troubleshooting, see section 22

RADIATOR FAN

LOW RELAY

Wire colors: WHT/BLU,
YEL/BLK, RED and GRN/BLK
RADIATOR FAN
HIGH RELAY

Wire colors: WHT/BLU
BLK, YEL/BLK and BLU/RED
CONDENSER FAN RELAY
Wire colors: WHT/GRN, BLK,
YEL/BLK and ORN/BLUProCarManuals.com

ECM

RADIATOR FAN CONTROL SENSOR

Test, page 23-120
ENGINE COMPARTMENT FAN MOTOR

Test, page 23-118
Replacement, page 23-118
ENGINE COMPARTMENT

FAN RELAY

Wire colors: YEL/BLU
BLK/YEL, WHT/RED,
and WHT/BLU

Test, page 23-119

FAN CONTROL

UNITProCarManuals.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

Side Marker/Turn Signal/Hazard Flash System

Turn Signal/Hazard Relay Input Test

1. Remove the dashboard lower cover. Remove the turn signal/hazard relay from the left kick panel, then dis-
connect the 6-P connector.
2. Inspect the connector terminals to be sure they are all making good contact.
If the terminals are bent, loose or corroded, repair
them as necessary, and recheck the system.
If the terminals look OK, make the following in-
put tests at the connector. If any test indicates a problem, find and cor-
rect the cause, then recheck the system. If all the input tests prove OK, the control unit
must be faulty; replace it.
View from
wire side
TURN/SIGNAL

HAZARD RELAY

1

2

3

4
5

6
B

(RED/WHT)

SR

(BLU/YEL)

SL

(BLU/GRN)

SR

(BLU/YEL)

SL

(BLU/GRN)

LR

(GRN/YEL)

LL

(GRN/BLU)
Test condition
Under all conditions.

Ignition switch ON

and turn signal
switch in right position.

Ignition switch ON

and turn signal switch in left
position.
Connect the B termi-

nal to the LR

terminal.
Connect the B termi-

nal to the LL

terminal.
Test: Desired result
Check for continuity to ground:
There should be continuity.
Check for voltage to ground:
There should be battery voltage.
Check for voltage to ground:
There should be battery voltage.
Check for voltage to ground:
There should be battery voltage.
Right turn signal lights should come

on.

Left turn signal lights should come

on.
Possible cause if result is not obtained
Poor ground (G401, G402).
An open in the wire.
Blown No. 46 (10 A) fuse.
An open in the wire.
Blown No. 5 (10 A) fuse.
Faulty turn signal switch or cancel

unit.

An open in the wire.
Faulty hazard warning switch.
An open in the wire.
Blown bulb.
Faulty side marker flasher circuit.
Poor ground (G301, G401, G402,

G551).

An open in the wire.
Blown bulb.
Faulty side marker flasher circuit.
Poor ground (G301, G401, G402,

G551).

An open in the wire.

E

(BLK)

Terminal

No.

Under all conditions.
Hazard warning
switch ON.ProCarManuals.com

Cancel Unit Input Test
1. Remove the steering column covers. Disconnect the 10-P connector from the turn signal cancel unit.
2. Inspect the connector terminals to be sure they are all making good contact.
If the terminals are bent, loose or corroded, repair
them as necessary, and recheck the system.
If the terminals look OK, make the following in-
put tests at the connector. If any test indicates a problem, find and cor-
rect the cause, then recheck the system. If all the input tests prove OK, the control unit
must be faulty; replace it.
C9 (GRN/BLK)

C10
(BLK)
10-P CONNECTOR

TURN SIGNAL

CANCEL UNIT

C7 (BLU/YEL)
C5
(PUR)
C3(ORN)
C1
(YEL)

View

from

wire

side

C2
(BRN)

C4
(WHT)

C6
(GRY)
C8 (BLU/GRN)

Test condition
Under all conditions.

Ignition switch ON.

Headlight switch
Turn signal switch in right position.
Turn signal switch in
left position.
Under all conditions.
Connect the C1
terminal to the C7
terminal, then turn

the ignition switch
ON.

Connect the C1
terminal to the C8
terminal, then turn

the ignition switch

ON.
Test: Desired result
Check for continuity to ground:
There should be continuity.
Check for voltage to ground:
There should be battery voltage.
Check for voltage to ground:
There should be battery voltage.
Check for continuity between the
C2 and C6 terminals:
There should be continuity.
Check for continuity between the
C2 and C9 terminals:
There should be continuity.
Check for continuity between the
C3 and C4 terminals:
There should be continuity.
Right turn signal lights should come

on.

Left turn signal lights should come

on.
Possible cause if result is not obtained
Poor ground (G401, G402).
An open in the wire.
Blown No. 5 (10 A) fuse.
An open in the wire.
Faulty headlight switch or taillight

relay.

An open in the wire.
Faulty turn signal switch.
An open in the wire.
Faulty turn signal switch.
An open in the wire.
Faulty cancel solenoid.
An open in the wire.
Blown bulb.
Faulty turn signal/hazard relay.
Poor ground (G301, G401, G402,

G551).

An open in the wire.
Blown bulb.
Faulty turn signal/hazard relay.
Poor ground (G301, G401, G402,

G551).

An open in the wire.

No.


Terminal

C10

(BLK)

1

2

C1

(YEL)

C5

(PUR)

3

4


C2

(BRN)

C6

(GRY)

5

C2

(BRN)
C9

(GRN/BLK)

6

C3

(ORN)

C4

(WHT)

7

C7

(BLU/YEL)

C8

(BLU/GRN)ProCarManuals.com

Rear Window Defogger
Component Location Index

CAUTION:
Al
l
SRS wiring harnesses are covered with yellow
outer insulation.
Befor
e
disconnecting any part of the SRS wire
harness

,
install the short connectors (see page

24-10).

Replac
e
the entire affected SRS harness assembly if

it
has an open circuit or damaged wiring.
REA
R
WINDOW DEFOGGERTIME
R
CIRCUIT(I
n
the integrated control unit)

SRS MAIN

HARNESS

REA
R
WINDOWDEFOGGE
R
SWITCHRemoval
,
page 23-277


Test, page 23-279

REAR WINDOW DEFOGGER

Functio
n
Test, page 23-288

UNDER-DASH FUSE BOX

REA
R
WINDOWOEFOGGE
R
REALV


Test, page 23-278

ENGIN
E
COMPARTMENT


FUSE/RELAY BOX

Description
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 control unit and the defogger stays on for 25

(40 minutes for Canada models) minutes or until the ignition switch is turned off.
The indicator light in the switch shows when the defogger is on.ProCarManuals.com

Rear Window Defogger
Switch Light Bulb Replacement
1. Remove the steering column lower and upper covers.
2. Remove the four screws from the combination
switch.

3. Remove the rear window defogger switch (see previous page).
4. Remove the rear window defogger switch bulbs.

BULBS (0.91 W)
REAR WINDOW
DEFOGGER SWITCH Relay Test
1. Remove the defogger relay in the engine compart- ment fuse/relay box.
2. There should be continuity between the C and D terminals.
3. There should be continuity between the A and B terminals when power and ground are connected to

the C and D terminals.

There should be no continuity when power isdisconnected.ProCarManuals.com

Troubleshooting

NOTE: The numbers in the table show the troubleshooting sequence.

Intermittent Wiper Relay Test

1. Remove the wiper intermittent relay from the

under-hood relay box B.

2. There should be continuity between the A and C

terminals when power and ground are connected to

the E and F terminals.

There should be continuity between the B and C

terminals when power is disconnected.ProCarManuals.com