1991 ACURA NSX light

5. Remove the four screws from the headlight switch.
HEADLIGHT SWITCH 10-P CONNECTOR
16-P CONNECTOR
6. Disconnect the 10-P connector from the turn signal cancel unit, then remove the headlight switch and
turn signal switch.
7. Separate the headlight switch from the turn signal switch.
8. If necessary, remove the turn signal cancel unit and cancel switch.
TURN SIGNAL CANCEL UNIT TURN SIGNAL
CANCEL SWITCH

HOUSING

BULB (0.91 W)
4. Remove the bulb from the switch by turning it 45°. 3. Slide the headlight switch out of the housing as
shown.
HEADLIGHT SWITCH
1. Remove the headlight switch (see previous page).
2. Remove the two screws. Headlight Switch Light Bulb

ReplacementProCarManuals.com

5. Remove the four screws from the headlight switch.
HEADLIGHT SWITCH 10-P CONNECTOR
16-P CONNECTOR
6. Disconnect the 10-P connector from the turn signal cancel unit, then remove the headlight switch and
turn signal switch.
7. Separate the headlight switch from the turn signal switch.
8. If necessary, remove the turn signal cancel unit and cancel switch.
TURN SIGNAL CANCEL UNIT TURN SIGNAL
CANCEL SWITCH

HOUSING

BULB (0.91 W)
4. Remove the bulb from the switch by turning it 45°. 3. Slide the headlight switch out of the housing as
shown.
HEADLIGHT SWITCH
1. Remove the headlight switch (see previous page).
2. Remove the two screws. Headlight Switch Light Bulb

ReplacementProCarManuals.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

Hazard Warning Switch Light Bulb

Replacement

1. Remove the steering column covers.
2. Remove the screws from the hazard warning and wiper switches.

HAZARD

WARNING SWITCH
3. Remove the two screws from the back of switch. HAZARD WARNING
SWITCH
4. Slide the hazard warning switch out of the housing
as shown.

5. Remove the bulb from the hazard warning switch by
turning it 45°.
HAZARD WARNING SWITCH
HOUSING BULB (0.91W) Hazard Warning Switch Test
1. Remove the dashboard lower cover (see page
23-126).

2. Disconnect the 18-P connector from the floor wire harness.
3. Check for continuity between the terminals in each
switch position according to the table.

HAZARD WARNING SWITCH
18-P CONNECTOR
View from wire side M: Not usedProCarManuals.com

Dash Lights Brightness Control

Component Location Index

TRANSMISSION
CONTROL MODULE (TCM)

HEADLIGHT RETRACTOR

SWITCH DASH LIGHTS BRIGHTNESS

CONTROLLER
Test
,
page 23-226

COMBINATION LIGHT SWITCH

Test
,
page 23-STET
Replacement
,
page 23-STET

DASH LIGHTS BRIGHTNESS
CONTROL UNIT

Inpu
t
Test, page 23-224
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

Switch Removal
CAUTION: All SRS wiring harnesses are covered with yellow
outer insulation. Before disconnecting any part of the SRS wire
harness, 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.
1. Remove the dashboard tower cover and disconnect
the connectors from the floor wire harness.

CONNECTORS
FOOT WELL LIGHT LIGHTS-ON

CHIME
DASHBOARD
LOWER COVER

2. Disconnect the 18-P connector from the floor wire
harness.
CAUTION: Be careful not to damage the SRS wire
harness.

BEAR WINDOW

DEFOGGER SWITCH
18-P
CONNECTOR

3.
Remove
the
tilt
cover.
TILT COVER
4. Remove the steering column lower cover and upper

cover.
UPPER COVER
LOWER COVER
NOTE: Be careful not to damage the steering column

covers.

5. Remove the four screws, then remove the rear win- dow defogger switch and windshield wiper/washer

switch assembly.
REAR WINDOW
DEFOGGER

SWITCH

WINDSHIELD WIPER/WASHER SWITCHProCarManuals.com