ACURA NSX 1991 Service Repair Manual

Lighting System
Retractable Headlight Control Unit Input Test
Remove the rear bulkhead panels and disconnect the 18-P connector from the control unit.
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 input
tests at the connector.
If any test indicates a problem, find and correct
the cause, then recheck the system.
If all the input tests prove OK, the control unit
must be faulty; replace it.
NOTE: Different wires with the same color have
been given a number suffix to distinguish them

(for example, RED/YEL1 and RED/YEL4 are not

the same). REAR BULKHEAD
RETRACTABLE HEADLIGHT
CONTROL UNIT
View fromwire side

RED/GRN2

PNK/BLK

LT GRN/RED
YEL/WHT

YEL

YEL/BLU

YEL/GRN
WHT/YEL
GRN/WHT1

RED/YEL1

18-P CONNECTOR
BLU1

BLU/RED

BLK1

WHT/GRN
BLK2

RED/YEL4ProCarManuals.com

ProCarManuals.com

Lighting System

Daytime Running Lights Control Unit Input Test (Canada)

Remove the glove box lower panel and glove box.Dis-

connect the 4-P and 8-P connectors from the daytime

running lights control unit.

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 input tests

at the connector.

If any test indicates a problem, find and correct the

cause, then recheck the system.

If all the input tests prove OK, the control unit must

be faulty; replace it.

4-P CONNECTOR
DAYTIME RUNNING LIGHTS

CONTROL UNIT (Canada)

8-P CONNECTOR

View from wire side

GRN/YEL

GRN/REDProCarManuals.com

Combination Light /Turn Signal Switch Test

16-P CONNECTOR
1. Remove the dashboard lower cover and knee bolster

pad.

2. If necessary, remove the knee bolster.

3. Disconnect the 16-P connector from the floor wire

harness.

4. Check for continuity between the terminals, in each

switch position according to the table.

View from wire side

Turn Signal Switch
Headlight/Dimmer/Passing SwitchProCarManuals.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

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

Side Marker/Turn Signal/Hazard Flasher System
Hazard Warning Switch Removal
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) Replace the entire affected SRS harness assembly if
it ha* an open circuit or damaged wiring.

1. Remove the dashboard lower cover and disconnect
the connectors from the floor wire harness.

CONNECTORS

DASHBOARD
LOWER COVER

2. Disconnect the 18-P connector from the floor wire
harness.
HAZARD WARNING

SWITCH

18-P

CONNECTOR

3.
Remove
the
tilt
cover.

TILT COVER
4. Remove the steering column tower cover and upper
cover. Be careful not to damage them.
5. Remove the four screws, then remove the hazard
warning switch and wiper switch.

HAZARD

WARNING

SWITCH

WIPER SWITCHProCarManuals.com