1991 ACURA NSX Service Repair Manual

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

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