ACURA NSX 1997 Service Repair Manual

Lighting System

Retractable Headlight Control Unit Input Test

Remove the rear bulkhead panels, and disconnect the

18P connector from the control unit.

Inspect the connector and socket 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.
BLU/RED

Wire Test condition Test: Desired result Possible cause if result is not obtained

BLK1

BLK2

RED/GRN2

WHT/GRN

YEL/WHT

PNK/BLK

RED/YEL'

RED/GRN1
Under all conditions

Headlight switch OFF and

retractor switch OFF

Retractor switch OFF

Retractor switch ON

Headlight switch

(headlights on)

Headlight switch

(headlights on)
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.

Check for voltage to ground:

There should be battery

voltage.

Check for voltage to ground:

There should be battery

voltage.
• Poor ground (G401, G402, G403)

• An open in the wire

• Poor ground (G401, G402, G403)

• An open in the wire

• Blown No. 42 (15 A) and No. 43 (15 A)

fuses

• Faulty retractor switch or headlight

switch

• An open in the wire

• Blown No. 42 (15 A) and No. 43 (15 A)

fuses

• Faulty retractor switch

• An open in the wire

• Blown No. 42 (15 A) and No. 43 (15 A)

fuses

• Faulty retractor switch

• An open in the wire

• Blown No. 43 (15 A) fuse

• Faulty headlight switch

• An open in the wire

• Blown No. 52 (20 A) fuse

• Faulty headlight relay or headlight

switch

• An open in the wire

• Blown No. 49 (20 A) fuse

• Faulty headlight relay or headlight

switch

• An open in the wire
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).ProCarManuals.com

Wire
Test condition

Test: Desired result
Possible cause if result is not obtained

LT
GRN/

RED
Passing switch ON
Check for voltage to ground:

There should be battery voltage.
• Faulty headlight relay or passing

switch

• An open in the wire

BLU/RED
Retractor motor stationary
Check for voltage to ground:

There should be battery volt-

age.
• Blown No. 42 (15 A) fuse

• Faulty right retractor relay

• An open in the wire

BLU1
• Blown No. 43 (15 A) fuse

• Faulty left retractor relay

• An open in the wire

Under all conditions

YEL
Check for continuity to ground:

There should be continuity.
• Faulty right retractor cut relay

• Poor ground (G202)

• An open in the wire

YEL/GRN
• Faulty left retractor cut relay

• Poor ground (G202)

• An open in the wire

Ignition switch ON

RED/YEL4
Connect battery power:

The retractable headlight mal-

function indicator should come

on.
• Faulty safety indicator circuit

• An open in the wire

Headlight retractor switch

OFF (retractable headlight

closed)

Connect an ohmmeter with

the negative lead to the

WHT/YEL terminal, and the

positive lead to the

GRN/WHT (orYEL/BLU)

terminal.
Check that there is no continuity

between the WHT/YEL and the

GRN/WHT (or YEL/BLU) termi-

nals.
• Faulty headlight retractor motor

Raise the headlights halfway

by turning the retractor knob

clockwise.
Check for continuity between the

WHT/YEL and the GRN/WHT1 (or

YEL/BLU) terminals: There

should be continuity.
• Faulty headlight retractor motor

• An open in the wire

Turn the retractor knob

clockwise until the head-

lights are fully raised.
Check for continuity between the

WHT/YEL and the GRN/WHT1 (or

YEL/BLU) terminals: There

should be continuity.
• Faulty headlight retractor motor

• An open in the wire

Headlight retractor switch

OFF (retractable headlight

closed)

Connect an ohmmeter nega-

tive lead to the YEL/WHT

terminal, and the positive

lead to the GRN/WHT' (or

YEL/BLU) terminal.
Check for continuity between

the YEL/WHT and the GRN/

WHT1 (or YEL/BLU) terminals:

There should be continuity.
• Faulty headlight retractor motor

• An open in the wire

Raise the headlights halfway

by turning the retractor knob

clockwise.
Check for continuity between the

YEL/WHT and the GRN/WHT1 (or

YEL/BLU) terminals: There

should be continuity.
• Faulty headlight retractor motor

• An open in the wire

Turn the retractor knob

clockwise until the head-

lights are fully raised.
Check that there is no continuity

between the YEL/WHT and the

GRN/WHT1 (or YEL/BLU) termi-

nals.
• Faulty headlight retractor motor
GRN/WHT1

(YEL/BLU)
WHT/YEL

GRN/WHT1

(YEL/BLU)
YEL/WHTProCarManuals.com

Lighting Syste m
Daytim e Runnin g Light s Contro l Uni t Inpu t Tes t (Canada )
Remove th e glov e bo x lowe r pane l an d glov e box .
Disconnec t th e 4 P an d 8 P connector s fro m th e daytim e
runnin g light s contro l unit .
Inspec t th e connecto r an d socke t terminal s t o b e sur e
the y ar e al l makin g goo d contact .
I f th e terminal s ar e bent , loose, or corroded , repai r
the m as necessary , an d rechec k th e system .
I f th e terminal s loo k OK , mak e th e followin g inpu t
test s a t th e connector .
— If an y tes t indicate s a problem , fin d an d correc t
th e cause , the n rechec k th e system .
— If al l th e inpu t test s prov e OK , th e contro l uni t
mus t b e faulty ; replac e it .
DAYTIM E RUNNIN G LIGHT SCONTRO L UNI T (Canada )
4P CONNECTO R
View fro m wir e sid e
GRN/RED
Wir eTes t conditio n Test: Desire d resul t
Possible caus e if resul t i s no t obtaine d
BLK
PNK/WH T
BLK/RED
PNK/BL K
YEL/BLK
GRN/RE D
GRN/YEL
Under al l condition s
Unde r al l condition s
Ignitio n switc h O N (II )
Headligh t switc h
(headlight s on )
Unde r al l condition s
Ignitio n switc h O N (II )
Parkin g brak e switc h O N
(parkin g brak e leve r up )
Chec k fo r continuit y t o ground :
Ther e shoul d b e continuity .
Chec k fo r voltag e t o ground :
Ther e shoul d b e batter y
voltage .
Chec k fo r voltag e t o ground :
Ther e shoul d b e batter y
voltage .
Check fo r voltag e to ground :
Ther e shoul d b e batter y
voltage .
Check fo r continuit y t o ground :
Ther e shoul d b e continuity .
Connec t t o ground : Th e brak e
syste m ligh t shoul d com e on .
Chec k fo r continuit y t o ground :
Ther e shoul d b e continuity .•
Poo r groun d (G401 , G402 , G403 )
• A n ope n in th e wir e
• Blow n No . 4 4 (1 0 A ) fus e
• A n ope n in th e wir e
• Blow n No . 3 (7. 5 A ) fus e
• A n ope n in th e wir e
• Blow n No . 4 3 (1 5 A ) fus e
• Fault y headligh t switc h
• A n ope n in th e wir e
• Blow n daytim e runnin g ligh t bulb s
• Poo r groun d (G301 )
• A n ope n in th e wir e
• Blow n No . 5 (1 5 A ) fus e
• Blow n bul b
• A n ope n i n th e wir e
• Fault y parkin g brak e switc h
• A n ope n in th e wir e
ProCarManuals.com

Combination Light/Tur n Signa l Switc h Tes t
1. Remov e th e dashboar d lowe r cove r (se e pag e 23-184 ).
2 . Disconnec t th e 18 P connecto r fro m th e floo r wir e
harness .
3. Chec k fo r continuit y betwee n th e terminals , i n eac h
switc h position , accordin g t o th e table .
Headligh t
witc h
Positio
n
All position s
Terminal
OFF
23457812131 5161 8
Passin gswitchON
HIG H
LOW
Tur n Signa l Switc h
Headlight/Dimmer/Passin
g Switc h
Termina l
Position
RIGHT
NEUTRA L
LEF T
6101 1
Dimme rswitch
Headligh t
switch
ProCarManuals.com

Lighting Syste m
Headlight/Tur n Signa l Switc h Replacemen t
SRS component s ar e locate d i n thi s area . Revie w th e
SR S componen t locations , precautions , an d procedure s
i n th e SR S sectio n 24 befor e performin g repair s o r ser -
vice .
1 . Remov e th e dashboar d lowe r cover , an d disconnec t
th e connectors .
2 . Remov e th e dashboar d lowe r pad .
DASHBOAR D LOWE RCOVER
DASHBOAR D LOWE RPAD
3. Remov e the tilt cover .
TILT COVE R
4. Remov e th e steerin g colum n covers .
NOTE : B e carefu l no t t o damag e th e steerin g col -
um n covers .
UPPER COVE R
LOWE R COVE R
ProCarManuals.com

5. Disconnect the 18P and 10P connectors.

CAUTION: Be careful not to damage the SRS wire

harness.

6. Remove the six screws, then remove the headlight-

turn signal switch assembly.

HEADLIGHT SWITCH

10P CONNECTOR

18PXJONNECTOR

TURN SIGNAL SWITCH

7. If necessary, remove the turn signal cancel unit and

cancel switch.

TURN SIGNAL

CANCEL UNIT
TURN SIGNAL

CANCEL SWITCH
8. If necessary, remove the headlight switch bulb.

HEADLIGHT SWITCH

BULB (0.91 W)ProCarManuals.com

Lighting Syste m
Retracto r Switc h Remova l
SRS component s ar e locate d in thi s area . Revie w th e SR S
componen t locations , precautions , an d procedure s i n th e
SR S sectio n 24 befor e performin g repair s o r service .
1 . Remov e th e dashboar d lowe r cover , an d disconnec t
th e connectors .
2 . Remov e th e dashboar d lowe r pad .
DASHBOAR D LOWE RCOVER
3. Remov e the tilt cover .
DASHBOAR DLOWERPAD
TIL T COVE R
4. Remov e th e steerin g colum n covers .
UPPER COVE R
LOWER COVE R
5. Disconnec t th e 5 P an d 10 P connector s fro m eac h
switch .
TCS SWITC H
5 P CONNECTO R
10 P CONNECTO R
RETRACTOR SWITC H
6. Remov e th e si x screws , the n remov e th e instrumen t
pane l tri m fro m th e dashboard .
INSTRUMEN T PANE L TRI M
RETRACTO R SWITC H
7. Remov e th e tw o screws , the n remov e th e retracto r
switch fro m th e instrumen t pane l trim .
ProCarManuals.com

Retractor Switc h Tes t
1. Remov e th e retracto r switc h (se e page 23-186 ).
2 . Chec k fo r continuit y betwee n th e terminal s i n eac h
switc h positio n accordin g t o th e table .
Retracto r Switc h
RETRACTO R SWITC H
Retracto r Switc h
Retracto r Switc h Ligh t Bul b Replacemen t
1. Remov e th e retracto r switc h (se e page 23-186 ).
2 . Tur n th e bul b 45 ° counterclockwis e t o remov e it .
RETRACTO R SWITC H
BUL B (0.84W )
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Lighting System

Retractor Motor Replacement

CAUTION:

Halogen headlights can become very hot in use; do

not touch them or the attaching hardware immediately

after they have been turned off.

Do not try to replace or clean headlights with the lights

1. Remove the No. 42 (15 A) and No. 43 (15 A) fuses

from the under-hood fuse/relay box.

No. 43
(15A)

FUSE

No. 42
(15A)

FUSE

UNDER-HOOD FUSE/RELAY BOX

2. Turn the knob clockwise to raise the headlight.

CAP
3. Remove the two caps, four screws, and cowl clips.

COWL CLIP

CAP

4. Slide the headlight housing forward and up.

NOTE: Be careful not to damage the front bumper

or the headlight housing.

HEADLIGHT HOUSING

PROTECTIVE TAPE

5. Disconnect the 6P connector from the headlight

unit.

6P CONNECTOR
MOUNTING

BOLTS

HEADLIGHT UNIT

6. Remove the four mounting bolts, then remove the

unit.
KNOB
SCREWProCarManuals.com

7. Disconnect the 6P connector.

MOUNTING BOLT/NUT

9.8 N-m (1.0 kgf-m, 7 Ibf-ft) '/•

RETRACTOR

MOTOR

BRACKET

6-P CONNECTOR

MOTOR ARM JOINT

8. Remove the two mounting bolts and the mounting

nut.

9. Pry the retractor linkage off the motor arm.

10. Pull out the retractor motor.

11. Install in the reverse order of removal, and:

Make sure there is no interference between the

wire harness and linkage.

Coat the joint with grease, and make sure the

linkage moves smoothly.ProCarManuals.com