1991 ACURA NSX Service Repair Manual

Brake Ligh t Failur e Senso r Tes t
1. Firs t mak e sur e th e brak e light s com e o n whe n th e
brak e peda l i s pressed .
• I f al l th e brak e light s com e on , g o t o ste p 2 .
• I f on e o f th e brak e light s doe s no t com e on , chec k
whethe r th e bul b is blown . I f th e bul b is OK , g o
to ste p 2 .
• I f non e of the brak e light s com e on , chec k th e
brak e ligh t circui t.
2 . Ope n th e trun k lid , an d remov e th e tri m pane l tha t
cover s th e righ t taillight . Watc h th e
ligh t i n th e safet y indicato r whe n th e A (WHT/GRN )
wir e o f th e 6- P connecto r i s grounde d an d th e igni -
tion switc h is turne d fro m OF F to O N (II) .
RIGH T FAILUR E SENSO R
6- P CONNECTO R
Vie w fro m wir e sid e
If th e ligh t come s o n an d stay s
on , chec k fo r a n ope n in th e A (WHT/GRN ) wir e
betwee n th e safet y indicato r an d th e righ t failur e
sensor .
If th e ligh t doe s no t sta y on , g o
t o ste p 3 .
3. Watc h th e ligh t a s yo u tur n th e igni -
tion switc h fro m OF F to O N (II) , wit h th e B (GRN )
wire o f th e 6- P connecto r grounde d an d th e brak e
peda l pressed .
If th e ligh t come s o n an d stay s
on, replac e th e righ t failur e sensor .
If th e ligh t doe s no t sta y o n , g o
t o ste p 4 . 4
. Remov e th e rea r tri m pane l tha t cover s th e lef t tail -
light . Watc h th e ligh t a s yo u tur n th e
ignitio n switc h fro m OF F to O N (II) , wit h th e A (GRN )
wire o f th e 6- P connecto r grounde d an d th e brak e
peda l pressed .
LEFT FAILUR E SENSO R
6-P CONNECTO R
View fro m wir e sid e
If th e ligh t come s o n an d stay s
on , ther e is a n ope n in th e A (GRN ) wir e betwee n
th e lef t failur e senso r an d th e righ t failur e sensor .
If th e ligh t doe s no t sta y on , g o
t o ste p 5 .
5. Watc h th e ligh t a s yo u tur n th e igni -
tion switc h fro m OF F to O N (II) , wit h th e B (BLK ) wir e
of th e 6- P connecto r grounde d an d th e brak e peda l
pressed .
• I f th e ligh t come s o n an d stay s
on , replac e th e lef t failur e sensor .
• I f th e ligh t doe s no t sta y on , chec k
fo r a n ope n in th e B (BLK ) wir e betwee n th e lef t
failur e senso r an d ground , an d chec k fo r a poo r
groun d a t G551 .
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Safety Indicato r (NSX- T "ope n top" )
Roof Loc k Switc h Tes t
1. Remov e th e headline r (se e sectio n 20 ).
2 . Disconnec t th e 3- P connecto r fro m th e roo f loc k
switch .
ROOF LOC KSWITC H
View fro mwire sid e
3. Ther e shoul d b e continuit y betwee n th e A an d B ter -
minal s wit h th e switc h release d (roo f unlatche d o r
off) .
4. Ther e shoul d b e n o continuit y wit h th e switc h
pushe d (roo f latched) .
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Roof Holder Switch Test

1. Open the rear hatch and engine cover.

2. Disconnect the 1- P connector from the roof holder

switch.

3. There should be continuity between the A and B ter-

minals with the switch released (roof not stored).

4. There should be no continuity with the switch

pushed (roof stored).

Roof not stored (ON)

Roof stored (OFF)ProCarManuals.com

A/T Gea r Positio n Indicato r
Componen t Locatio n Inde x
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 .
NOTE : Fo r indicato r troubleshooting , refe r t o sec -
tion 14 .
A/T GEA R POSITIO N
INDICATO R
Inpu t Test , pag e 23-15 8
TRANSMISSIO N
CONTRO L MODUL E (TCM )
Se e Automati c Transmissio n
sectio n 1 4
A/ T GEA R POSITIO N
SWITC H
Test , pag e 23-16 0
Replacement , pag e 23-16 1
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A/T Gear Position Indicator
Indicator Input Test

SRS components are located in this area. Review the

SRS component locations, precautions, and procedures
in the SRS section (24) before performing repairs or ser-

vice.

Remove the dashboard lower cover, dashboard lower
pad and instrument panel. Disconnect the connector

"A" 130-P) from the gauge assembly (see page 23-127
('93-'96) ('91-'92)).

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 a 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.

CONNECTOR "A"

(30-P)
CONNECTOR "'B"

YEL
RED2

RED/BLK

BRN/YEL

ORN/BLK
GRN/YEL

LT GRN/WHT

BLK
BLU/ORN
RED1

YEL/BLK
LT BLU

GRY/WHT
GRN
BRN/BLK

View from wire sideProCarManuals.com

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A/T Gea r Positio n Indicato r
A/T Gea r Positio n Switc h Tes t
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 ser -
vice .
1. Remov e th e console , the n disconnec t th e 12- P an d
2- P connector s fro m th e A/ T gea r positio n switch .
2 . Chec k fo r continuit y betwee n th e terminal s i n eac h
switc h positio n accordin g to th e table .
• Mov e th e leve r bac k an d fort h a t eac h switc h
positio n withou t touchin g th e pus h button , an d
chec k fo r continuit y withi n th e rang e o f fre e play .
• I f ther e i s n o continuit y withi n th e rang e o f fre e
play , adjus t th e positio n o f th e switc h a s describe d
below.
A/T Gea r Positio n Switc h
A/T GEA R POSITIO N SWITC H
Vie w fro m wir e sid e
Back-u p Neutra l
Ligh t Switc h Positio n Switc h
Adjustment :
1. Shif t t o position , an d loose n th e bolts .
2. Slid e th e switc h in th e directio n o f positio n [with -
i n 2. 0 m m (0.0 8 in) ] unti l ther e is continuit y betwee n
No . 8 an d No . 1 1 terminal s in th e rang e o f fre e pla y
o f th e shif t lever .
3 . Rechec k fo r continuit y betwee n eac h o f th e termi -
nals.
NOTE :
• I f adjustmen t i s no t possible , chec k fo r damag e
t o th e shif t leve r deten t and/o r bracket . I f ther e is
n o damage , replac e th e A/ T gea r positio n switch .
• Yo u shoul d b e abl e t o star t th e engin e wit h th e
shif t leve r i n positio n withi n th e rang e o f fre e
play .
Positio n P
LOC K PI N
BOLT S
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A/T Gear Position Switch

Replacement

SRS components are located in this area. Review the
SRS component locations, precautions, and procedures
in the SRS section (24) before performing repairs or ser-

vice.

1. Remove the console, then disconnect the 12-P and 2-P connectors from the A/T gear position switch.
SWITCH SLIDER (In )

PIN

A/T GEAR POSITION SWITCH
2. Remove the two position switch mounting bolts. 3. Position the slider on the new switch to as shown

above.
4. Shift the shift lever to , then slip the switch into
position,
5. Attach the switch with the two bolts. 6. Test the switch in the and positions. You
should be able to start the engine with the shift lever in position anywhere in the range of free
play.
7. Connect the 12-P and 2-P connectors, clamp the harness, and install the console. Bulb Replacement
SRS components are located in this area. Review the
SRS component locations, precautions, and procedures in the SRS section (24) before performing repairs or ser-

vice.

1. Remove the gauge assembly (see page 23-126).
2. Disassemble the gauge assembly (see page 23-129

('93-'96) ('91-'92)).

3. Remove the bulb from printed circuit board B.
PRINTED CIRCUIT

BOARD B

BULB (1.12 W)

4. Install the indicator in the reverse order of removal.ProCarManuals.com