engine ACURA NSX 1997 Service Repair Manual

Rear Window Defogger Timer System:

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

A8

A9

A5

WHT/RED

A10
Under all conditions

Under all conditions

Ignition switch ON (II)

Defogger switch

pushed

Ignition switch ON (II)
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 to ground:

There should be continuity as the

switch is pushed.

Attach to ground: The rear window

defogger should work and the

defogger switch indicator light

should come on.
• Poor ground (G401, G402, G403)

• An open in the wire

• Blown No. 34 (15 A) fuse

• An open in the wire

• Blown No. 5 (15 A) fuse

• An open in the wire

• Faulty defogger switch

• Poor ground (G401, G402, G403)

• An open in the wire

• Blown No. 4 (15 A) fuse

• Faulty defogger relay

• Blown bulb

• An open in the wire

Oil Pressure Indicator System:

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

A8

A9

A5 '

WHT/BLU2

YEL/RED
Under all conditions

Under all conditions

Ignition switch ON (II)

Engine running

Ignition switch OFF

Ignition switch ON (II)

Start the engine.
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 continuity to ground:

There should be continuity.

Check indicator light operation.

If the light does not come on, attach

the YEL/RED terminal to ground: The

light should come on as the ignition

switch is turned ON (II).

Check for voltage to ground:

There should be battery voltage.
• Poor ground (G401, G402, G403)

• An open in the wire

• Blown No. 34 (15 A) fuse

• An open in the wire

• Blown No. 5 (15 A) fuse

• An open in the wire

• Faulty charging system

• An open in the wire

• Faulty engine oil pressure switch

• An open in the wire

• Blown bulb

• An open in the wire

• Insufficient oil

• Improper lubrication

• Faulty engine oil pressure switch

(cont'd)ProCarManuals.com

Rear Windo w Defogge 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
in th e SR S sectio n 24 befor e performin g repair s o r ser -
vice .
REA R WINDO W DEFOGGE R
TIME R CIRCUI T
(I n th e integrate d contro l unit )
Inpu t Test , pag e 23-16 9
REAR WINDO W DEFOGGE R
Functio n Test , pag e 23-29 0
UNDER-DAS H FUS E BO X REA
R WINDO W
DEFOGGE R SWITC H
Removal , pag e 23-28 7
Test , pag e 23-28 9
REA R WINDO W
DEFOGGE R RELA YTest, pag e 23-28 8
ENGINE COMPARTMEN T
FUSE/RELA Y BO X
Descriptio n
The rea r windo w defogge r i s controlle d b y th e integrate d contro l unit . Whe n th e defogge r switc h i n th e combinatio n
switc h i s pushed , i t send s a signa l t o th e defogge r time r i n th e integrate d contro l unit , an d th e defogge r stay s o n fo r 2 5
minute s (4 0 minute s fo r Canad a models ) o r unti l th e ignitio n switc h i s turne d off .
Th e indicato r ligh t i n th e switc h show s whe n th e defogge r i s on .
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Security Alar m Syste m
Wiring Connection s
"1: NSX- T (ope n top )
TRUN K KE Y
CYLINDE R SWITC H
REARWIREHARNES S
RIGH T
TAILLIGH T
ENGINECOMPARTMEN T LI D
SWITC H
DRIVER'S
DOO R KE Y
CYLINDE RSWITCH
' SECURIT Y
INDICATO R
DRIVER' S DOO R LOC K
ACTUATO R ASSEMBL Y
PASSENGER' S
DOO R KE Y
CYLINDE RSWITCH
PASSENGER' S
DOO R
LOCKACTUATO R
ASSEMBL Y
IGNITION KEYSWITC H
IGNITIO NSWITCH
UNDER-HOO D RELA Y BO X A
(HOR N RELAY )
FLOOR WIR E HARNES S
DRIVER' S DOO R
WIR E HARNES S
RIGHT REA RSIDE MARKE R
LIGH T TRUN
K LATC H
SWITC H
RETRACTABL EHEADLIGHTCONTROLUNIT
LEF TTAIL -
LIGH T
HEADLIGHT
RETRACTO RRELAYS
BATTER Y
SECURIT Y HOR N
LEF T HEADLIGH T
LEF T FRON T SID E
MARKE R LIGH T
RIGH T ROO F LOC K
SWITCH*1
PASSENGER' S
DOO R WIR E
HARNES S
SECURIT Y CONTRO L
UNIT
FRON T COMPARTMEN T
WIR E HARNES S
UNDER-HOO D FUSE/RELA Y BO X
(HEADLIGHT/TAILLIGHT /DIMMER RELAY ) LEF
T FRON T
PARKIN G
LIGH T
LEF T (LOW ) HOR N
HOO DSWITC H
FRONT COMPARTMEN TWIRE HARNES S
RIGH T FRON T SID E MARKE R
LIGH T
RIGHT HEADLIGH TRIGH
T (HIGH ) HOR N
RIGH T PARKIN G
LIGH T
LEFT REA RSIDE MARKE R LIGH TSWITCH*1
LEFTROO FLOCK
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Engine Compartmen t Li d Switc h
Test
1. Ope n th e engin e compartmen t lid .
2 . Disconnec t th e 2 P connecto r fro m th e engin e com -
partmen t li d switch .
3 . Chec k continuit y a t th e switc h connecto r terminals .
Ther e shoul d b e continuit y betwee n th e terminal s
wit h th e leve r release d (li d open) .
There shoul d b e n o continuit y wit h th e leve r
pushe d dow n (li d closed) .
LEVER
2P CONNECTO R
View fro m
termina l sid e
Switc h Tes t
1. Ope n th e hood .
2 . Disconnec t th e 2 P connecto r fro m th e hoo d switch .
3 . Chec k continuit y a t switc h connecto r terminals .
There shoul d b e continuit y betwee n th e terminal s
with th e leve r release d (hoo d open) .
There shoul d b e n o continuit y with the leve r
pushe d dow n (hoo d closed) .
LEVER
2P CONNECTO R
23-327ProCarManuals.com

Immobilizer Syste m
Descriptio n
The vehicl e i s equippe d wit h a n immobilize r syste m tha t wil l disabl e th e vehicl e unles s th e prope r ignitio n ke y i s used .
Thi s syste m consist s o f a transponde r locate d i n th e ignitio n key , a receiver , a contro l unit , a n indicato r light , an d th e ECM .
Th e vehicl e ha s tw o kind s o f keys .
BLAC K
GRAY
The maste r ke y i s for :
— ignitio n switch .
— doo r locks .
— trun k lock .
— glov e bo x lock .
Th e vale t ke y i s for :
— ignitio n switch .
— doo r locks .
Th e learnin g ke y i s fo r rewritin g th e immobilize r sys -
tem.
NOTE : Thi s ke y canno t star t th e engine ; d o no t us e i t
excep t fo r rewritin g th e system . I f someon e trie s t o
star t th e engin e wit h th e learnin g key , al l maste r an d
vale t key s mus t b e relearned .
Whe n th e ke y i s inserte d i n th e ignitio n an d turne d t o th e (II ) position , th e immobilize r contro l uni t send s powe r t o th e
transponde r throug h th e receiver .
Th e transponde r the n send s a code d signa l bac k throug h th e receive r t o th e contro l unit .
Th e contro l uni t i n tur n signal s th e ECM , a s wel l a s th e starte r cu t relay .
RED
IMMOBILIZE R RECEIVE R
IGNITION KE Y(Has built-i n transponder )
23-330ProCarManuals.com

Immobilizer Syste m
Problem s an d Replacemen t Part s
Parts Set :
A: Blan k ke y
B: Immobilize r contro l uni t
Maste r ke y
Learnin g ke y
C : Immobilize r receive r
D : Ignitio n switc h wit h immobilize r receive r
Immobilize r contro l uni t
Maste r ke y
Learnin g ke y
E: EC M
F: Doo r ke y cylinde r
Maste r key s fo r door s ope n o r locke d
G : Ignitio n switc h wit h immobilize r receive r
Immobilize r contro l uni t
Maste r ke y
Learnin g ke y
Doo r ke y cylinder s
Trun k ke y cylinde r
Glov e bo x ke y cylinde r
NOTE:
The immobilize r syste m ca n stor e u p t o fiv e ke y codes .
I f i t i s necessar y t o rewrit e th e immobilize r contro l uni t t o lear n a ne w key , th e deale r need s th e customer' s vehicle , al l
it s maste r key s an d vale t keys , it s learnin g key , an d th e Hond a PG M Teste r equippe d wit h a n immobilize r progra m
card . An y ke y tha t i s no t learne d durin g rewritin g wil l n o longe r star t th e engine .
I f th e custome r ha s los t hi s key , an d canno t star t th e engine , contac t Acur a Custome r Relation s o r Roadsid e Assistance .
Befor e Testing :
Du e t o th e actio n o f th e immobilize r system , th e engin e take s slightl y mor e tim e t o star t tha n th e engin e o f a vehicl e
withou t a n immobilize r system .
Whe n th e syste m is normal , an d th e prope r ke y i s inserted , th e indicato r ligh t come s o n fo r tw o seconds , the n i t wil l g o
off .
If th e indicato r start s t o blin k afte r tw o seconds , o r i f th e engine does no t start , repea t th e startin g procedure .
— If th e engin e stil l doe s no t start , perfor m th e immobilize r contro l uni t inpu t tes t an d transponde r an d immobilize r
receive r test .
I f al l th e inpu t test s an d transponde r an d immobilize r receive r tes t prov e OK , chec k th e EC M (se e sectio n 11 ).
— If th e EC M is OK , th e immobilize r contro l uni t mus t b e faulty ; replac e th e immobilize r contro l unit , maste r ke y an d
learnin g ke y together , an d the n rewrit e th e EC M wit h th e Hond a PG M Tester .
— If th e EC M is faulty , substitut e a known-goo d ECM , an d recheck . However , sinc e th e known-goo d EC M ha s a differ -
ent cod e store d int o it , i t mus t b e rewritte n wit h th e Hond a PG M Tester . Otherwise , th e engin e wil l no t start .
Proble m Parts se t
Maste r o r vale t ke y ha s bee n los t o r additiona l maste r o r vale t ke y i s required .
Al l maste r an d vale t key s hav e bee n lost .
Learnin g ke y ha s bee n lost .
Immobilize r receive r doe s no t work .
Immobilize r contro l uni t doe s no t work .
ECM doe s no t work .
Ignitio n switc h doe s no t work .
Doo r ke y cylinde r ha s bee n broken . PCM-Teste
r
required?
A
A x 2, and B
B
C
B
E
D
F(G )
YES
YES
YES
NO
YES
YES
YES
NO (YES)
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Immobilizer Receiver and Transponder (Key) Test

IMMOBILIZER

CONTROL

UNIT

Does the immobilizer indi-

cator blink?
Perform the control unit input

test.

Try to start the engine with another

master key or valet key from this

vehicle.

Does the engine start?
Replace the transponder (igni-

tion key).

3P CONNECTOR

"B"

Does the engine crank?

Rewrite the immobilizer control

unit and the ECM with the PGM

Tester.
Check for an open in the BRN

wire between the immobilizer

control unit and the ECM. If the

wire is OK, rewrite the ECM with

the PGM Tester.

Does the engine start?

Immobilizer system is OK now.

Wire side of

female terminals

Is there continuity?
Short in the shielded wires

between the immobilizer receiver

and the immobilizer control unit.

Replace the wire harness.

Measure resistance between the

B1 and B3 terminals of the 3P con-

nector.

Is there about 15 ohms?
Faulty receiver or open in the

shielded wires between the immo-

bilizer receiver and immobilizer

control unit.

Replace the immobilizer control

unit.
1. Turn the ignition switch ON (II).

2. Check that the immobilizer

indicator light starts blinking

after two seconds.

1. Turn the ignition switch OFF.

2. Disconnect the 3P connector

"B" from the immobilizer con-

trol unit.

3. Check for continuity between

the B1 and B2, and the B3 and

B2 terminals of the 3P connec-

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