1997 ACURA NSX Service Repair Manual

Immobilizer Syste m
Componen t Locatio n Inde x
IMMOBILIZE R INDICATO R LIGH T
(I n th e gaug e assembly )
Bul b Locations , pag e 23-12 8
CLUTC H INTERLOC K SWITC H
(M/T)Test, pag e 23-8 0
IMMOBILIZE R CONTRO L
UNITInpu t Test , pag e23-33 4
IMMOBILIZE R RECEIVE R
Test , pag e 23-33 5
Replacement , pag e 23-33 6
A/T GEA R POSITIO N
SWITC H
Test , pag e 23-16 2
STARTE R CU T RELA YWire colors : BLK/WHT ,
BLK/WHT , BLK/GRN ,
an d BLK/BL U
Test , pag e 23-8 0
TRANSPONDE R(Built int o th e ignitio n key )Test , pag e 23-33 5
IGNITIO N KEY(Maste r an d vale t keys )
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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

IGNITION SWITCH

PROPER KEY

INSERTED
INDICATOR

LIGHT

WRONG KEY

INSERTED
INDICATOR

LIGHT
If the proper key has been used, the starter cut relay will be energized, and the ECM will energize the fuel supply sys-

tem. The immobilizer indicator light in the gauge assembly will simultaneously come on for about two seconds, then

go off, thereby signaling that the immobilizer unit has recognized the code sent by the transponder.

If a key has been used whose code was not received or recognized by the unit, or which was not approved by Acura,

the indicator light will come on for about two seconds, then it will blink continuously.

If the ignition switch is turned OFF, the indicator will blink for about five seconds to signal that the unit has been set

correctly, then the indicator will go off.

IMMOBILIZER INDICATOR LIGHT BLINKING PATTERN:ProCarManuals.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 Syste m
Contro l Uni t Inpu t Tes t
1. Remov e th e dashboar d lowe r cove r an d dashboar d
lowe r pa d (se e pag e 23-73 ).
2 . Remov e th e dashboar d brac e (se e pag e 23-73 ).
3 Disconnec t th e 8 P connecto r "A " fro m th e immobi -
lize r contro l unit .
4 . 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 , o r corroded , repai r
the m a s 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 cor -
rec t th e cause , the n rechec k th e system .
— If al l th e inpu t test s prov e OK , chec k th e immo -
bilize r receive r an d transponder .IMMOBILIZER CONTRO L UNI T
8 P CONNECTO R
"A"
Vie w fro m
wir e side
Wir e Test conditio n Test: Desire d result s
Possible caus e if resul t i s no t obtaine d
YEL/BLU
GRY
BLK/GR N
BLK/YEL
PNK
BR N
GRN/RE D
BLK
Unde r al l condition s
M/T : Wit h clutc h peda l
depresse d
A/T: Shif t leve r i n
or
Ignitio n switc h a t
STAR T (III )
Ignitio n switc h O N (II )
Unde r al l condition s
Unde r al l condition s
Ignition switc h OF F
Unde r al l condition sChec
k fo r voltag e t o ground :
Ther e shoul d b e batter y voltage .
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 .
Attac h t o ground :
Th e immobilize r indicato r ligh t
shoul d com e on .
*Chec k fo r continuit y betwee n th e
No . 6 termina l an d EC M 26 P (C484 )
connecto r No . 3 terminal .
Ther e shoul d b e continuity .
Chec k fo r continuit y t o ground :
Ther e shoul d b e continuit y wit h th e
parkin g brak e leve r u p an d n o
continuit y wit h th e leve r down .
Chec k fo r continuit y t o ground :
Ther e shoul d b e continuity . •
Blow n No . 1 8 (2 0 A ) fus e
• A n ope n i n th e wir e
• Fault y clutc h interloc k switc h
• A n ope n i n th e wir e
• Fault y A/ T gea r positio n switc h
• A n ope n i n th e wir e
• Fault y starte r cu t rela y
• A n ope n i n th e wir e
• Blow n No . 2 (1 5 A ) fus e
• A n ope n i n th e wir e
• Blow n No . 3 3 (7. 5 A ) fus e
• Blow n bul b
• Fault y gaug e circui t
• A n ope n i n th e wir e
• A n ope n i n th e wir e
• Fault y parkin g brak e switc h
• A n ope n o r shor t i n th e wir e
• Fault y brak e flui d leve l switc h
• Poo r groun d (G401 , G402 , G403 )
• A n ope n i n th e wir e
* : Us e th e backprobin g metho d explaine d i n sectio n 11 .
23-33 4ProCarManuals.com

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-

tor.ProCarManuals.com

Immobilizer Syste m
Immobilize r Receive r Replacemen t
1. Remov e th e dashboar d lowe r cove r an d dashboar d
lowe r pa d (se e pag e 23-73 ).
2 . Remov e th e dashboar d brac e (se e pag e 23-73 ).
3 . Disconnec t th e 3 P connecto r fro m th e immobilize r
contro l unit . Thi s harnes s i s shielde d an d serve s a s
a communicatio n link ; b e carefu l no t t o damag e it .
4 . Remov e th e scre w fro m th e immobilize r receiver ,
then remov e th e receive r fro m th e ignitio n ke y
cylinder .
IMMOBILIZE R RECEIVE R
IGNITION KEYCYLINDE R
5. Instal l th e ne w immobilize r receive r i n th e revers e
orde r o f removal .
6 . Afte r replacement , chec k th e immobilize r system .
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24-37
24-23, 24-14
24-14
24-14
24-1 0
24-14
Specia l Tool s
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