Toyota Supra 1987 Quick start guide

TOYOTA

ELECTRICAL WIRING DIAGRAM

FOREWORD

This

wiring

diagram

has

been prepared

to

provide

information

on

the

electrical system

of

the

1

987

TOYOTA

SUPRA.

Applicable models:

MA70

series

For

other

service specifications and repair procedures

of

the

1

987

TOYOTA

SUPRA than listed in

th

is manual, refer

to

the

following

repair manuals;

Manual Name Pub

No

.

1987

Toyota

Supra Repair Manual

RM043U

TCCS (7M-GE} Diagnosis Manual

DM008U

ECT

(A340E}

Diagnosis Manual

DM006U

All

information

in

the

manual

is

based on

the

latest

product

information

at

the

time

of

publ

ication

. However, specifications

and procedures are subject

to

change

without

notice

.

TOYOTA

MOTOR

CORPORATION

1987

TOYOTA

SUPRA

ELECTRICAL

WIRING

DIAGRAM

INTRODUCTION

.................

.

HOW

TO

USE THIS

MANUAL

....

...

.

TROUBLESHOOTING

....

.

......

. . .

GLOSSARY

OF

TERMS

AND

SYMBOLS

POWER SOURCE .

....

. .

....

...

..

. .

STARTING

AND

IGNITION

SYSTEM

..

EFI

SYSTEM

..

...........

...

..

...

.

CHARGING

SYSTEM

.....

....

. .

...

.

LIGHT

AUTO

TURN

OFF

SYSTEM . . . .

©

1986

TOYOTA

MOTOR

CORPORAT

I

ON

All

rights reserved.

This

book

may

not

be

re-

produced

or

copied,

in

whole

or

in

part,

without

the

written

per

mission

of

Toyota

Motor

Corpora

-

tion.

..

-

..

TURN

SIGNAL

AND

HAZARD

WARNING

LIGHTS

-

HEADLIGHTS

.

..

.

..

. .

.....

.

..........

.

..

.

FOG

LIGHTS

....

.

..

...

....

.

......

.

.....

..

. .

--

-

INTERIOR

LIGHTS

...

.

..

...

..

.

....

...

. .

..

. . -

BACK

-UP

LIGHTS

. . . . . . . . . . . . . . . . . . . . . . . . . . . MC.8

STOP

LIGHTS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . MIM

TAILLIGHTS

AND

ILLUMINATION

. . . . . . . . . . . . •

••

REMOTE

CONTROL

MIRRORS

.

....

..

.........

MN

REAR

WINDOWDEFOGGER

AND

MIRROR

HEATER

MIM

FRONT

WIPER

AND

WASHER

.........

..

.

DOOR LOCKS .

................

. .

......

.

..

. .

REAR WIPER

AND

WASHER

..

.

.....

.

...

.

..

. . .

POWER WINDOWS

..

.............

..

...

..

.

..

.

POWER

SEAT

. .

..................

........

. .

CRUISE

CONTROL

. . . .

..

. .

...

.

.......

.

....

. .

ECT SYSTEM .

....

. .

.......

..

.....

.

.....

.

..

.

A.

B.

S. .

..

. .

..

..........

.....

.

......

. . .

..

.

HEADLIGHT

CLEANER

.......

...

..

.

.......

.

CIGARETTE

LIGHTER

AND

CLOCK

......

.

...

.

TEMS

...

....

..

. . .

....

· · · · · · · · · · · · · · · · · · · · ·

UNLOCK

AND

SEATBELT

WARNING

...

. .

....

.

SUPER

MONITOR

...

.

....

...

. .

..

.

........

. . .

HORNS . . .

.....

. . . .

.....

..

. . . . . .

~~

::

. . .

..

.

THEFT

DETERRENT

SYSTEM

.......

.

.......

.

AUTO

ANTENNA

......

....

.............

...

.

RADIO

AND

TAPE

PLAYER

.........

.

...

....

.

COMBINATION

METER

.................

...

. .

AUTOMATIC

AIR

CONDITIONER

........

....

.

GROUND

POINTS

...................

...

. .

..

.

RELAY

LOCATIONS

..

...............

..

. .

..

.

ELECTRICAL

WIRING

ROUTING

. .

......

...

..

.

OVER

ALL

ELECTRICAL

WIRING

DIAGRAM

...

.

.,.

ME:M

•wl

•.aM

.

.,.

•1•

••

•1•

•4•

••

....

•1:•

••

•••

••

•t•

..

••

-

A. INTRODUCTION

This manual

is

composed

of

the

following

5 elements.

Power Source System

Circuit

Ground Points Relay Location

& Wiring

Routing

Over all Wiring

Diagram

Circuit

from

battery

to

each

fuse

Each

circuit

classified

by

system

Relation between

ground points

of

each

component

Relay & Connector

location Shows relation

between

each

system

System

No

. System

Title

8

~

HEADLIGHTS

:l

!tjlf·

··-

~...

.

.,...

U}·. m

...

rn

·+

..

l.

•

"'

"

"'

;@

T • '

C>

·

HEADLIGHT

·--

·

•

4

~

:

'-'-

..

_LH_

--"-"---'

. .

·t_ ·.

,@

·~

i

£

:i :

:I

.."

•f

·~

.

~

.

$

11

1:1.,

1

Components

@11.

o.<

1

rraQm

®

-®

1

1tliJ

0

11

1

1'

1

@]

,-----,

e

tm

Circuit

4

2C

~

I

IC

G>

©

~

® ®

u i

®

Connector

Illustration

Jb

®•

~•C

'

a

~

I

Connector

@

(Wire Harness Side)

®

Junction

Block

No

. 2 I I (Wire Harness Side)

Note:

The number indicates the number

of

the

junction

block.

Male 1Male

Wire

to

Wire Connector '

jl

Female

Female Male

ELECTRI

CAL

WIRING

ROUTING

.··-·-- ·-

··

.··

-·-·

-

·-

a-

"'·

-

·-'-

·-

,,

·

---

-

,.

......

.

--

..

.._

_

c.--

_

:

.._

__

'-

_

®=:

::

._

:_

,.

--

~·

·

~

..

_.

_.,.

....

_,

..

-

~

IOI

HU.]

Location

' •<

•-

·•

...

•

0--.

•

1

0.

-C:

-

d••-

.

•<·

--··-··

..

.,

,

• •

<c

...

..

- - •

-•

.

--

·-

..

."

-··

·-··

ff

:.-;~

,_ ,_

..

...

,.

_.

,_

...

~

....

...

(@

Headlight

LH

(

Wiring

routing

com·)

ponents listed in

alphabetical order

@ Engine

Room

Main

Wire &

Junction

Block

No

. 2

I

E1

IEngine

Room

Main

Wire &

Cowl

Wire

14

~

REAR

WIND~W

DEF~GGER

7 .

SA

GAUGE

®-

-

-~

@

-

~

®-

-

....

!

®Pin

Number

Numbered

in

order

from

upper

left

to

lower

rig

ht

Female

30A

DEFOG

CB

Numbered

in

oder

from

u

pper

right

to

lo

wer

left

Male

@Male

& female connectors distinguished

by

shape

of

their

in

ternal pins.

•

Al

l

connectors

are shown

from

the

open

end, and

the

loc

k is

on

top.

Female

©Connector

Color

Connectors

not

indicated

are

milky

white

in

color.

ABBREVIATIONS

The

follow

ing abbreviations are used

in

this

manual.

I

A/C

Air

Co

nd

itioner

FL

A/T

Automat

ic Transmission J/B

CB

Circuit

Breaker LH

ECT

:;;::

Electronic

Controlled

Tra

nsmission

MIT

EFI

Elec

tron

ic Fuel

Inject

io

n

O/D

=

DEFOGGER

RELAY

CL

OSED

MITH

IGNITIONS/MAT

IG POSI T

ION

-----®

!ND

DEFOGGER

SIM

ON

@@BLACK

------

---

-©

@Indi

cates

circuit

in

Junction

Bl

ock

No.

3.

Example:

1C indicates

that

it

is

inside

Junction

Block

No

. 1.

®Troubleshooting

Hints

&

Components

Operation

®W

ire

Color

Wire colors are

indicated

by

an alphabetical code.

B Black L

Light

Blue

R Red

BR =

Brown

LG

=

Light

Green V =

Violet

G = Green O Orange W

White

GR

=

Gray

P

Pink

Y =

Yellow

The

firs

t le

tter

indi

cates

the

basic

wire

color

and

the

second

letter

indicates

the

color

of

the

stripe.

Exampl

e:

R-G

~\

?====r

I(

Red

Green

Fusible

Li

nk RH

Right

-hand

Junction

Block

S/W

Switch

Le

ft-ha

nd

vsv

Vacuum

Switching

Valve

Manual Transmission

W/

=

With

Overdrive

W/O

Without

B

HOW

TO

USE

THIS

MANUAL

To

better

understand

how

to

use

this

manual, let's assume

that

the

headlights w

ill

not

light,

and go

through

an actual

troubleshooting

procedure.

CONFIRMATION

OF

TROUBLE

Turn

on

the

headlight switch and check

for

yourself

that

the

hr

jlights

do

not

come

on.

READ

THE

CIRCUIT

DIAGRAM

1. Locate

the

headlight system number

in

the

index and open

the

manual

to

the

page indicated.

(The system number

is

written

in

bold

at

the

top

corner

of

each page).

2. Read

the

circuit

dia!'.lram

to

learn

how

it

works.

3.

Unfold

the

ELECTR

ICA

L

WIRING

ROUTING

page

at

the back

of

the manual.

::ill'"'

l •

Cln•,.;

.' '

H

•M•

~

..

,,,

J/B

No

.

21

Inside

RELAY

LOCATIONS

s 20

®-tLt.r

"Ef

l •

•(

~

..

_

!SA

HEAD

LH

PINPOINT

THE

TROUBLE

If

the

circui

t

is

in

common

w

ith

others

(power

circuit

or

ground

point),

problems

will

occur in some

of

the

others also.

Please

refer

to

POWER SOURCE (System No, 1-2). Since the

headlights are related

to

the

HAZ-HORN,

check

this

circuit.

Okay

......

Trouble

lies

within

the

headlight

circuit.

Bad

....

...

. Check circuits in

common.

1. Inspection

of

Headlight

Circuit

(Returnto

HEADLIGHT

page.)

(a)

Check Headlight Fuse

CD

Accoriding

to

®

of

the

circuit,

the headlight fuse

is

in

J/B

No.

2.

®The

location

of

J/B

No

. 2 can

be

found

by

referring

to

the

RELAY

LOCATIONS

page

just

before

the

ELECTRICAL

WI

RING

ROUTING

page.

®Check

if

either

fuse

is

blown.

(b) Check

if

there is

power

to

No

. 5

of

® .

CD

Turn

the

light

control

switch

to

HEAD

.

® Using a voltmeter, check

for

voltage

as

shown

below.

1

Negative(-)

Probe

.....

Good ground

point

or

negative

battery

terminal.

Positive(

+) Probe .

.....

No.

5

of

® .

M

~"''~:~~

~

......

j

RELAY

t-

gt

It

5 2D

" R

<C

....

3

0

..

LH

oc

N

;;'

2'!

!~

~

,__

5~

-~

....

'

_l

<C

BATTERY

5

IB

Lf-

II

A- L

_!.

..!!!.

" "

"'

....

> > '

"'

II

<C

ccnr16.

s1w1

14(D)

13(

a)l2(

o)

3 D

lB

lG

" OFF

....

'

<C

"'

0

....

" 3 E2

~"'

TAIL

r~

~B

....

HE

AD

0-

I-<>-

---0

'

"'

r

FLASH

"'

<C

~Ii:

4 FJ

~~

LOH

"'"'!"

.,~

<CllaJ

c

~~~

J

HIGH

~~~6

G)

9~1lJ

i1w

201

....

-

~

"' "' G-A

:z

' '

" "

M-B

6

3B

II

J/B

[]

"' "'

"''~~

" '

"

7,

9<f

3

IF

t

J/

B

NO

.I

SET

BOLT

@BROWN

D

..

~

2

i

:::

::_

__

,,

,.

..

I

1-

---

..

-

j

;;;,~;;;

:

...

.•

'

l~

·

-

k~~~:

·

"

:= .

;;.:.

:

::<:

~

1

~:o:;~~.:;-~,.

...

,.,..

~

..

!

,

;;~:=;::.

.

::

·

..

~.

ISA

HEAD

LH

®

HEADLIGHTS

©

V-M

I<

l1

f

~

z

"'

<C

"'

~

"'

"

B

Battery

Voltage

.... ..

Troub

le is past

No

. 5

of

®·

No

Battery

Voltage

...

Troub

le is

before

No

. 5

of®.

CAUTION

:

Insert

the

tester probes

from

the

wire

harness side

of

the

connector.

Consequentl

y,

note

that

the

numbers

wi

ll

be

in

reverse

order

of

that

shown

in

the

illustrat

i

on.

(c) Check

if

there

is

power

to

the

headlights.

CD

From

the

ci

rcuit

we

can

see

that®

is

the

head

li

ght

connector

and

that

there

is

power

from

No.

3

to

2

when

the

headlights are

at

high

beam.

®

Turn

the

light

contro

l

switch

to

HEAD.

@ Place

the

dimmer

swi

tch

at

HI.

vo

l

tmeter,

check

for

voltage

as

shown

below.

{ Negative (- )

probe

. . .

Pos

i

tive(+)

probe

.

..

. Pin

No.

2

of

connect

or

@

No.

3

of

connector@

~e

. . . . .

..

1

.

-~

. oltage

...

.

Trouble

is

in

the

headlight.

Probable defec

ti

ve

ground

past

No

.2

so

make

contact

with

negative lead

to

a

good

ground

point

or

battery

negative

term

inal and

check

for

voltage.

I

Voltage

..

.....

Trouble

is

past

No.

2

of@

.

No

Voltage

.

..

.

Trouble

is

before

No

. 3

of@

CAUTION:

Do

not

check

for

continuity

wh

ile voltage is

applied

or

it

may

result

in

damage

to

the

tester

.

(d)

To

check

the

low

beam, place

the

dimmer

switch

at

LOW

and

perform

the

check

in

the

same sequence.

(e} Check

ground

point

1

The

ground

po

i

nt

is

indicated

by

the

"\/fl

J/B

No.

1

SET

BO

LT

in

the

circu

i

t.

2

The

location

of

the

ground

point

on

the

vehicle can

be

found

by

referring

to

the

same

symbol

"\/fl

in

ELECTRICAL

WIRING

ROUTING.

B HOW

TO

USE

THIS

MANUAL

..

1- 1

~

POWER

SOURCE

(Power

-

Load

Reference)

J/ B

No.2

(Engine

Comp

a

rtmentl

JOA.

RTR R

enact

Con

tr

ol

R~av_Jln

t

~

•

.a

t

•on

Relay No 21

7 SA • CHARGE All

KN

:o

r

• 15A_ H

EA

D

LH

- .

Hod

ll!Jht

ILH)

1

5A

HE

AD

RH

Hodhghr

fRH)

' -

-Tu

r

nS..gn.alFI~

~

+

·

HA

Z HORN Hc;rn,,

Ho

rn

Relay

.- -

Thtt1

O• :

tr

rvrit

Ho

rr1

<.;

ucu

•t

(J

p

en

ing

He

l

ay,

TcCs

~

CU

,

c n

e<:

k

c;;

on

ne

c:u>1

, ISC

Va

lve,

HIA

EF

I VSV (E

GA

, Fuel

P

1

e

~su

r

e

up

and lntokt Air Co

nt

r

ol

I, OX

S

en~or

~cu--

--

-

Clock

ISA

RAO

Q

·N

Q 1

~

M

o

n.tor

Co~

Theh

Dr

1ernent

Coms:iu.!_!

r

__

Au10Ante

nroa

>--

--

Q...t

.....

MT

....... Pi:.

.........

..

1

-2

~

PCJHER

SOURCE

@"""

''

·'"

·B

'-

··-

............

~-

-~

~

~~



. ' .

~IC

•

~

IOf!"

C

•

~~

®

"'

- "

'

""'"

'.· :. : .

·

~

~.

~

::m:

i;.o•

I

' :I•

..

~1

.

"

-

'

~

,.

,

RELAY

LOCATIONS

J/B

No.

2

2. Inspection

of

Common Circu

it

s

(a)

Check

battery

and fusible

link

(b) Check related systems

Check

how

the

HEAD

FUSE

is

the

system.

In system No.

1-1

(POWER SOURCE),

you

will

find

a chart listing the relationship between the fuses and

components. Here we can

see

that

the

HEAD

fuses are

to

their

respective headlights.

(c) Check

the

ci

rcuit

fro

m

the

battery

to

the

HEAD

FUSE.

Q)

In

system No. J-2 (POWER SOURCE), tha

power

circuits

for

all fuses are listed.

The

circuit

between

the

battery

and

HEAD

fuse branches

off

with

fuses

HAZ

-HORN

15A

etc.

®

Turn

on

the

HAZARD

switch

Okay

....

No

troub

le

in

c

ir

cuit

up

to

HAZ

-

HORN

junction.

Bad

..

.

...

Trouble

lies between fusible l

ink

and

J/B

No. 2.

(d)

Check

the

HEADLIGHT

RELAY

(Return

to

HEADLIGHT

page)

1 The

circuit

shows

th

at

the

HEADLIGHT

RELAY

is

in

J/B

No

.

2.

2 Installation

of

the

relay can

be

found

by

referring

to

the

RELAY

LOCATIONS

.

The

HEADLIGHT

RE

LAY

is

located in J/ B

No

. 2 in

the

engine

com

-

partment

as

shown.

3 Check

for

power

to

the headli

ght

relay coil.

Cf

Turn

the headlight switch

to

HEAD.

® Using a voltmeter, check

for

voltage

as

shown

below.

{Negative(- ) Probe

....

No.

6

of@

Positive(+) Probe

.....

No.

2

of

®

Confirm

th

at there

is

voltage

~·:::~·"

·

-

~

·~

-t-

-®.-

rt

~~·

~

SYSTEM I

ND

EX

'"

H

!AD

,.

®

HE

A

Dt.

IGHTS

TOYOTA

SUPRA

r

SY

STEMS

1987

Mode4

(Pa9f

1 to Page81

f-

--

LOCATION SYS':'

IE

MS

L

O

CATIO~

~

1.1

. a.J

~

...

--

B

4 Next, check

if

the headlight relay points are closed

and there is power

to

the

No

. 5

of

® .

See

step 1-(b)

If

no voltage, trouble lies

in

the headlight relay.

(e)

Check which systern-s (components)

have

the

same

ground

point.

The

ground points are listed

in

system

No

.

34

(GROUND POINTS). As shown,

GROUND

PO

I

NT

'o/

is

used

for

other components besides the

HEAD

-

LIGHT

SYSTEM, and

it

also connected

to

GROUND

POINT W .

(f)

Check

how

the HEADl,,.IGHT SYSTEM

is

connected

to

the other systems.

1 From the

EWD

SYSTEM

INDEX

(facing the first

EWD), we

can

find

the location

of

the headlight

sy

st

em

within

the

ELECTRICAL

-

WIRING

DIAGRAM

at

the back

of

the

book

(Page

5

of

8,

grid 7).

2 By referring

to

the

ELECTRICAL

WIRING

DIAGRAM,

we can

see

that the

HEADLIGHT

SYSTEM

is

the

TAIL

and

ILLUMINA-

TION SYSTEM.

NOTE:

The relationship between system circuits

1s

n

ot

shown

so

always

confirm

wi

th

the overall w

irin

g

diagram.

(g)

Re-check

After

repair, check

that

the

circuit

functions normal

ly.

Always

follow

the steps described above

to

narrow

do

wn the possible range

of

the trouble.

C TROUBLESHOOTING

S/W2

Ohmmeter

Digital

Type

TOYOTA

hf

<ll'lll(

""

'1$11,.

L O

·]

DC

To

Ignition

S/W

IG

Terminal

Voltmeter

1

Analog

Ty

pe

r",

/

-

v "

o{~

+@

~

10

-@

VOLTAGE CHECK

(a)

Establish

condi

tions

in

which

voltage

is

present

at

the

check point.

Example:

@-

Ignit

ion S/W

on

@-

Ig

nit

i

on

SNV

and S

NV

1

on

©-

Ig

nition

S/W, S/W 1 and Relay

on

(S/W 2

off)

(b) Using a vol

tme

ter, connect the

nega

tive lead

to

a

good ground

point

or

negative

battery

terminal,

and the positive lead

to

the

con

n

ector

or

com-

ponent terminal.

This

check can

be

do

ne

wi

th a

test

light

instead

of

a voltmeter.

CONTINUITY

AND

RESISTANCE CHECK

(a) Disconnect the

battery

termina

l

or

wire

so

there

1s

no

voltage between

the

check

points

.

(b) Contact

the

two

leads

of

an

ohmm

eter to

eac

h

of

the

check points.

If

the

circuit

has

diodes, reverse

the

two

leads and check

again.

When contacting

the

negative lead

to

the

diode

positive

side and

the

positive lead

to

the negative side, there should

be

continu

i

ty.

When contacting the

two

leads in reverse, there should be

no

cont

i

nuity.

(c)

Use

a

volt/ohmm

eter

with

hi!1h

impedan

ce

(10

kn

/

V

minimum)

for

troubleshooting

of

the electrical

circu

it.

Toyota SUPRA 1987 Quick start guide

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