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  9. Toyota SUPRA 1987 Quick start guide

Toyota SUPRA 1987 Quick start guide

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Copyright 2025 Manuals.Online. All Rights Reserved.

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
I
I
I
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
pin
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 .
.....
Pin
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
<C
"'
~
"'
"
B
Battery
Voltage
.... ..
Troub
le is past
pin
No
. 5
of
®·
No
Battery
Voltage
...
Troub
le is
before
pin
No
. 5
of®.
CAUTION
:
Insert
the
tester probes
from
the
wire
harness side
of
the
connector.
Consequentl
y,
note
that
the
pin
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
pin
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.
© Using a
vo
l
tmeter,
check
for
voltage
as
shown
below.
{ Negative (- )
probe
. . .
Pos
i
tive(+)
probe
.
..
. Pin
No.
2
of
connect
or
@
Pin
No.
3
of
connector@
~e
. . . . .
..
1
.
-~
. oltage
...
.
Trouble
is
in
the
headlight.
Probable defec
ti
ve
ground
past
pin
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
pin
No.
2
of@
.
No
Voltage
.
..
.
Trouble
is
before
pin
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
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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
related
to
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
related
only
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
....
Pin
No.
6
of@
Positive(+) Probe
.....
Pin
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
pin
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
related
to
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.