Toyota Previa 1992 User manual

BE-1
BODY
ELECTRICAL
SYSTEM
Page
GENERAL
INFORMATION
...............ccesseseceseseeesseaesvonees
BE-2
POWER:
SOURCE
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BE-6
IGNITION
SWITCH
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une
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soe
BE-9
LIGHTING
SYSTEM
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BE-11
WIPER
AND
WASHER
SYSTEM..........ccccccceseeeeeeeeeenunee
BE-29
COMBINATION.
METER...........cccccccsccscccssescccesseaseeeeeenes
BE-36
DEFOGGER
SYSTEM
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BE-49
POWER
WINDOW
CONTROL
SYSTEM................::00008
BE-52
POWER
DOOR
LOCK
CONTROL
SYSTEM...................
BE-57
SLIDING
ROOF
SYSTEM
................ccsccsseeseseeareseesseceoeus
BE-63
POWER
MIRROR
CONTROL
SYSTEM..............:::00ees00
BE-66
CRUISE
CONTROL
SYSTEM............cc0ccscssssssecseeeesseensees
BE-69
THEFT
DETERRENT
SYSTEM............::ccccceceeeeeeeeaeeeeenens
BE-92
AUDIO)
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eesemerne
BE-112

BE-2
BODY ELECTRICAL SYSTEM — General Information
Example:
Red
861389
Green
Example:
acoon Female
rit2ys stair]
ais
i6
65
4
Male
GENERAL INFORMATION
Wiring color code
Wire colors are indicated by an alphabetical code.
B = Black L = Blue R = Red
BR = Brown LG = Light Green V = Violet
G =Green O = Orange W = White
GR = Gray P= = Pink Y = Yellow
The first letter indicates the basic wire color and the.
second letter indicates the color of the stripe.
Connector
1. PIN NUMBER OF FEMALE CONNECTOR
Numbered in order from upper left to lower right.
2. PIN NUMBER OF MALE CONNECTOR
Numbered in order from upper right to lower-left.
HINT:
When
connectors
with
different
or
the
same
number
of
terminals
are
used
with
the
same
parts,
each
connector
name
(letter
of
the
alphabet)
and
pin
number
is specified.
B
Equal
Amperage
Rating
10 10
|
(A)
-_
(A)
x30
BODY ELECTRICAL SYSTEM — General Information BE-3
e167
High
Current
Fuse
and
Medium
Current
Fuse
EE)
Equal Amps a
Rating
Connector “A”
e.g. A7 = No. 7 pin of connector
=
Connector "A* Wy
AT
Connector *B*
Connector *B*
Connector “A*
{weres
Puller
3.
DISTINCTION
OF
MALE
AND
FEMALE
CONNECTORS
Male and female connectors are distinguished by shape
of their internal pins.
(a) All connectors are shown from the open end, and
the lock is on top.
(b) To pull apart the connectors, pull on the connector
itself, not the wires.
HINT: Check to see what kind of connector you are
disconnecting before pulling apart.
eeu
Pull Up
Press Down
Replacement
of
High
Current
Fuse,
Medium
Current
Fuse
and
Fuse
HINT:
If
replacing
the
fuse
besure
to
replace
it
with
a
fuse of fusible
link with and equal
amperage
rating.
NOTICE:
1.
Turn
off
all
electrical
components
and
the
ignition
switch
before
replacing
a fuse
of
fusible
link.
Do
not
exceed
the
fuse
or
fusible
link
amperage
rating.
2.
Always
use
a
fuse
puller
for
removing
and
insert-
ing
a
fuse.
Remove
and
insert
straight
in
and
out
without
twisting.
Twisting
could
force
open
the
terminals
too
much,
resulting
in
a
bed
connection.
If
@
fuse
or
fusible
link
continues
to
blow,
a
short
circuit
is
indicated.
The
system
must
be
checked
by
a
qualified
technician.
How
to
Inspect
for
System
Inspection
This
inspection
procedure
is
a
simple
troubleshooting
which
should
be
carried
out
on
the
vehicle
during
system
operation
and
was
prepared
on
the
assumption
of
system
component
troubles
(except
for
the
wires
and
connectors,
etc.).
toh
Always
inspect
the
trouble
taking
the
following
items
into consideration.
* Ground point fault
©
Open
or
short
circuit
of
the
wire
harness
*
Connector
or
terminal
connection
fault
+
Fuse
or
fusible
link
fault
NOTICE:
1. This
operations.
Therehor:
due
regard
for
security.
2.
Incase
of
connecting
the
battery
directly,
be
care-
ful
not
to
short
circuit,
and
select
the
applicable
voltage.
an
on-vehicle
inspection
during
system
inspect
the
trouble
with

BE-4
To ignition SW
IG Terminal
Fuse
®
swt Voltmeter
o+ el
Realy v
©
Swa Solenoid
e089
Ohmmeter| ~
LED
ee2427
BODY ELECTRICAL SYSTEM — General Information
Check for Voltage
(a) Establish conditions in which voltage is present
the check point.
Example:
|- Ignition switch and switch 1 (SW1) on.
©- Ignition switch, switch 1 (SW1) and relay
(switch 2 (SW2) off).
{b) Using a voltmeter, connect the negative (-) lead
a good ground point or negative (-) battery tei
nal and the positive (+) lead to the connector
component terminal. This check can be done with
test bulb instead of a voltmeter.
Check for Continuity and Resistance
(a)
Disconnect
the
battery
terminal
or
wire
so
there
no
voltage
between
the
check
points.
{b)
Contact
the
two
leads
of
an
ohmmeter
to
each
the check
points.
If
the
circuit
has
diodes,
reverse
the
two
leads
and
check
again.
’
When
contacting
the
negative
(~)
lead
to
the
diode
pos-
itive
(+)
side
and
the
positive
(+)
lead
to
the
negative
(-)
side,
there
should
be
continuity.
When
contacting
the
two
leads
in
reverse,
there
should
be
no
continuity.
HINT:
Specifications
may
vary
depending
on
the
type
of
tester,
so
refer
to
the
tester's
instruction
manual
before
performing
the
inspection.
Digital Type
BODY ELECTRICAL SYSTEM — General Information
Analog Type
Light
beo8e2
Check LED (Light Emitting Diode) in the same manner as
that for diodes.
*
Use
a
tester
with
a
power
source
of
3V
or
greater
to
‘overcome
the
circuit
resistance.
+
If
a
suitable
tester
is
not
available,
apply
battery
positive
voltage
and
check
that
the
LED
that
the
LED
lights
up.
Disconnect,
Test Light
sw2
4 To Ignition Sw
IG Terminal
Fuse Case
Short ®)
Disconnect
Relay
L shor ©
Disconnect |
Solenoid
ie
BE-5
(c)
Use
a
volt/ohmmeter
with
high
impedance
(10k/V
minimum)
for
troubleshooting
of
the
electrical
circuit.
Check
for
Short
Circuit
(a)
Remove
the
blown
fuse
and
eliminate
all
loads
from the fuse.
(b)
Connect
a
test
bulb
in
place
of
the
fuse.
(c)
Establish
conditions
in
which
the
test
bulb
comes
on.
Example:
- Ignition switch on.
- Ignition switch and switch 1 (SW1) on.
©-
Ignition
switch,
switch
1
(SW1)
and
relay
on
(connect
the
relay)
and
switch
2
(SW2)
off
(or
disconnect switch 2 (SW2)).
(d)
Disconnect
and
reconnect
the
connectors
while
watching the test bulb.
The short lies between the connector where the
test bulb stays lit and the connector where the
bulb goes out.
(e) Find the exact location of the short by lightly
shaking the problem wire along the body.

BE-6
BODY
ELECTRICAL
SYSTEM
—
Power
Source
BODY
ELECTRICAL
SYSTEM
—
Power
Source
BE-7
ee
POWER
SOURCE
Parts
Location
(Cont'd)
Parts
Location
soieekas
MHBGe@OES
=
wo]
[Oooo
}
\
y
|
}
BSE
GSS
SE
TE)
Gs
Ce
ee
f
a
L
t
IN
F
{a
3
Fusible
Link Block
Fuses
Relays
and
Circuit
Breaker
«
Fusible
Link
Block
1.
ST
7.5A
15,
DOME
158
A.
Front
Heater
Relay
2.
IGN
75A
16.
DEFOG
158A
B.
Front
Heater
High
Relay
3.
CHARGE
75A
17.
ECUB
15A
C.
Headlight
Control
Relay
4.
FOG
20A
18.
CIG
15A
DB.
ine
Oil
Level
Relay
5
—
=
19, EFI
15A
E
R
6.
TAIL
15A
20.
TURN
7.5A
&.
A
7.
HAZ-HORN
=
156A
21.
GAUGE
10A
G
Circuit
Breaker
40A
Gc
8,
HEAD
(LH)
15A
22.
FRWIPER
30
H.
Taillight
Control
Relay
9.
HEAD
(LH-UPR)
154
23.
ENGINE
OIL
154,
|.
HORN
Rel
10.
HEAD
(RH-UPR)
15A
24.
RR-WIPER
15
J.
Fog
Ligh
11.
ENGINE
7.54
25.
AC
154
K.
Power
Main
Relay
12.
RADIO
75A
26.
ECUIG
18A
L
CBPOWER
—-30A
13.
STA
75A
27.
FR-WASHER
110A
M.
Door
(CB)
308
14. STOP
208
28
HEAD
(RH)
15
wf
ABS}
“
(w/o
ABS)
A. MAIN 50A
B.
AMI
—
504
&
AMY
50a
Cc
ALT
100A
C.
ALT
100
0.
ABS
60A
Bai
wee
=
EB
AMZ
208
E
am2
208
‘e528 0¢5129,
E6130
—
leesi3:

BE-8
BODY
ELECTRICAL
SYSTEM
—
Power
Source
BODY
ELECTRICAL
SYSTEM
—
Ignition
Switch
BE-9
Wiring
Diagram
IGNITION
SWITCH
Parts
Location
Ignition
Switen
ABS
604
RADIO
7.54
CIG 15A
ECU-IG
158
ENGINE
OIL
154
AC 5A
ENGINE
7.54
GAUGE
104
TORN
3:
Ignition
Switch
para
Key
Unlock
Warning
Switch
FR WIPER
30A
emis
RR
WIPER
154
oe
.
Wiring
and
Connector
Diagrams
‘AM2
208
IGN 7.58
—
[Stecharge
Wetting
Ugh
‘aaa
ai
Key
Unlock
Warning
Switch
CHG
7.54
Fo
S
DOME
Power
Relay
Ignition
POWER
Switch
ALT
100A
AM1
504,
(Medium
Current)’
OO
+
So
4
#
Ignition
Switch
I
DOOR
Key
Unlock
Warning
Switch
So
4
CB
HEATER
Heater
Relay
Ss
|
RR AIC
108,
~~
eesin
er028
ECU-B
154
—¥
Talligtt
Control
Relay
—
TAIL
‘i
ae
A
Parts
Inspection
TAIL
(LH)
154
[
FOG
20A
Ignition
System
DEFOG
15A
INSPECT
SWITCH
+
o~-
(ignition
Switch/
Continuity)
STOP
204
MAIN
—ON-
4
K
FL
SOA
DOME
15A
IX
sonny
Jafalale|7]
9]
Pores
=
|_
Switch
position
\J
|||
if
ahead
“4
Lock
|
EFL TSA
L
jt
ON
-
o+o
if
HEAD
(RH)
BS
+
.
Hi
15a
an
Sota
obs
=
Headlight
Control
Relay
o~0
Li
ata
Ris
Battery)
|
LO
15a
=
TS
HEAD
(LH)
START
|
|
5
HI
15A
ere28
|
=
ONS
if
continuity
is
not
as
specified,
replace
the
switch.
(CANADA)

BODY
ELECTRICAL
SYSTEM
—
Ignition
Switch
Key
Confine
Prevention
System
INSPECT
SWITCH
(Key
Unlock
Warning
Switch/
Continuity)
Terminal
|
5
Le
E2193 0-10-28
‘Switch position
OFF (Key removed)
ON (Key set)
If continuity is not as specified, replace the switch.
BE-11
BODY ELECTRICAL SYSTEM — Lighting System
LIGHTING
SYSTEM
Parts
Location
Junction Block and Relay Block No.1
Ignition Switch
Headlights
Junction Block and Relay Block No.1
light
Control
Relay
it Control Relay
Hazard Warning Switch
Daytime Resistor
Daytime Running Light
Relay No. 4
Light Control Switch
Light Control Rheostat
Daytime Running Light Relay
Front Fog Light Switch

BE-12 BODY ELECTRICAL SYSTEM — Lighting System
Wiring and Connector Diagrams
(Headlight and Taillight System)
BODY ELECTRICAL SYSTEM — Lighting System
BE-13
(Illuminated Entry System)
Hi-Beam Indicator Light
Headlights [
Headlight Control
Relay
Headlight
Dimmer
Relay
To
Front
Fog
Relay
Taillights
= eth) __
van
|
+ --@&
*
From
Taillight
Control
Relay
(w/
Daytime
Running
Light Control Switch and Headlight Dimmer Switch Headlight Dimmer Relay
Connector Connector “B” 2 1
4 3
Taillight Control Headlight Control
Relay Relay
2 1
‘No2908,
vse
—
Be1e39
aez7es
BELe3e
[eo2 e21 5.14.8 a2
—_
_
2
Open
Door
[-
Warning
Light
Room
Front
Room|
—
Light
DOME
Control
Room
Light
Relay
Switch
[—}
a
|
+
4
|
J
[Battery
Diivera)
Switch
+
(Passeng:
|
L
a
+
-
Room
Light
Control
Relay
Courtesy
Switch
(Front
Door)
(Slide
Door)
©
Rear Room
A Light
Ps Stide Door
Courtesy
t Switch
l]
Hf i Ja
Back Door
Courtesy Switch
2) 2) Front Door 3)
Courtesy
(Back
Door)
ale
(Turn Signal and Hazard Warning System)
HAZ-HORN
a ~ Ignition Switch
TURN
Switch
Connector “A”
a
—
ial
FAM?
7
Turn
Signal
Flasher
|
ST
3
c
—To Horn
TT Relay
Ignition Switch
36
517]
8
[10
Hai
OFF
ote
ON
lotete)
jets
|
Switch
S aH) |
Turn id
Signal Lights
Turn Signal Switch
Connector “B”
er028
Besr3e 02
||
|vse2'
eczess
Hazard Warning Switch

BE-14
BODY
ELECTRICAL
SYSTEM
—
Lighting
System
(Front Fog Light System)
sesso
E1647 5:82
Fog Lights
im
=e
Front
Fog
Light
Relay
FOG 2 4 = =< 2a
IN
1 3
gas
Front Fog Light Switch
To Headlight (HI)
Battery
Front Fog Light Switch
BODY ELECTRICAL SYSTEM — Lighting System BE-15
System
Description
DAYTIME
RUNNING
LIGHT
SYSTEM
From Fog Light SW
To Generator Terminal
To illumination Light
From Brake
Warning Light
Brake Fluid Level Warning Switch
[rawlote
ae
Light Control
Switch

BE-16 BODY ELECTRICAL SYSTEM — Lighting System
Operation
1 IGNITION
SWITCH
“ON”
AND
LIGHT
CONTROL
SWITCH
“OFF”
HINT:
If
the
parking
brake
pedal
is
depressed
when
the
engine
is
started,
the
Daytime
Runni
Light
(DRL)
will
not
light
up
after
the
engine
has
started.
Once
the
parking
brake
is
released,
DRL
with
then
light
up
and
will
remain
on
regardless
of
operation
of
the
parking
brake
pedal.
DRL
remain
on until
the
ignition
switch
is turned
off.
‘When
the
switches
are
set,
current
is
led
from
the
battery
to
terminal
2
of
the
running
light
After
engine
running,
because
continuity
is
made
between
terminal
6
and
the
body
ground,
terminal
4 and the body ground of the running
light relay, the taillight
contro! relay and head}
control relay are turned on, so the running
lights will come on.
It is still low-beam headlights which light up, but they are grounded using a special resistor so
they are dimmed to approx. 80% of the normal intensity.
LIGHT CONTROL SWITCH “HEAD”
When the switch is set, continuity is made between terminal 5 and the body ground, and termir
and the body ground of the running light relay. Also, because the continuity is made bi
terminal 6 and the body ground, and terminal 4 and the body ground of the running light relay at
times, the taillights and headlights light up.
HINT: When the headlight dimmer switch is set to “Hi”, continuity is made between terminal 16
the running light relay and the body ground. Also, because continuity is made between terminal
of the running light relay and the body ground, the headlight dimmer relay is turned on. Then
headlights go on at the high beam. \
HEADLIGHT DIMMER SWITCH “FLASH”
When the switch is set, continuity is made between terminal 7 and the body ground, and termi
16 and the body ground of the running light relay. Also, because the continuity is made e
terminal 6 and the body ground, and terminal 17 and the body ground of the running light relay,
headlights flash. |
ENGINE STOPS (IGNITION SWITCH “ON”)
When the engine is stopped, because the continuity between terminal 6 and terminal 13 of the
Tunning light relay remains, so the running lights also remain.
BODY
ELECTRICAL
SYSTEM
—
Lighting
System
BE-17
(Daytime Running Light System) (Cont'd)
HINT: If ignition switch is turned to “OFF, because the continuity between terminal 6
terminal 13 of the running light relay is cut off, so running lights will go off.
Ignition Switch
Headlight Control Relay
028 vez
‘Seraoe 9€2769 se1829
[o182-8 BEI850 ig22
Light
Control
Switch
and
Headlight
Dimmer
Switch
Connector
“A”
Connector
“B”
Taillight Control
Daytime Running Light
No. 4 Relay
\ il
- =
Headlight Dimmer Relay
Daytime Resistor

BE-18
BODY
ELECTRICAL
SYSTEM
—
Lighting
System
BODY
ELECTRICAL
SYSTEM
—
Lighting
System
itis
= 5
F
Troubleshooting
Troubleshooting
(Cont'd)
Problem
Possible
cause
|
Remedy
|
Problem
|
Possible
cause
___-
Remedy
“Page
| Oniy one light does not | Light bulb burned out
| Replace bulb
7
Daytime running light | ECU-B fuse blown
| Replace fuse and check for short | BE-3
Nightup
Socket,
wire
or
ground
faulty
Repair
as
necessary
syetern
DORs
nok
GAUGE
fuse
blown
—————
ils
a
eae
{
operate
ere
T
:
IGN
fuse
blown
Headlights
do not light Fusible link blown
Replace fusible link
|
ic iacen
|
lown
up
Headlight
control relay faulty
Check relay
ate io -
'
ise blown
|
Light
controvdimmer
switch
faulty
|
Check
switch
rt
ba
BE-24
Wintrig’and:ground
tauk
| Gace ae aaceaaany’
Headlight
control relay faulty
Check relay
:
——
pa ih Del
—
t
Taillight control relay faulty
Check relay
BE-24
High beam headlights
| Light control/dimmer
switch
| Check switch
credit
poe
or headlight flashers
faulty
|
i ;
3
do not operate
idvierorounat
fouls
‘eye
pacebea
Ignition switch faulty
Check switch
Beg
a
=
=
Light
control/dimmer
switch
faulty
Check
switch
BE-24
Tail, packing and license | TAIL fuse blown
Replace fuse and check for short
iio ccna
aie
Gate botrmiidip
aE Noe aheuys
Fusible link blown
Replace fusible link
_
Mai
=|
Taillight
control
relay
faulty
Thlac
aay
illuminated
entry
DOME
fuse
blown
Replace
fuse
and
check
for
short
|
BE-3
Light control relay faulty
Ghaskawticht
system does not
Room light control relay faulty
Check relay
BE-25
asia
Door
courtesy
switch
faulty
Check
switch
BE-26
‘Stop lights do not
light
up
Stop lights stay on
Instrument lights do
not light up
{taillight light up)
“Turn signal does not
flash on one side
Turn
signal
donot
operate
Hazard warning lights
do not operate
Wiring or ground faulty
STOP fuse blown
| Stop light switch faulty
Wiring or ground faulty
Stop light switch faulty
Wiring or ground faulty
Turn signal switch faulty
Wiring or ground faulty
Repair
as
necessary
Replace fuse and check for short
Wiring or ground faulty
Repair as necessary
Adjust or replace switch
Repair
as
necessary
| Adjust or replace switch
Repair
as
necessary
Check switch
Repair as necessary
HAZ-HORN fuse blown
Turn signal flasher faulty
Turn signal/hazard switch faulty
Wiring
or
ground
faulty
) HAZ-HORN fuse blown
Turn signal flasher faulty
Turn signal/hazard switch faulty
Wiring or ground faulty
Replace fuse and check for short
| Check flasher
Check switch
Repair
as
necessary
Replace fuse and check for short
Check flasher
Check switch
Repair as necessary