1973 DATSUN B110 relay

BODY

INSTRUMENT
PANEL

CONTENTS

REMOVAL
BF
42

REMOVAL

Fig
BF
88

Removing
instrument

panel

Note
There
are
two

types
of
instrument

panel
square

type
and
round

type
However
both

of
them

are

removed
and

reinstalled
in
the
same
manner

Disconnect
the

battery
cable
at
the

battery
terminal

2
Disconnect
the

wiring
harness
connector
units

Disconnect
the
instrument
harness
from
the

engine

compartment
harness

Disconnect
the
instrument
harness

from
the
turn

signal

switch

Disconnect
the

instrument
harness

frorn
the
body

harness

Disconnect
the
instrumen
t
harness
connected
to

the

door
switch

stop
lamp
switch
flasher
unit

and

passing

light
relay
option
REINSTALLATION
BF
43

Note
When

disconnecting
the
wiring
harness

recom

mend
to
use

tags
for

identifying
their

relationship

3
Disconnect
cables
for
radio
antenna
and

speaker

4
Remove
the

package
tray
the
shell
cover
and
turn

signal
switch

Note
Work

may
be
carried
out
without

removing
die

steering
wheel
However
it
is
recommended
to

remove
the
steering
wheel
50
that
work
can
be

carried
out
more
easily

5
Disconnect
the

speedometer
cable

from
the

speedometer
unit

6
Disconnect
the
heater
control
cable
at
the
heater

side

Fig
BF
89

Removing
imtrument

panel
Ii

BF
42

BODY

PASSING
LIGHT

SWITCH

The

passing
light
switch
is

incorporated
in
the

grip
end

of
the
turn

signal
switch
lever
and
controls
the
head

lamp

main
beams
With
either
the

lighting
switch
turned
on
or
off
the
head

lamp
main
beams
will

light
while
the

switch

button
is

pushed
in

CB
FUSE

FUSE
P

T

FUSE

L

DI
TCH

ti

r
1

I

Y
fflf

0
00
0
2

ASSIHG

LICENSE
LAMPS

SWITCH
L

TAil
lAMPS

1
I

I
PASSING

LIGHT
RELAY

FRONT
PARKING

LAMPS
LIGHTING
SWITCH

1
NATlON

HEAD
lAMP

nt
OF

LEFT

sIDe
RIGtfT

SIDE

Fig
BE
30
Circuit

diagram
for

passing
light

system

TROUBLE
DIAGNOSES
AND

CORRECTIONS

Head

lamp

Probable
Me

thod
of

Condition

inspection
cause

All

lamps
do

not

light
Blown
off
fuse
or

faulty
contact
Check
the
fuse
block
and
white

cable
for
contact

Check
the
fuse
for

fusing
and

faulty
contact

Faulty
lighting
switch
terminal

connector
Check
the

connector
for
contact

Defective

lighting
switch
Conduct

continuity
test

The
head

lamp
Blown

off
fuse
or

faulty
contact

does
not

light

for
both

high

and
low
beams
Check
the

fuse
for

fusing
and

faulty
contact

Improper
dimmer
switch
contact
Check
the

connector
for
contact

Defective
dimmer
switch
Conduct
continuity
test

BE
12

r
Corrective

action

Repair
as

required

When

fused
detect

and

repair
the
cause

and

replace
the

fuse

Repair
as

required

If
the

ligh

ting
swi
tch

is
defective

replace

When
fused
detect

and

repair
the
cause

and

replace
the
fuse

Repair
as

required

I

f
the
dimmer
switch

is

defective

replace

9HORN
r
I

01

8ATTERY

HI

IGI

s

ILl

C
iORN
BODY

FUSE
H

S
HORN
BUTTON

BGI

J
H

B
S

Il

I
n6lm

I

L
J
L

HORN
RELAY

Fig
BE
3l
Circuit

diagram
for
hom

syrtem

HORN

Removal

Remove
the
connector
loosen
the

fixing
nut
in
the

horn
center
and

remove
the
horn

unit

Adjustment

1

Secure
the

horn
unit
in
a
vise

and
connect
cables
as

shown

in

Pigure
BE
32

AMMETER
110
to
15AI

Isw
f

@

113
I

VOLTMETER

I

15
to

20VI

BATTERY
HORN

Fig
BE
32
Circuit

for
ham

adjustment

2
Set
the

switch
to

ON
and
rnake
sure
that
the

voltmeter
indicates
12
to
12
5

V

3

Listening
the
horn
for
sound
level
volurne

and
tone

adjust
sound

properly
so

that
the
amrneter
indicates
the

rated

amperage
The

adjustment
is

made

by
turning
the

adjust
screw
after

loosening
the
lock
nut
Fig
BE
33

Adjusting
hom
IIOlume

Note
When
the

adjust
screw
is
turned

Clockwise

Counterclockwise
Current
increases

Current
decreases

4

When
a

proper
sound
is

obtained

through
the
above

adjustment
rnake
sure
that
the

proper
sound
can
be

obtained
at

voltage

generated
by
the
alternator
14
to

l5V

5
Lock
the

adjust
screw
with
the

lock
nut

Consumed
current

adjusting
value
A

Sound

Plat

type
Spiral
type

High
H
2
5
390
5

0
440

Low

L
2
5

330
5
0
350

Figures
encircled
in

parenthesis
are
basic

frequencies

Hz

BE

16

BODY
ELECTRICAL

TROUBLE
DIAGNOSES
AND

CORRECTIONS

Condition

The
horn

does

not

operate

The
horn
sounds

continuously

Reduced
volume

and

or
tone

quali

ty
Probalbe

cause

Excessively
discharged

battery

Blown
off
fuse

Improper
horn

button
contact

Defective
horn

relay

Defective

horn

Defective
horn

relay

Short
circuited
horn

button

and

horn

relay
terminal
S

Improper
fuse
wire
contact

Broken
cable

Improper
horn
button
contact
Method
of

inspection

Measure

specific
gravity
of
electro

lyte
Corrective

action

Charge
if

required

Check
the
fuse
for

fusing
and
im

Replace
fuse

proper
contact

The
horn
sounds

though
the
horn

relay
terrninal
S
is

grounded
Check
and

repair

horn
button

The
horn
sounds

though
the
horn

Replace
horn

relay

relay
terrninals
B
and

H
are

short
circuited

The
horn
does
not
sound

though

Replace
horn

the
horn

relay
terminals
B

and

H
are
short
circuited
and
the

porn
still
does
not
sound

though

the

battery
terminal
is
con

nected
to
the
horn
terminal
direct

ly

The

horn
does

not

stop
though
the

Replace
horn

relay

horn

relay
S
terminal
is

discon

nected

When
the
horn

stops
through
the

above
disconnection
check
the

horn
button
unit

particularly
care

fully

BE

17
Repair
horn

relay

terminal
S

Replace
horn

button

Correct

Repair
or

replace
if

required

Repair

d

BODY
ElECTRICAL

When
the

ignition
switch
is
set
to
ON
the

ignition

wa

rning
circuit
is

closed
and
current
flows
flows
from
the

ignition
switch
to
the

warning
lamp
bulb

and

ground

through
the

regulator
When
the

engine
is
started
and
the

generator
comes
into
operation
the

generator
output

current

opposes
the
current
flowing
from
the

warning

lamp
in

effect
it
breaks
the

warning
circuit

ground

connection
and
the

lamp
goes
out

l

r

hffi
u

z
Ignition
switch

I
Q
6

I
0

c

M
1
E

8

ca
i

L

g

PI
lot
c

P

I

j

co

rt
0

relay
E
0

5

y
y
1

N
N
3

Alternator

Regulator

Fig
BE

41
Circuit

of
ignition
warning
system

HAND
BRAKE
WARNING
LAMP

This

lamp
functions
both
hand
brake

warning
larnp
and

BULB
SPECIFICATIONS
service
brake
line

pressure
differential
warning
lamp

When
a

difference
between
front
and

rear
brake
line

pressures
reaches
the
rated

range
13
to
17

kgfcm2
185

to

242
lb

sq
in
the

ground
circuit
for
the

warning
lamp

is

closed
and
the

warning
lamp
lights

IGNITION
SWITCH

WARNING

LAMP

L
E

WARNING

SWITCH

1
SERVICE

BRAKE
LINE

PRESSU
R
E

DIFFERENTIAL

WARNING

J
SWITCH

Fig
BE

42
Circuit

diagram
for
brake

warning

system

tern
Specifications

Square

type
meter
Round

type
meter

Meter
illumination

larnp
VoW
12
3
4
2
12

1
7
3

Turn

signal
pilot
lamp
VoW
12
3
4
2
12
1
7
2

Head

lamp
main
high
beam

VoW
12
3
4

I
12

17
1

pilot
lamp

Ignition
warning
lamp
VoW
123
4

I
12
17
1

Oil

pressure
warning
lamp
VoW
12
3
4

1
12
1
7

1

Hand
brake

warning
lamp
VoW
12
1
7
1

for
U
S
A

CANADA

Clock
illumination

lamp
VoW
123
4
I
12
17
2

Figure
encircled
in

parentheses
indicates
number
of
bulbs
used

BE
21

BODY

ELECTRICAL

Distributor
Secure

ground
of

ignition
coil

Secure
contact
of

carbon
electric

pole
and

rotor

Eliminate
excessive

tip
on
the

rotor

pole
or

cap
pole
by
scrubbing
with

a
screwdriver

Check

stagger
between

rotor
and

stator

Charging

system

Sound
of

alternating
current

pre

sents
Alternator
Install
a
0
5

l
F

capacitor

on

charging
terminal
A

Note
Do
not
use

capacitor
ex

cessively

If

capacity
is
used
ex

cessively
the
alternator
coil

will
be
broken

When

the
accelerator

pedal
is
de

pressed
or
released
noise

presents
Regulator
Install
a
0
5
l
F

capacitor
on
A

terrninal
of
the

voltage
regulator

Supplement
equipment

When

engine
starts
noise

presents

Noise

still

presents
even
after

stopping
the

engine
Operative
noise

of
ther

rnometer
and
fuel

gauge
Install
0
1
l

F

capacitor
between

terminal
and

ground
wire

Note
If

a

capacitor
having
ex

cessive

capacity
is
used
indi

cation
of
meter
will
be
devi

ated

Noise

presents
when
horn
is
blown

Horn
Install
a
0
5

IF

capacitor
on
the

horn

relay
terminal
or
horn

switch

Noise

presents
when
turn

signal

lamps
are

operated
Flasher
unit
Install
a
0

5
l
F

capacitor

Note
a
Be

sure
to
locate

capacitor
most
near

position

of
noise

source
and

connect
in

parallel
completely

d
Make

installation
and

conneCtion

securely

b

Cut
lead

wire
as
short
as

possible

c
Ground
wire
should
be

placed
on
the

body
e

Carefully
identify

marks
IN
or
OUT

BE
33

FUEl

SYSTEM

l

I

@

1J
w

I

I

I

I

1

1
1
t

2

3

4

5

6

7

8

9

10

tt

12
Hi
metal

Heater

Bi
metal

cover

Fast
idle

earn

Bi

metal

Bi

metal

index
mark

Choke

shaft
lever

Choke
valve

Unloader

tang

Vacuum

diaphragm

Throttle
valve

Fast
idle

adjusting
screw
j

@

Fig
EP
21

Construction

of
electric

automatic
choke

Bi

metal
and
heater

Electric
current
flows

through
the
heater

as
the

engine

starts
and
warms
bi

metal
See

Figure
EF
22
The

deflection
of
bi
metal
is
transmitted
to
the

choke
valve

through
the
choke
valve
lever

Ignition
switch
Fuse

Alternator

T

o

o
Auto
choke
relay

Auto

choke
heater

Fig
EF
22
Schematic

drawing
of
electric

automatic
choke
heater

Fast

idle
C3m

The
fast
idle
cam
determines
the

opening
of
throttle

valve

so
as

to
obtain

proper
amount
of
mixture

corresponding
to
the

opening
of
the

choke
valve
which

depends

upon
the
warmed

up
condition
of
the

enigne
Fast
idle

adjusting
screw

This

screw

adjusts
the

opening
of

the
throttle
valve

by

fast
idle

cam

Unloader

When

accelerating
the

car

during
the
warm

up
period

that

is
before
the
choke
valve
does
not

sufficiently

open
this
unloader
makes
the

choke
valve

open
to
a

certain
extent

so
as
to
obtain
an

adequate
air

fuel

mixture

Vacuum

diaphragm

The

moment
when

engine
starts
this

diaphragm
forces

choke
valve

open
to
the

predetermined
extent
so
as

to

provide
necessary
amount
of
air

fuel
mixture

Bi

metaI
index
mark

The
bi

metal
index
mark

is
used
for

setting
the

moment
of
the

bi
metal
which
controls
the

mixing

ratio

required
for

starting
the

engine

EF
13

Charge
relay

SPECIFICATIONS
AND
SERVICE

DATA

TROUBLE
DIAGNOSES

AND

CORRECTIONS
ENGINE
ElECTRICAL
SYSTEM

Reduction

limit

Repair
limit

Repair
accuracy
mm

in

mm
in

mm
in

REGULATOR

CONTENTS

DESCRIPTiON

MEASUREMENT
OF
REGULATING

VOLTAGE

ADJUSTMENT

Voltage

regu
lator
EE
23

EE
24

EE
25

EE
25

DESCRIPTION
I
0

0394

0
3
0
0118

0
05
0
0197

EE
26

EE
26

EE
27

1

I
T
r

@
V
The

regulator
basically
consists

of
a

voltage
regulator

and
a

charge
relay
The

voltage
regulator
has
two
sets
of

contact

points
a

lower
set
and

upper
set
to

control

altemator

voltage
An

armature

plate
placed
between
the

two
sets
of
contacts

moves

upward
or

downward
or

vibrates

The
lower
contacts
when

closed

complete
the

field
circuit
direct

to

ground
and
the

upper
contacts

when
closed

complete
the
field
circuit

to

ground
through

a
resistance

field
coil
and

produces
alternator

output

The

charge
relay
is

similar
in
construction

to
the

voltage

regulator

When

the

upper
contacts
are

closed

ignition
warning

lamp
goes
on
I
Point

gap

2

Lower
contact

3
Armature

4
Core

gap

5
Yoke

gap

6

Connecting
spring

7
Yoke

8

Adjusting
screw

9
Locle
nut
10

Adjust
spring

11
Coil

12

3mmCO
1181
n
dia

screw

13
4
mm
0
1575

in
dia

screw

14
Contact
set

15

Upper
contact

Regulator
model

Applied
alternator
a
Construction

of

voltage
regulator

TLlZ
57

LTl35
13B

I
Point

gap
10
Lock
ut

2

Charge
elay
antact
Ii
Adjust

spring

3

Connecting

sprinl
12
Coil

4
Armature
i3
3
mm

0
1181
dia

5
Core

gap
screw

6
Yoke

gap
14
4mm
O
1575
n

dia

7
Yoke
crew

8

Adju
ting
screw
15
Contact
set

9
Voltap
e

ree
ulaloT
contact

b

Cons
rue

ion
of

charg
relay

Fig
EE
5J
Structural
view
Fig
EE
50
View

of

removing
cover

As

for
the
construction
the

voltage
regulator
is

very

similar
to

the

charge
relay
as
shown

in

Figure
EE
51

EE
23