1973 DATSUN B110 Service Repair Manual

All

turn

signal

lamp
do
not

go

out

Flashing
cycle
is

too

low

Turn

signal
lamp

flashing
cycle
is

too

high

Flashing

cycle
of

the

left
or

right

side
turn

signal

lamp
differs

from

that
of
the

right
or

left

side
turn

signal

lamp
Only
left

or

right
side
turn

signal
operates
Faulty
flasher
unit

terminal
con

tact
or
defective
flasher
unit

Defective
turn

signal
switch

Defective
flasher
unit

There
is
a
lam

p
which
does
no
t

flash

Faulty
contact
in

the
circuit

A

lamp
having
wattage
less
than

the

specified
wattage
is
used

Defective
flasher
unit

Short
ircuit

A

lamp
having
wattage
larger
than

the

rated

wattage
is
used

Defective
flasher
unit

Burnt
out

lamp
bulb
filament

Faulty
connect
contact

A

lamp
other
than

specified
is

used
BODY

When

two
lead
wires
of
the

flasher
unit

are
connected
with

the
turn

signal
switch
turned

on

and
the
individual
turn

signal

larnps
light
the
flasher
unit
is

defective

Conduct

continuity
test

Check
the

lamp
for
burnt
out

filament
and

improper
socket

contact

Check
all

lamps
for

operation

Check

lamp
which
does
not

light

for

burnt
out
filarnent
and
defec

tive
socket

Check
both

side

larnps
for

difference
in

brightness

BE
14
Repair
the
connector

terminal
or

replace

the

flasher
unit

If
the
turn

signal

switch
is

defective

replace

Replace
the

flasher

Wlit

Replace
if

required

Repair
as

required

Replace

Replace
the
flasher

writ

Repair
as

required

Replace

Replace
the

flasher

unit

Replace
as

required

Repair
as
required

Replace
with
the

spe

cified
one

Flashing
cycle

varies
BODY
ELECTRICAL

Faulty
contact
of

power
supply

circuit

from

ignition
switch
to

fuse

Tail
and

stop
lamp
license

lamp

back

up
lamp

Condition

Both
left
and

right
lamps
do

not

light
Probable

cause

Blown
off

fuse
or

faulty
contact

Defective

stop
larnp
switch
or

backup
lamp
switch
or

faulty

contact

Stop
larnps
and

backup

lamp
only

Faulty
grounding

Only
one
side

lamp
Burnt
out

lamp
bulb
f1lament

lights

Brightness
of

one

side

lamp
differs

from
the

other

HORN

Removal

Adjustment
Faulty
contact
of
connector
ter

minal
and

or
socket

Faulty
contact
of
connector
ter

minal

and
or
socket

BE
16

BE
16

BE
16
When
the
windshield

wiper

which
uses
the

ignition
for

power

supply
is

operated
flashing
cycle

and

brightness
change

Method
of

inspection

Check
the
fuse
for

fusing
and

faulty
contact

When

two
lead
wires
of
the
switch

are
connected
and
the

lamp
lights

the

larnp
and
circuit

are
normal

All
rear
combination

lamps
do

not

light

HORN

CONTENTS

TROUBLE

DIAGNOSES
AND

CORRECTIONS

BE
15
Repair
as

required

Corrective

action

When
the

fuse
is

fused

detect
and
COf

rect
the
cause
and

replace
the
fuse

Replace
the

switch
or

repair
the

connector

terrninal

Repair
the

grounding

cable
contact

Replace
the

larnp

with
a
new

one

Repair
or

replace

Repair
or

replace
if

required

BE
17

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

METERS
AND
GAUGES

CONTENTS

CLUSTER
LID

Oescri

ption

Removal

SPEEDOMETER

Replacement

FUEL
GAUGE

AND

TEMPERATURE
GAUGE

Description

Replacement
BE
1B

BE
18

BE
18

BE
19

BE
19

BE
19

BE
19

BE
20

CLUSTER
LID

Description

The

cluster
lid
holds
various
rneters

indicators
and

clock
located
around
the

speedorneter
Printed

circuit

board
is

used
at

the
back
of
the

meter
as
shown

in

Figure

BE
38

and
the

printed
circuit

board
is

connected
with

multiple
connectors
Thus
the
meters

Can
be

inspected

and
serviced

extremely
easily
Except
for
the

speed

ometer
all

rneters
are

operated
electrically
The
fuel

gauge

and
therrnometer
are

very
reliable
and

they
are

equipped

with
bimetal
devices

F
a

o

ill
I

1

a

a

Fig
BE
34
Combination
meters

Removal

Disconnect
the

battery
terminal

depressing
the
OIL
PRESSURE
AND

IGNITION
WARNING
LAMPS

HAND
BRAKE
WARNING
LAMP

BULB
SPECIFICATIONS

TROUBLE
DIAGNOSES
AND

CORRECTIONS

Speedometer

Thermometer
and
fuel

meter

Oil

pressure
and

ignition
warning
lamps
BE
20

BE
21

BE
21

BE
22

BE
22

BE
23

BE
25

windshield

wiper
switch

lighting
switch
and
choke
lever

knobs

turn
them
counterclockwise
to

remove

Remove
the

escutcheon

2

Inserting
your
hand

into
back
of
the

cluster
lid

disconnect
the

cigarette
lighter
cable
and

turn
and

remove
the

cigarette
lighter
outer

case

3
Remove
the
radio
and
heater
control
knobs

4
Remove
the
shell

cover
from
the

steering
tube

loosen
the

screws
used
to
secure
the
meter

housing
to
the

instrument

panel
and

remove
the
cluster
lid

5
Pull
out
the
l2

pole
round

shape
connector
and

remove
the

speedometer
cable
union

nut

6
Remove
the

cluster
lid
from

the
instrument

panel

Fig
BE
35

Removing
clllSter
jd

BE
18

BODY
ELECTRICAL

SPEEDOMETER

The

speedometer
is

equipped
with
a
total
odometer

which

records
travelled
distance

Replacement

1

When

removing
the

speedometer
remove
the
cluster

lid

first

Separate
the
combination
meter

housing
from
the

cluster
lid
after

removing
four
screws
and
remove
the

trip

recorder

reset
knob
if

any

2
Unscrew

two
screws
and
remove

the

speedometer

from
the
combination
meter

housing

3

Reinstall
a
new

speedometer
in

reverse

sequence
of

removal

Fig
BE
36

Removing
combination
meter

o

Fig
BE
37

Removing
sp
edometer
FUEL
GAUGE
AND

TEMPE

RATURE
GAUGE

Description

The
fuel

gauge
consists

of
a
tank
unit

located
in
the

fuel
tank

and
fuel
meter
The
tank
unit

detects
fuel
level

with
its

float
converts
fuel
level
variation
to

a
resistance

of
slide
resistor

installed
on
the
float
base

and
thus

controls
current

flowing
to
the
fuel
meter

The

temperature

gauge
consists
of

a
thermorneter
and

thermal
transmitter
located
in

the

engine
block
The

thermal
transmitter
is

equipped
with
a
thermistor
element

which
converts

cooling
water

temperature
variation
to
a

resistance
and
thus
the
thermal
transmitter
controls

current

flowing
to
the
thermometer

The
fuel
rneter
and
thermometer
are

provided
with

bimetal
a
and

heater
coil
When
the

ignition
switch
is

set
to
ON

current
flows
to
the
heat

coil
and
the
heat

coil
is

heated
With

this
heat
the
bimetal
arm
is

bent
and

thus
the

pointer
connected
to

the
bimetal

ann
is

operated

The
characteristics
ot
both

meters
are
same

A

tolerance

may
occur
on
the

thermometer
or

fuel

gauge
due
to

source

voltage
fluctuation
The

voltage

regulator
is
used
to

supply
a
constant

voltage
so
that
the

therrnorneter
and
fuel

gauge

operate
correctly
The

voltage
regulator
is
built
in
the
thermometer

The

operating
part
of
the

regulator
consists

of
a

bimetal
arm
and
a
heater
coil
When
the

ignition
switch
is

turned
on
the
birnetal
arm
is
heated
and
bent

by
the
coil

opening
the

contact

Consequently
current
to
the

coil
is

interrupted
As
the
bimetal

cools
the

contact
closes
The

repetition
of
this

operation

produces
a

pulsating
voltage

of
8V
which
is

applied
to

the

ternperature
and
fuel

gauges

If

both
thermometer
and

fuel
meters

become
defective

at
the

same
time

this

may
be
attributable
to
trouble
in

the

voltage
regulator

BE
19

BODY

REGULATOR

FUSE
M

TEMPE

RATURE

GAUGE
IGNITION

SWITCH

Lf

I

iT
Ji
1M

THERMAL
TRANSMITTER
I

J

0

I
GAUGE
TANK
UNIT

FUEL
TANK

Fig
BE
38
Circuit

diagram
for
fuel
gauge
temperature
gauge
and

voltage

regulator

Replacement

Remove
the

cluster
lid
first

2
Unscrew
two

screws
and
remove
the

thermometer
or

fuel
meter

from
the

combination
meter

housing

3
Reinstall
a
new
meter
in

reverse

sequence
of
removal

Fig
BE
39

Removing
thermometer

OIL
PRESSURE
AND

IGNITION
WARNING
LAMPS

The

engine
lubricating

system
incorporates
an
oil
pressure

warning
lamp
which

glows
whenever

engine
oil

pressure
falls
below
0
4

kg
ern
to
0
6

kg
em
5
7
to
8
5

lb

sq
in

When
the

engine
is

stationary
the

light
glows
with
the

ignition
switch
turned
on
When
the

engine
is

running
and

the
oil

pressure
reaches
the

circuit
is
broken
and
the

light

goes
out

J

u

fj
Warning
lig

2
Fuse

bSM
Q

f

t

J

without

pressu
re
with

pressure

Fig
BE
40
Circuit

of
oil

pressure
warning
system

Ignition
warning
lamp
glows
when
the

ignition
switch

is
set
to
ON
and
the

engine
is
not

operated
or
when
the

generator
fails
to

charge
with
the

engine
operated

BE
20

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