1977 DATSUN PICK-UP belt

Body
Frame

Note
When

installing
emergency

locking
retractor
make
sure
that
it

is
set

vertically

@

I
g@

BF650A

Fig
BF
51
Seat
belt

anchorages

8F
21
INSPECTION
OF

BUCKLE
SWITCH

The
contacts
of
the

buckle
switch

are

normally
closed
When

tongue

latches
the

buckle

tip
end
of

the

tongue
pushes
the

push
rod
to

open

the
switch

contacts

I

Disconnect

battery
ground
cable

2

Disconnect
buckle
switch
wire

harness

3

Using
a
test

light
check
buckle

switch
for

proper
operation
The

light

should

go
out
when

tongue
of
outer

lap
belt
latches
buckle
and

go
on

when
it

unlatches
buckle

Replace
belt

assembly
if

necessary

Note
When

checking
buckle
switch

operation
make
sure

that

power
is

held
below
16
volts

and
13
mA

DESCRIPTION

Cables
are
covered
with
color

coded

vinyl
for

easy
identification
In

the

wiring
diagram
colors
are
indicated

by

one
or

two

alphabetical
letters

It
is
recommended
that
the

battery

be
disconnected
before

performing

any
electrical
service
other
than

bulb

or
fuse

replacement

In
addition
to
fuses
a
fusible
link

has
been

installed
to

protect
wiring

The
fusible
link
functions
almost
the

same
as
a

fuse

though
its
eharac

teristics

are
slightly
different
than

normal
fuses

CABLE
COLORS

Cable
colors
are

indicated

by
one
or

two

alphabetical
letters

B

Black
Be
Brown

G
Green

L
Blue

Lg
Light

green

R

Red
W
White
Y
Yellow

The
main

cable
is

generally
coded

with

a

single
color
The

others
are

coded
with
a

two
tone
color
as

follows

BW

Black
with
white

stripe

gR

Light
green
with
red

stripe

INSPECTION

Inspect
all

electrical

circuits
refer

ring
to

wiring
or

circuit

diagrams

Circuits

should
be

tested
for
conti

nuity
or

short
circuit

with
a

conven

tional
test

lamp
or

low

reading
volt

meter
Before

inspection
of

circuit

ensure
that

I
Each
electrical

component

part
or

cable
is

securely
fastened
to

its
con

nector
or
terminal

2
Each
connection

is

firmly
in

place

and

free
from
rust
and
dirt

3

No
cable

covering
shows

any

evidence
of
cracks

deterioration

or

other

damage

4

Each
terminal

is
at

a
safe

distance

away
from

any
adjacent
metal

parts

5
Each

cable
is
fastened

to
its

proper
connector
or
terminal
Body
Electrical

System

BODY
ELECTRICAL

WIRING

6

Each

grounding
bolt
is

firmly

pbnted

7

Wiring
is

kept
away
from

any

adjacent
parts
with

sharp
edges
or

high

temperature
parts
such

as
exhaust

pipe

8

Wiring
is

kept
away
from

any

rotating
or

working
parts
fan

pulley

fan
belt
etc

9

Cables
between
ftxed

portions

and

moving
parts
are

long
enough
to

withstand
shocks
and

vibratory
forces

Notes

a
Before

starting
to

inspect
and

repair

any
part
of
electrical

system
or

other

parts
which

may
lead
to
a

short
circuit

disconnect
cables
at

battery
terminals
as
follows

Disconnect

cable
at

negative

terminal

and
then
disconnect
cable

at

positive
terminal

Before

connecting
cables
to

battery

terminal
be
sure
to
clean
terminals

with
a

rag
Fasten

cable
at

positive

terminal
and
then

ground
cable

at

negative
terminal

Apply

grease
to

top
of
these

terminals
to

prevent
rust
from

developing
on

them

b
Never

use
a

screwdriver
or
senrice

tool
to
conduct

a

continuity
test

Use
test
leads

c
Never

ground
an

open
circuit
or

circuits
under
no
load
Use

a
test

lamp
12V
3W

or
circuit
tester
as
a

load

FUSE
AND

FUSIBLE

LINK

DESCRIPTION

The
fuse
and
fusible
link

are

protec

tive

devices
used
in

an
electrical
cir

cuit

When
current

increases

beyond

rated

amperage
fusible
metal

melts

and

the

circuit
is

broken

BE
2
MAINTENANCE

INSTRUCTIONS

Fuse

The
fuse

block
is
installed

under

the
instrument

panel
on
the
left

hand

drive

vehicle

BE848A

Fig
BE
1

Fuse
block

When
for
one
reason

or
another

fuse

has
melted
use

systematic
pro

cedure
to
check
and
eliminate
cause
of

problem
before

installing
new
fuse

Notes

a
If
fuse
is

blown
be
sure
to
elimi

nate
cause
of

problem
before
in

stalling
new
fuse

b
Use

fuse
of

specified

rating
Never

use
fuse
of
more
than

specified

rating

Co

Check
condition
of

fuse
holders
If

much

rust
or
dirt
is
found

thereon

clean

metal

parts
with
fine

grained

sandpaper
until

proper
metal
to

metal
contact
is
made

Poor

contact
in

any
fuse
holder
will

often
lead
to

voltage
drop
or

heating
in
the
circuit
and
could

result
in

improper
circuit

operation

Fusible

link

Fusible
link

protects

lighting

starting
charging
and

accessory
cir

cuits

SEAT
BELT

WARNING
SYSTEM

DESCRIPTION

Except
Canada

When

the

ignition
switch
is
turned

to
the
ON

position
the

warning

lamp
comes
on

and
remains
on
for
4

to
8

seconds
The

warning
buzzer

sounds
for
4

to
8
seconds
intermittent

ly
if
the
driver
s
seat
belt
is

not

fastened

properly

The
seat
belt

warning
system
con

sists
of
a
driver
s
belt
switch
a

warning

buzzer
a

warning
lamp
a
timer
unit

and
an

ignition
switch

For
Canada

When
the

ignition
switch
is
turned
Body
Electrical

System

to
the

ON

position
the

warning

lamp
comes
on
and
the

warning
buz

zer
sounds
if
the
driver

s
seat
belt
is

not

fastened

properly

The
seat
belt

warning
system
con

sists
of

a
driver
s

belt
switch

a

warning

buzzer

a

warning
lamp
and
an

igni

tion
switch

REMOVAL
AND

INSTALLATION

Ignition
switch

Refer
to

page
BE
22

for
Removal

and
Installation

Timer
unit

Timer
unit
is
fIXed

on
a
reinforce

ment
behind

glove
box

BE688B

I
Disconnect

battery
ground
cable

2
Remove

glove
box

3
Disconnect
timer
unit

connector

4
Remove
two
screws

retaining

timer
unit
on
reinforcement
Timer

unit
can
then
be
taken

out

S

Installation
is
in
the
reverse
se

quence
of
removal

Warning
buzzer

Warning
buzzer
is
fIxed

on
a
re

inforcement
behind

glove
box

Refer
to
the

preceding
timer
unit

for
Removal
and
Installation
BE282B

Fig
BE
54
Timer
unit

BE967A

Fig
BE
55
Warning
buzzer

Driver
s
seat
belt
switch

I
Remove
seat
belt

ecuring
bolt

2
Disconnect
belt
switch
lead
wire

at
connector

3

Seat
belt
can
then
be
taken
out

4

Installation
is
in
the

reverse
se

quence
ofremoval

BE
31
Warning
lamp
body

Warning

lamp
is

located
on
instru

ment

panel

I
Remove

cluster
lid

2
Disconnect

lead
wire

at
connee

tor

3
Remove

two
screws

retaining

lamp
body

4

Installation
is
in
the

reverse
se

quence
of
removal

WARNING
LAMP
BULB

REPLACEMENT

I
Remove
cluster

lid

2
Twist

warning
lamp
socket

Socket
with
bulb

can
then
be
taken

out

3

Pick

up
bulb

from
socket

4
Install
new
bulb
in
the
reverse

sequence
of
removal

Bulb

wattage

Seat
belt

warning
lamp
I
7W

INSPECTION

Warning
buzzer

Apply
12V

direct
current
between

CD
and

@
and
check
whether
buzzer

sounds
or
not

The
buzzer

must
sound
when

CD

and

@
are
connected
to

power

circuit
See

Figure
BE
55
for

warning

buzzer

Note
Make

sure
that

negative

terminal
of

power
circuit
is

always

connected

to

@
terminal

Timer
unit

Turn

ignition
key
to
the

ON

position
The

voltage
between

@
and

ground
must
be
12V
for
4

to
8

seconds
and
then

go
out
See

Figures

BE
54
and
BE
56

Belt
switch

Test

continuity
between
two
lead

wires
from
seat
belt
switch
with
ohm

meter
or
test

lamp

Body
Electrical

System

Circuit

diagram
of
seat
belt

warning
system

Non
California

modela

except
for
Canada

f
FUSIBLE
LINK

p

c

o

BATTERY

California
modela

f

Canada
modela

o

f
FUSIBLE
LINK

F
9

BATTERY

FUSIBLE
LINK

aP

c

BATTERY
IGNITION
SWITCH
FUSE

lOA

@

@I
TIMER

UNIT
I@

I

WARNING
fS

LAMP

l
2

IGNITION

RELAY

FUSE

1
lC
1
lOA

IGNITION
SWITCH

N

IGN
ITION
SWITCH
FUSE

lOA

BE
32
DRIVER
S

BELT
SWITCH

9

ORIVE
R
S

BELT
SWITCH

9

WARNING
r
i

LAMP

I
2
J

DRIVER
S

BELT

SWITCH

9

WARNING

fS

LAMP

I
2
J

Cf
BUZZER

BUZZER

BUZZER

BE689B

Fig
BE
56
Circuit

diagram
of
seat
belt

warning

system

m
J
c
@
@
r

1
I
I

I
II

U
j
J

r
U

I
IT

L
U
L
L

@

Qj
flll
I

1

I
I

1

lL

to
t
l

Q
1
To
room
Jamp
cable

2
To
light
switch

3
To
fuse

4
To
tachometer
or
clock

5
To
hazard
flasher
unit

6
To
stop
lamp
switch

7
To
ignition
switch

8
To
hazard
switch

9
To
tU
and
dimmer
switch

10
To
check
connector

11
To
AMP
M
T
only

11
To
combination
instrument

Non
California
mode15
except
for
Canada

13
To
combination
meter

14
To
flasher
unit

IS
To
kickdown
switch
AfT
only

16
To
hand
brake
switch

17
To
heater
motor

18
To
illumination
control
rheostat
19
To
wiper
switch
light
switch
illumination

lamp

20
To
wiper
switch

21
To
cigar
lighter

22
To
heater
control
illumination
lamp

23
To
radio

24
To
heater
control

25
To
belt
and
E
G
R
warning
lamp

Non
California
models
or
floor
te
peratuJe

California
models

26
To
heater
control
illumination
lamp

27
To
buzzer

28
To
belt
warning
timer
U
S
A
Olodels

29
To
indicator
lamp
AfT
only

30
To
cooler
harness

31
To
wiptr
motor

32
To
door
switch
R
H

33
To
engine
compartment
harness

34
To
floor
harness

E
m

S
@
o
J
o

Q
m
CD
n

Ql
en
I
i
3

G

t
Q8

Gt

Gt
t
Q
8
Gt
d8

t
QR
8

t
QR

LQR

8
@

RB
1ii
@
@

Gt
tp
o
c
l
T
S
O
i

CD
LQR

t
Q8
RB
8

G
8

Bt
J
rJl
1
3

1
1
0
instrUment
haltl
s

1
To
cooler
harnesS

fo
floor
sensor

California
models
ou
y

4
To
driver
belt
switch

5
To
tank
unit

6
1
0
side
marker
lamp
R
H

7
to
reat
combination
lamp
R
H

To
i
cens
e
amp

9
To
rear
combination
tarnP
L
lt

10
10
side
market
lamp
L
ll

8

@

c
8
ill@

REFRIGERATION

SYSTEM

If

you
were
to

paint
your
finger

with
alcohol

your
finger
would
feel

cold
This
is
because
the

liquid
alcohol

takes
heat

away
from

your
finger

while
it

evaporates
If
a

quickly
evapo

rating

liquid
such
as
alcoliol
is

placed

in
a
container
inside
a
box
the
tem

f

Outside
air

U

Condenser

J6G1
i
i

1
1

t1

1

ilill
I
I

J

JJ
LlJ
i
l

7

U

Receiver

dryer

h

w

t

CONDENSER

The
condenser
is
installed
to
the

front
of
the
radiator

The
heated
and

compressed

refrigerant
gas
from
the
Air

Conditioning

perature
inside
the
box
will

drop
This

is
because
the

alcohol
is

evaporated

absorbing
the
heat
from
the
air

insidc

the
box
If
the

gaseous
alcohol
is

collected
and

cooled
with

cold
water

it
will
be

changed
back

into
a

liquid
by

absorption
of
its
heat

by
the
cold

water

The
cooler

operates
on
this

princi

Compressor

t

q
ttLJ

IrJ

Evaporator
It

J

1

J

f
9

d

lUr

I

Expansion
valve
V7777
J
High
pressure

lLLLLL
l

gas

I
I
High
pressure

liquid

t

u

compressor
condenses
to
a

liquid
by

being
cooled

by
air

passing
between

the
fins
of
the
condenser

1
GJ
7

vlmnn

iii

plI

d1i
1il

Ac459

Fig
AC

3
Condenser

AC3
pIe
The

liquid
used

is
the

refrigerant

R
12

The
heat
inside
the

passenger

compartment
is
absorbed

by

changing

the

refrigerant
from
a

liquid
to
a

gas

and
then

dissipated
to
the

outside

by

changing
the

refrigerant
from

a

gas

back
to
a

liquid

The

refrigeration
system
is

shown

in

Figure
AC
2

Low

pressurt

liquid

1

I
L2
Low

pressure

gas

Inside
air

li

r

L

Blower
motor

AC458

Fig
AC
2

Refrigeration
cycle

COMPRESSOR

The

compressor
is
installed
to
the

side

of
the

engine
and
is
driven

by

crank

pulley
through
a
belt
The

refrig

erant

gas
leaving
the

evaporator
is

forced
out
to
the
condenser

by
com

pressor
and
the
low

pressure
refrig

erant

gas
is

compressed
to
a

high

pressure
and

high

temperature

The

driving
force
is
transmitted

by

an
electrical
clutch
Because

engine

rpm
is

very
low

during
idling
the

clutch
will

not
transmit

the

driving

force
thus

ensuring
smooth

engine

idling

REFRIGERAi
H
R
12

COMPRESSOR
OIL

MAINTENANCE

PERIODIC
MAINTENANCE
AND

SEASON
IN

INSPECTION

GENERAL
SERVICE
INSTRUCTION

SAFETY

PRECAUTIONS

EV

ACUA
TlNG
AND

CHARGING
SYSTEM

HANDLING

MANIFOLD
GAUGE

HANDLING
SERVICE
VALVE

HANDLING
CAN
TAP

DISCHARGING
SYSTEM

REFRIGERANT
R
12

The

refrigerant
used
in
the
air

conditioner
is

generally
called
Re

frigerant
12

R
12
No
other

refrig

erant
than
the

above

refrigerant
should

be
used

This

refrigerant
is

usually
available

in
a
small
can
or
a

cylinder
In

either

case
it

is

liquefied
under

high
pressure

in
the
container

Refrigerant

evaporates
easily
has
a

low

evaporation
point
and
moreover

since
the
latent

heat
of
the

refrigerant

is

large
it

can
abSorb

a

large
amount

of
heat

wh

err
e

vaporating
Extreme

care
must
be
exercised
when

handling

the

refrigerant

COMPRESSOR
OIL

The
SUNISO
5GS
or
SUNISO

351

should
be
used
as

refrigeration

lubricant

Mixing
of
the

two
is

allowable

The

refrigeration
lubricant
should

be
used
to
assure
the
successful
com

pressor
operation
Use
of
oils
other

than
recommended
or

mixing
of
the

oil

with
other
oils
would
cause

chemical
reaction

or
lead
to
lowered

viscosity
or
deficient
lubrication

The
oil

absorbs
moisture
as
it

con

tacts

the
air
This

points
out
the
need

for

care
not
to

expose
it

to
atmos

phere
for
an

extended

period
of
time
Air

Conditioning

GENERAL
SERVICE

CONTENTS

EVACUATING
SYSTEM

CHARGING
REFRIGERANT

CHECKING
FOR
LEAKS

HALIDE
LEAK

DETECTOR

ELECTRIC
LEAK

DETECTOR

REFRIGERANT
LEVEL
CHECK

SIGHT

GLASS

PERFORMANCE
TEST

COMPRESSOR
OIL
LEVEL
CHECK

PERFORMANCE
TEST

REFRIGERANT

LEAKS
AC
8

AC

8

AC
8

AC
8

AC
8

AC
9

AC
9

AC
9

AC10

AC

11

AC
12

MAINTENANCE

PERIODIC
MAINTENANCE

AND

SEASON
IN

INSPECTION

Both

periodic
maintenance
and

season
in

inspection
are

most
essential

to
enable
the
air

conditioner
to

give

full

performance

Perform
the

following
checks

Start

engine
and

check

refrigerant

level

through
sight
glass
on

receiver

dryer
For

details
refer
to

relative

topics
under

Refrigerant
Level

Check

2
Check
the
entire

sysiein
for

sign

of

refrigerant
leaks

Refer
to
relative

topics
under

Checking
for

Leaks

and

Refrigerant
Leaks

If

any
trace
of
oil
is

noted
at

and

around
connection

fittings
it
is
a

sure

indication

that

refrigerant
is

leaking

This
condition

can
be
corrected

easily

by
retightening
the

joints
If

any
joint

on
line

is

suspected
of
small
amount
of

leakage
use
a
leak

detector
to

locate

leaking
points

3
Check

compressor
drive
belts

for

proper
deflection

Season
off

Observe
the

following
maintenance

tips
to
allow

the
air

conditioner

to

operate

normally
in

the
next

season

I

Keep
the
entire

system
free
from

AC
8
AC12

AC

13

AC15

AC15

AC16

AC

16

AC16

AC
17

AC17

AC
17

AC18

refrigerant
leakage
by

periodically

checking
for

refrigerant
gas
leak

even

out
of
season

2

Turn
the

compressor
for
10

minutes

at
least
once
a
month

by

running
the

engine
at
1

500

rpm

c
ENERAL
SERVICE

INSTRUCTION

The

servicing
of
the
air
conditioner

should
be
carried
out

only
by
well

trained
servicemen
This

chapter
de

scribes
essential

points
of

servicing

Jf

a

Jarge
amount
of

dirt
and
sand

enter

the

system
they
will
be

carried
with

refrigerant
and

may

clog
the

system
or
scratch

rotating

parts
This

points
out
the
need
for

care
in

servicing
the

system
That

is

disconnecting

joints
should
be

carried
out

in
a
dean

place

Water
should
not
be
allowed
to

get

inside
the

system
The

refrigerant

does
not

readily
mix

with
water

However
the

presence
of
even
a

minute

amount
of

water
will
cause

a
chemical
reaction

at

high
tem

perature
which
will
in

turn

produce

hydrochloric
acid

HCl
Since

hydrochloric
acid
is

highly
corro

sive
to
metals
the
aluminum
and

copper
piping
etc
will
become

corroded
and
the

refrigeration

system
will
become

clogged