DATSUN PICK-UP 1977 Service Manual

INSTALLATION

I
Position
clock
to

cluster
lid
and

install
three
screws

2

Connect
three
wire
connectors
of

clock

to
each
connection
two
to

combination
meter

printed
circuit
one

to
instrument
h
ness

wiring

3

Install
cluster
lid
to
instrument

panel

4

Connect
battery

ground
cable

HEATER

DESCRIPTION

@
Body
Electrical

System

Fig
BE
44
Clock

1
Defroster
nozzle
L
U

2
Deflor
tcr
duct
L
R

3
Heater

control

4

Resistor

5
Heater
motor

6
Heater
case
7
Ventilator
knob

8
Heater
core

9
Conuol
cable

clip

10
Heater
cock

11
Defroster

duct
R
H

12
Defroster
nozzle
R
H

BE687B

Fig
BE
45
Heater
comtruction

BE

26

Operation
of
the
heater
is

control

led

by
two
control
levers
located
on

the
instrument

panel
and
a
hand

op

erated
knob
on
the
center
of
the

heater
unit

The
AIR
LEVER
controls
the
air

intake
valve
and

or
room
valve

by
its

lever

positions
OFF
DEFROST
and

ROOM
through
the
control
cables

The
air
intake
valve
draws
the
fresh

outside
air

from
the
cowl

top
grille

and

supplies
the
air
into
the
heater

unit

The
room
valve
is

located
at
the

bottom
of
the

heater
unit
The
air

coming
through
the
air
intake
valve

opening
is

forced
through
the
heater

core
to
the
room

valve
where
the
air
is

distributed
to
the

floor
outlet
and
or

defroster
outlets

depending
on
the

position
of
the
room
valve

The

VENT
KNOB
is

directly
linked

to
the
vent
valve
which

provides
fresh

air

for
the

passenger
Push
the
knob
all

the

way
in

to

open
the
valve
The
fresh

ventilating
air

comes
out
of
the
heater

center
outlet

The
TEMP
lever
is
a

dual

pur

pose
control
one
is

for

regulating
the

flow
of

engine
coolant

flowing
into
Body
Electrical

System

the
heater
unit
and
the
other
for
the

operation
of
the
fan
motor
When
the

lever
is
in

the
OFF

position
the
water

cock
is

closed
and
the
circulation
of

engine
coolant

through
the
heater
core

stops
When
the
lever
is
slided
to

any

other

position
than
OFF
the
water
cock

opens
in

proportion
to
the

lever

setting
and
allow

engine
coolant

to

flow
into
heater
core

To
control
the
fan
motor

opera

tion

push
or

pull
the
lever
knob
Two

speeds
are

provided
for
the

fan
motor

by
using
a
three

position
switch

FUSE

IOfF
UlwlHI

ON
1

t

f
SWITCH

u

FUSI
BlE

rl
HEATE

R

LINK
SWITCH

is

G
luJ

BATTERY
HEATER
MOTOR

H
EATER
UN
IT

BE868A

Fig
BE
46
Circuit

diagram
of
heater

8E
27

Body
Electrical

System

AIRFLOW

OFF

VENTILATING

Push
Vent
valve

Heater
core

c

n

e
NlL
fAl

u

c
J
u
IUl

g

Push

Pull

DEFROSTING

VENTILATING
HEATING

0
tTIlsl

IU
lI

D
WI
Push
Pull

g

IIt
J

L

I
I

Pull

Pull

DEFROSTING

HEATING

n
C
IU

n

HU

I
ff

UIUI

C
J

CIl

JIlT

Ill

Pull
J

11

Pull

BE397

Fig
BE

47

Airflow

8E

28

HEATER
UNIT
ASSEMBLY

Removal

L
Disconnect

battery
ground
cable

2

Drain

engine
coolant

3

Remove
defroster
hoses

4

Remove
three

cable

retaining

clips
and
disconnect
control
cables

from
valves
and
water

cock

5

Disconnect
two

fan
motor
lead

wires
from
each
connector

6
Disconnect
two
resistor

lead
wires

from
each
connector

7

Disconnect
water
hoses
from
core

and
water
cock

8

Remove
three

heater
housing

mounting
bolts
and

dismount
heater

unit
from
vehicle

Installation

1

Position
heater
unit
under
instru

ment

panel
and
install
three
heater

unit

securing
bolts

2

Install
water
hoses

3
Position
heater

control
cables
to

room
valve
air
intake
valve
and
water

cock

4

Adjust
control
cable

length
for

proper
operation
as

outlined
in

Adjust

ment

5
Connect
fan
motor
wires
and

resistance
wires

to
each
connector

plug

6

Install
defroster
hoses

7

Connect

battery
ground
cable

8
Fill

cooling

systeIT

9
Run

engine
at
2
000

rpm
with

AIR

lever
in

the
HOT

position

Make
sure
that

engine
coolant
is
fIlled

up
to
correct
level

HEATER
CORE

Removal
and
installation

L

Drain

engine
coolant

2
Remove
defroster
hoses

3
Disconnect
water
hoses
from
inlet

and
outlet

pipes
of
heater
core

4

Remove
four

clips
and
front

cover
Body
Electrical

System

BE869A

Fig
BE
48

Removing
front
cov
r

S

Withdraw
heater
core
from
heater

housing

BE870A

Fig
BE
49

Removing
heater
core

6

Install
heater
core
in

the
reverse

sequence
of

removal

FAN
MOTOR

Removal
and
Installation

L
Dismount
heater
unit

assembly

from
vehicle

as
outlined
in
Removal
of

Heater
Unit
Assembly

2
Remove
nine

spring
clips
and

disassemble
heater

housing

3
Remove
fan
from
fan
motor

4
Remove
fan

motor

retaining

screws
and
fan
motor

S
Assemble
heater

housing
and
in

stall
heater
unit

to
vehicle
in
the

reverse

sequence
of
removal

as
out

lined
in

Installation
of

Heater
Unit

Assembly

I

CONTROL
ASSEMBLY

Removal
and
Installation

I
Remove
three
cable

retaining

clips
and
disconnect
control
cables

from
valves
and
cock

BE
29
2

Disconnect
three
lead
wires

from

each
connector

plug

3

Remove
radio
bezel
from
the

front
of
radio

following
instructions

in

steps
I

to
3
in

Removal
of
Radio

4

Remove
heater
control
knobs
and

heater

bezel

5

Remove
two

retaining
bolts
and

heater
control

assembly

6
Install
control

assembly
in
the

reverse

sequence
of

removal
When

connecting
control
cables

to
valves
and

cock

adjust
control
cable

length
as

outlined
in

Adjustment

ADJUSTMENT

AIR
lever

L
Move
AIR
lever
to
the
DEF

position

2

Open
air
intake

valve
and

connect

control

cable
to
air
intake
valve

3

Clip
control
cable
with
cable

re

taining
clip

Fig
BE
50
A
iT
intake
valve

4
Pull
room
valve

upward
and
con

nect
control
cable
to
room
valve

5

Clip
control
cable
with

cable
re

taining
clip

BE871A

Fig
BE
51

Room
valve

TEMP
lever

1

Move
TEMP
lever
to
the

OFF

position

2
Connect
control
cable
to
the
lever

of
water
ock
when

water
cock
lever
is

pulled
forward

fully
closed

3
Install
control
cable
on
water

cock
bracket
with
cable

retaining
clip

SPECIFICATIONS

Item

FAN
MOTOR

Rated

power
consumption

Revolution

rpm

Fan
dia
mm
in

TACHOMETER

The
tachometer
is

optional
on

model
HL620
It
is
an

integral
part
of

the

ignition
system
It
counts
the

pulses
entering
the

ignition
coil
and

indicates
the

number
of

engine
revolu

tions

REPLACEMENT

I

Remove

battery
ground
cable

2

Remve
cluster
lid

following

instructions
iri

steps
I
to
4
of
Removal

in

Combination
Meter
Body
Electrical

System

BE872A

Fig
BE

52
Water
cock

General
use
Extremely
cold

weather

use
2
RG
The
red

with

green

stripe
lead

wire

must
be

connected
to

flat

plate
terminal
at
back
of

combination
meter

3
B

The
black
lead

wire
must
be

connected

to
T

shaped
ter

minal
at
back
of

combination

meter

4

YR

The

yellow
with

red

stripe

lead
wire
must

be
connected

to

pole
terminal
at
back
of

combination
meter

6
Pass

tachllmeter
wires

through

grommet
on
hood
lock
control
wire

and
connect
to

negative
terminal
of

ignition
coil

Notes

a

Fix

grommet
with
an
adhesive

tape

or
a

sealing
compound
to

prevent

water

leakage

b
Attach
tachometer
wires
to
hood

lock

control
wire
with
an
adhesive

tape

BULB
REPLACEMENT

I
Remove
tachometer
as

previously

described

2

Twist
illumination
bulh
socket
at

back
of
tachometer
Bulb
with
socket

can
then
be

easily
removed

3

Remove
bulb

4

Install
new
bulb
in

reverse
se

quence
of
removal

Bulb

wattage

Tachometer
illumination

lamp
3
4W
12V

less
than
36W

3

600

110
433
12V

less
than
SSW

2

SOO

110
4
33

3
Disconnect

four
tachometer
lead

wire
connectors

They
are
connected

to

combination
meter
and
tachometer

cable

4

Remove
three

screws
and
then

remove
tachometer
from

cluster
lid

5

Install
in
reverse

sequence
of
re

moval
When

connecting
lead
wire

note

the

following

1
BW
The
black
with
white

striped

lead
wire

must
be
connected

to

identically
colored
ta

chometer

cable

coming
from

engine

compartment

BE

30
BE965

Fig
BE
53

Tachometer

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

Body
Electrical

System

TROUBLE
DIAGNOSES
AND
CORRECTIONS

HORN

Condition

Horn

does
not

operate

Horn

sounds

continuously

Reduced
volume

and
or
tone

quality
Probable
cause

Discharged
battery

Measure
specific
gravity
of

electrolyte

Burnt

fuse

Faulty
horn
button

contact

Horn
sounds
when

horn

relay
terminal
s

is

grounded

Inoperative
horn

relay

Horn

sounds
when
B
and

H
horn

relay

tenninals
are
connected
with
a
test
lead

Damaged
horn
or
loose
horn

terminal
con

nection

Short
circuited
horn

button
and
or
horn

button

lead
wire

When
light
green
lead
wire
is

disconnected

from
horn

relay
terminal
s

horn

stops
to

sound

Inoperative
horn

relay

Loose
or

poor
connector
contact

Fuse
relay
horn
and
or
horn

button

Damaged
horn

BE
33
Corrective
action

Recharge
or

replace
battery

Correct
cause
and

replace
fuse

Repair
horn
button

Replace
horn

relay

Correct
horn
te
inal
onnection
or

replace

horn

Repair
horn
button
or
its

wiring

Replace
horn

relay

Repair

Replace

Body
Electrical

System

WINDSHIELD
WIPER
AND
WASHER

Condition

Windshield

wiper

motor
does
not

operate

Wiper

operating
speed

is
too
slow

Wiper
speed
cannot

be

changed
correctly

Wiper
motor
continues

to

run
after
switch

is
turned
off
or

wiper

blades
do

not
return

to
correct

position
Probable
cause

Burnt
fuse

Damaged
motor

Check

wiper
motor
as
outlined
in

Inspec

tion

Loose
connection

Faulty
wiper
and

washer
switch

Test

continuity
through
switch
as

outlined

in

Inspection

Open

power
circuit

or

ground
circuit

Damaged
motor

Loose
or

poor
connection

Seized
or

rusted

wiper
linkage

Humming
occurs
on
motor
in

wiper
blade

operating
cycle

Wiper
blades
stick
on
windshield

glass

Raise
arm
and

operate
wiper
without

load

Faulty
wiper
switch

Damaged
motor

Faulty
auto

stop
operation

Poor
connection

Faulty
switch

BE
34
Corrective
action

Correct

cause
and

replace
fuse

Replace
wiper
motor

Repair

Replace

Repair

Replace
motor

Repair

Lubricate

or
replace

Clean
windshield

glass
and
or

replace
wiper

blade

Replace

Replace

Remove

auto

stop
device

cover
and

check

relay
contacts

Clean

dirty
contacts
or

repair
relay
plate

bending
if

necessary

Repair

Replace

Body
Electrical

System

RADIO

Noise

prevention

Position
vehicle
in
an

open
area

away
from
steel

buildings
run

engine
extend
antenna
to
its
maximum

length
set
volume

control

to
maximum
and
set
dial
at
a
medium

point
without

catching
broadcasting
wave

Condition

Ignition

system

Noise
occurs
when

engine
is

op

erated

Charging
system

Sound
of

alternating
current

pre

sents

When

accelerator

pedal
is

depressed

or

released
noise

presents

Supplement
equipment

When

engine
starts
noise

presents

Noise

still

presents
even
after

stop

ping
engine

Notes

a
Be
sure
to
locate

capacitor
as

close

as
to

noise
source
and
connect
in

parallel
Probable
cause
Corrective
action

High
tension
wire

Install
new

high
tension
wire

Ignition
coil
Install
a
0

51lF

capacitor
to

primary
side

terminal
of

ignition
coil

Note
Be

careful
not
to
install

capacitor
to

secondary
or

primary
breaker
side
other

wise

engine
becomes

improper

Install
bond

strap

Distributor
Secure
contact
of
carbon
electric

pole
and

rotor

Eliminate

sharp
tip
on

rotor

pole
or

cap
pole

by

scrubbing
with
a

screwdriver

Check

stagger
between
rotor

and
stator

Alternator
Install
a
0

51lF
capacitor
to

charging
termi

nalA

Note
Do

not

use
a
larger
capacitor

If

capacitor
is

installed
to
terminal
F

alternator
coil
will
be

damaged

Regulator
Install
a
0

51lF
capacitor
to
IGN
terminal

of

voltage
regulator

Operative
noise
of
water
tem

perature
and
fuel

gauges
Install
O

IIlF
capacitor
between
terminal
and

ground
wire

Note
If

a

capacitor
having
a

larger
capacity

is
used
indication
of

gauge
will
be
de

viated

b
Cut
lead
wire

as
short
as

possible

c

Ground
wire
should
be
attached
on

the

body

completely

d
Make
installation
and
connection
securely

e

Carefully
identify

or
OUT

mark
IN

BE
35