1987 MAZDA 626 Workshop Manual

1 5 CENTRAL PROCESSING UNIT (CPU)
CIRCUIT DIAGRAM
-O-vO
I &
IG key
OFF
n\ Key reminder
Door ajar
warning light vf Door SW
llfl Engine control —_
unitj^"
Buckle SW
W7i
0
o
o
0
o
0
o
o
o
a
Q
u
n
dD
IG key
illumination light
[ Interior light
(f)
(f) (|)
teesy
J
cF Seat belt warning light
o o o 0 o o o
•a-
o o o o o o o
15-42
86U15X-073

CENTRAL PROCESSING UNIT (CPU) 1 5
REMOVAL AND INSTALLATION
1. Disconnect the negative battery cable.
2. Disconnect the CPU connectors.
3. Release the lock and remove the CPU from the
joint box.
4. Install in the reverse order of removal.
ON-VEHICLE INSPECTION
Note: Check the voltage between "a through
I" terminal and ground.
Check the continuity between "m,
n" terminal and ground.
86U15X-075

Terminal Connecting
to
Measurement condition Measurement value
a Interior light and courtesy lights Any time Approx.
12V

b Batterv Anv time Approx.
12V

c No used
— —

d Ground Anv time OV
e Seat belt warning light Ignition switch
ON
Approx.
12V

f Enaine control unit Enaine runnina Approx.
12V

g Key cylinder illumination light Any time Approx.
12V

i Key reminder switch Insert the key into the cylinder
Pull out the key from the cylinder
Approx.
12V

OV
j Ignition switch (ON) Ignition switch
ON

Ignition switch OFF
or
ACC
Approx.
12V

OV
k Ignition switch (ACC) Ignition switch
ON or
ACC
Ignition switch OFF
Approx.
12V

OV
I Light switch (In the combination switch) Turn the light switch ACC and
ON

Light switch OFF
Approx.
12V

OV
m Seat belt switch Seat belt fastened
Seat belt unfastered

OQ

OO
n Door switch Door closed
Door open
OO
on

76G15X-009
15—43

1 5 TURN AND HAZARD LIGHT
TURN AND HAZARD LIGHT
STRUCTURAL VIEW
86U15X-077
15—44

TURN AND HAZARD LIGHT 1 5
CIRCUIT DIAGRAM
86U15X-078
15—45

1 5 TURN AND HAZARD LIGHT
TROUBLESHOOTING
Note
Check the TURN 15A fuse in the fuse box before troubleshooting.

Terminal Voltage
H (BG) 12V

OK

Check the voltage between each terminal
of
flasher unit connector and
a
body ground with each con-dition.
Terminal Condition Voltage
A(B) Any time OV
E (BR) Turn switch
is
Riaht 12V
F (GY) Turn switch
is
left 12V
H (Br) Anv time 12V

OK
Turn function does not operate.

Check the flasher unit. Refer
to
page 15—47

OK

Check the turn signal switch. Refer
to
page 15—14

OK
NG
NG

Check the voltage
at H
(BG) terminal
of
the combina-tion switch (Turn).
Replace the unit.
Replace the switch.

NG
Repair harness. (Fuse box
to
combination switch)
Repair harness.

NG

Terminal Wiring harness
A (B) Flasher unit
to
ground
E (BR) Flasher unit
to
combination switch
F (GY) Flasher unit
to
combination switch
H (Bri Fuse box
to
Flasher unit
Check the lights and wiring harness (Each bulb
to a

body ground)

NG
Replace the lights
or
repair the wiring harness.

OK

Repair harness. (Flasher unit
to
each bulb)
76G15X-045
Hazard function does not operate. (Turn func-tion is normal)

Check the hazard switch. Refer
to
page 15—19,
20
OK
NG
Replace the switch.
Check the voltage
at
each terminal
of
the hazard
switch connector.
Terminal Voltage
B (GR) 12V
D (B) OV

15-46
NG
Repair the wiring harness. (Flasher unit
to
hazard
switch, hazard switch
to
ground)

OK

Check the flasher unit. Refer
to
page 15—47
NG
Replace the unit.

76G15X-046

TURN AND HAZARD LIGHT 1 5
Rapid flashing

Check the lights and wiring harness between each
bulb and
a
body ground (rapid flashing side).

86U15X-081
76G15X-047
INSPECTION
Hazard and Flasher Unit
For LHD
1. Check for continuity between terminals of the haz-
ard and flasher unit.

Terminal Continuity Terminal Continuity Terminal Continuity
a-c X d-e X f-g X
a-d X d-f X f-h X
a-e O d-g X g-a X
a-f O d-h X g-c X
a-g X e-a X g-d X
a-h X e-c X g-e X
c-a
o
e-d X 9-f X
c-d
o
e-f X g-h X
c-e
o
e-g X h-a
O

c-f
o
e-h X h-c
o

c-g
o
f-a X h-d
o

c-h
o
f-c X h-e
o

d-a X f-d X h-f
o

d-c X f-e X h-g
o

O: Indicates continuity
X: No
continuity

Note
Set the tester to X1000Q range.
2. If continuity is not as specified, replace the switch.
For RHD
1. Apply 12V to the "B" terminal of the unit and con-
nect "E" terminal to the ground.
2. Confirm that the two paralleled lamps come on
when connected between the "L" terminal and the
ground.
Caution
Do no reverse the polarity of the electrical
source to the terminals.
76G15X048
15—47

1 5 STOP LIGHT
STOP LIGHT
STRUCTURAL VIEW
86U15X-083
1 Stop light 3- St°P and tail ''9ht checker
2. Stop light switch
15-48

STOP LIGHT 1 5
CIRCUIT DIAGRAM
TROUBLESHOOTING
Note
Check the STOP 15A fuse in the fuse box before troubleshooting.
86U15X-085
15—49