1987 MAZDA 626 heater

HEATER 15
DEF mode
Type A
i ii—ii—ir-innnnnnnnn,
-H v-J/ ^J & w iHBa
4
Cfij O
• OFF 1-^3 4 LA^CJ
IQECO I
Type B
-v' W A/C - EGQK
czi czn 1=3 czi CZ] • ~|
IDi
* CFP*1 3 3 A
' IDI-Warm air
86U15X-202
RATE OF AIR FLOW
MODE AIR VENT OPEN DEF OPEN HEAT OPEN

VENT FRESH
100%
— —

BI-LEVEL
1/2
warm
50%
—
50%

HEAT WARM
20% 80%

DEFROSTER/HEAT WARM
50% 50%

DEFROSTER WARM
—
100%
—
15—119

15 HEATER
LEVER CONTROL TYPE
Type A Temperature control lever
*
REC-FRESH air selector lever
•••DODDQODaaCD °
vV ^ ® •OFF 1 7 3 4
Mode control lever
•
OFF
4 [Art]
BE CO
Fan speed control switch
86U15X-203
86U15X-204
69G15X-203
Adjustments
Air-mix door control wire
1 .Set temperature control lever at MAX-COLD po-
sition.
2. Connect and clamp the control wire with the shut-
ter lever on the heater unit all the way to the right
side.
Caution
Move the temperature control lever to be sure
the wire is attached. Also, be sure it can move
the full stroke between HOT and COLD.
Mode control wire
1. Set mode control lever to DEF position.
2. Connect and clamp the control wire with the shut-
ter lever on the heater unit at its closest point.
Caution
Move the mode lever to be sure the wire is at-
tached. Also, be sure it can move the full
stroke between DEF and VENT.
REC-FRESH air selector wire
1. Set the selector lever to REC position.
2. Connect and clamp the control wire with the shut-
ter lever on the blower unit at its closest point.
Caution
Move the rec-fresh lever to be sure the wire
is attached. Also, be sure it can move the full
stroke between REC and FRESH.
86U15X-205
15—120

HEATER 15
LOGICAL CONTROL TYPE
Type B
Mode control switch REC-FRESH air selector switch
W ^ W cOD A'C - ECOH
du tzzi
J|T OFF 13 3 4.
Temperature control lever Fan speed control lever
REC-FRESH air select motor
AIR-MIX motor
MODE control motor
Outline of Components
69G15X-207
Part Name Description
Logical control switch
One-touch, push type, mode control switch

MODE control motor
Controls
air
outlet
for
each mode
Drives VENT, HEAT and DEF doors

AIR MIX motor
Controls
air
outlet temperature
by
operating the
air
mix doors

REC-FRESH air select motor
Controls intake
air by
driving the rec-fresh
air
select door

15—121

15 HEATER
Circuit Diagram
15—122

HEATER 15
LOGICON SWITCH
Inspection
b d f h
I? c V Note
a) Remove the logicon switch from the vehicle.
b) Supply 12V as shown in the figure.
c) Check each circuit.
B
lA
DiF H J LjN pIr T V B
lA c|e G I XIM 0|Q S w
86U15X-207
Checking REC-FRESH Air Selector Circuit
1. Connect a jumper wire between M terminal and
L terminal.
Connect a resistance (at least
1
kfi) between
B
ter-
minal and 0 terminal, and check the voltage be-
tween these terminals using a voltmeter.
Terminals Voltage
B - 0 Approx. 12V
86U15X-208
d I
J X J

~Sfr
_ „ — —
2. Connect a resistance (at least
1
kS2) between d ter-
minal and B terminal, and check the voltage be-
tween d terminal and 0 terminal using a voltmeter.
\ . X ) 0
Terminals Voltage
B - 0 Less than 1V
Voltmeter
86U15X-209
15—123

15 HEATER
86U15X-210
86U15X-211
86U15X-212
3. Check for continuity between N terminal and L ter-
minal with the REC-FRESH selector switch in
FRESH position (out) using an ohmmeter.
4. Check for continuity between P terminal and L ter-
minal with the REC-FRESH air selector switch in
REC position (in) using ohmmeter.
Checking Mode Control Circuit
1. Connect a jumper wire between I terminal and L
terminal,
Connect a resistance (at least 1 kQ) between D ter-
minal and L terminal, and check the voltage be-
tween these terminals using a voltmeter.

Terminals Voltage

D
- L
Approx.
12V
2. Connect a jumper wire between C terminal and L
terminal.
Connect a resistance (at least 1 kfi) between A ter-
minal and L terminal, and check the voltage be-
tween these terminals using a voltmeter.

Terminals Voltage

A
— L
Approx.
12V
86U15X-213
15—124

HEATER 15

Effl
k /
Voltmeter
86U15X-214
d I
k J X
S3
Voltmeter
86U15X-215
[ I H
k J X /
xj;
iD5F]H|j
ll iE;G Ll.i.i..
Ohmmeter
86U15X-216
d C
•W
©
i IL i
X / X
Qi ! i
+
u
Voltmeter
3. Connect a resistance (at least 1 kfi) between d ter-
minal and D terminal, and check the voltage be-
tween D terminal and L terminal using a voltmeter.

Terminals Voltage
D
- L
Less than
1V
4. Connect a resistance (at least 1 kfl) between d ter-
minal and A terminal, and check the voltage be-
tween A terminal and L terminal using a voltmeter.
Terminal Voltage
A - L Less than 1V
5. Check for continuity between each terminal with
following condition using an ohmmeter.

Condition Terminals Continuity
Push the VENT switch J
- L
Yes
Push the B/L switch G
- L
Yes
Push the HEAT switch H
— L
Yes
Push the H/D switch E
- L
Yes
Push the DEF switch F
- L
Yes

Checking Air Mix Control Circuit
1. Connect a resistance (at least 1 kfl) between Q ter-
minal and T terminal.
Set temperature control lever to center position be-
tween MAX HOT and MAX COLD.
Connect a jumper wire between V terminal and U
terminal, and check the voltage between each ter-
minals.

Terminals Voltage
T
- L
Approx.
12V

Q
- L
Less than
1V
86U15X-217
15—125

15 HEATER
86U15X-218
86U15X-219
86U15X-220
r.". 1
T 1 11 1.11 -4
y -L -v* X /
1
C I y
1 A +
Voltmeter
2. Connect a resistance (at least 1 kfi) between Q ter-
minal and T terminal.
Set temperature control lever to center position be-
tween MAX HOT and MAX COLD. Connect a jum-
per wire between V terminal and S terminal, and
check the voltage between each terminal using a
voltmeter.
Terminals Voltage
Q - L Approx. 12V
T - L Less than 1V
3. Connect a resistance (at least 1 kfi) between Q ter-
minal and T terminal.
Set temperature control lever to MAX HOT, and
check that Q terminal voltage is higher than termi-
nal t voltage.
4. Connect a resistance (at least 1 M2) between Q ter-
minal and terminal t.
Set temperature control lever to MAX COLD, and
check that T terminal voltage is higher than Q ter-
minal voltage.
Checking A/C Switch and ECO Switch Circuit
1. Turn the A/C switch off.
Connect a jumper wire between terminal c and ter-
minal L.
Connect a resistance (at least 1 kQ) between each
terminals, and check the voltage between these
terminals.
Terminals Voltage
d-g OV
d - f OV
d - h OV
86U15X-221
15-126