1992 MAZDA PROTEGE heater

S DASHBOARD
03UOSX-182
03uosx-18 '3
Installation Note
Dashboard
After installing the dashboard, adjust the control wires of the
heater and blower units.
Mode control wire
1. Set the control lever to the position shown.
2. Set the mode control link to the extreme stop position.
Install the wire loop onto the link.
3. Clamp the wire into position with the clip.
Caution
l Move the Mode lever to verify that it moves the full
stroke between DEF and VENT.
Ret-Fresh selector control wire
1. Set the control lever to the position shown.
2. Set the air-mix control link to the extreme stop position.
Install the wire loop onto the link.
3. Clamp the wire into position with the clip.
Caution
l Move the Ret-Fresh lever to verify that it moves the
full stroke between REC and FRESH.
Temperature control
Temperature control wire
1. Set the control lever to the position shown.
2. Set the temperature control link to the extreme stop posi-
tion. Install the wire loop onto the link.
3. Clamp the wire into position with the clip.
Caution
l Move the Temperature control lever to verify that
it moves the full stroke between HOT and COLD.
S-96

T
ELECTRICAL SYMBOLS
Switches and Relays OUTLINE
There is an NC (normally closed) and NO (normally open) indication for switches and relays which shows
when no change of operation conditions has occurred.
Relay Switch
NO type relay NC type relay NO switch NC switch
Not in operation
(No power supply) +E+ #Fig -o-- -da--
ax ax
STOP
FLOW STOP FLOW
In operation
(Power supply) * !jiij! kiig 6 dLe
cw r”X
FLOW STOP FLOW STOP
Other Electrical Symbols
BATTERY
THERMISTER DIODE CONDENSER
Q
M
MOTOR I
T-10
l-
BODY GROUND
COIL, SOLENOID i
0 8 HOLDER BOX
FUSE
RESISTOR
1
T
FUSIBLE LINK
1 i 1
VARIABLE RESISTOR
LIGHT
HEATER
69G15X-O(

T FUSE AND JOINT BOX
Specifications (Cont’d)
Fuse Color
METER 15A Blue
WIPER 20A Yellow
STOP 20A Yellow
TAIL 15A
Blue
SUNROOF 15A Blue
DEFOG 20A Yellow
HEATER 30A Light green Protected circuit Instrument panel (gauges and warning lamps), Back-up light, Turn signal,
Cruise control system
Windshield wiper and washer
Stoplight, Horn
Taillight, Side marker light, Parking light, Illumination light, License plate light
Sunroof
Rear window defroster
Blower motor
13UOTX-067
L
r 03UOTX-01
1 BL
PULLER
t
L 03UOTX-01
CIRCUIT
BREAKER
RESET BUTTON
03UOTX.01
Removal / Installation
Main fuse
1. Remove the main fuse box mounting bolts.
2. Open the main fuse box lid and remove the bolt.
3. Remove MAIN 80A fuse.
4. Install in the reverse order of removal.
Fuse
When replacing a fuse, use the fuse puller supplied in the fuse
box cover.
CIRCUIT BREAKER
Note
l Push button to reset circuit breaker after operating
dlagnosls of malfunction.
5
T-14

U
HEATER AND
AIR CONDITIONER SYSTEMS
INDEX ...................................................... u- 2
HEATER ................................................
AIR CONDITIONER ................................. ;r ;
TROUBLESHOOTING GUIDE.. .................... U- 4
CIRCUIT DIAGRAM ................................. u- 4
ELECTRICAL TROUBLESHOOTING TOOLS. U- 5
HEATER ................................................... u-20
STRUCTURAL VIEW ................................ u-20
HEATER UNIT ........................................ u-21
BLOWER UNIT ....................................... U-23
HEATER CONTROL UNIT.. ....................... U-26
AIR CONDITIONER .................................... u-30
STRUCTURAL VIEW ................................ u-30
REFRIGERANT SYSTEM ........................... u-31
COOLING UNIT ...................................... U-38
COMPRESSOR ....................................... u-41
MAGNETIC CLUTCH ............................... u-51
RECEIVER/DRIER .................................... U-52
CONDENSER ......................................... u-53
REFRIGERANT LINES .............................. u-54
REFRIGERANT PRESSURE SWITCH No.1.. . U-55
REFRIGERANT PRESSURE SWITCH No.2.. . U-55
A/C RELAY ............................................ U-56
CONDENSER FAN RELAY.. ......................
CONDENSER FAN .................................. z-f;
-
A/C SWITCH .......................................... u-57
23UOUX-001

U INDEX
INDEX
HEATER
1. Heater unit
Removal I Installation . . . . . . . page U-21
Disassembly / Assembly.. page U-22
2. Blower unit
Removal / Installation ,,.....,.....,.... page U-23
Disassembly / Assembly.. . page U-24
Blower motor (in blower unit)
Inspection. ,...._. . . . . . . . page U-25
Resistor assembly (in blower unit)
Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page U-25
K!JOUX 00
3, Heater control unit
Removal / Installation .
Disassembly / Assembly
Blower switch
Inspection .., . ,, ,.
Ret-Fresh wire
Adjustment
Mode wire page U-26
page U-27
page U-28
page U-28
Adjustment ,.,...,...,.,........ . . page U--28
Mix wire
Adjustment .~.. . . I. page U-28
u-2

C
b l HEATER 6 AIR CONDITIONER 1 G
MAIN
I3 Fl
AD FAN
JB-06
4
B/R (F)
1,
1 I
t
G-07
REAR WIPER
IOA
-L/G (F) _fcoJI)
a-07
63
ENGINE
CONTROL UNIT
(SECTION 6-1~. 2bl A/C SWITCH 6 BLOWER SWITCH ILLUMINATION
LAMPS’REFER TO SECTION I-4
RESISTOR ASSEMBLY L/B
-1
r
BjG L)B
(AC9 (AC)
4NT
A/C SWITCH -L/B
4)
6 33
;~~l-bJG FAN
(SECTION B-3.
i-01 CONDENSER FAN (AC) -03 DIODE (AC) G-04 REFRIGERANT G-05 REFRIGERANT G-06 MAGNETIC CLUTCH (AC) G-07 IE) - (AC) CONNECTOR
PRESSURE SWITCH NO.2 (AC) PRESSURE SWITCH NO. 1 (AC)
I I I I
s-10 A/C SWITCH(ACl G-12 BLOWER MOTOR (F) G-13 RESISTOR ASSEMBLY (II
I
I j-14 BLOWER SWITCH (I)

U TROUBLESHOOTING GUIDE
Symptom: Blower motor does not operate.
Normal operation of blower motor
Blower motor speed is controlled by the blower switch and a resistor assembly in the blower unit.
When the blower switch is in the OFF position, the motor ground circuit is open and the blower motor does
not operate. When the switch is in the first (Low) position, current flow from the blower motor is restricted
by the three resistors in the resistor assembly, and the blower motor turns at low speed.
Changing the blower switch to the second (Mid), third (High), or fourth (Super-high) positions causes the
circuit resistance to decrease, and the blower motor speed to become correspondingly faster.
03uoux-005
. HEATER 30A
CIRCUIT
BREAKER
RED BUTTON
23UOUX-01
Step 1 Check circuit breaker
1. Check the circuit breaker.
ircuit breaker] Amperage ( Location
HEATER 1 30A Fuse box
2. If the reset button is not out, go to Step 2.
3. If the reset button is out, check for a short circuit in the har-
ness. Repair as necessary; then depress the reset button
to reset the circuit breaker.
Step 2 Measure voltage at blower motor
1. Turn the ignition switch ON.
2. Turn the blower switch to the fourth position.
3. Measure the voltage at the following terminal wires of the
blower motor connector.
VB: Battery voltage
Wire
Voltage Action
a-) VB Next, check wire (L/B)
ov ReDair wire harness
(Ciicuit breaker-Blower motor)
U-W VB Go to Step 3
ov Replace blower motor
U-6

U HEATER
HEATER
STRUCTURAL VIEW
1, Heater unit 3. Heater control unit
Removal / Installation.. page U-21 Removal / Installation.. ................ page U-26
................
Disassembly I Assembly.. ........... page U-22 Disassembly I Assembly.. ........... page U-27
2. Blower unit inspection ................................... page U-28
Removal I Installation.. page U-23 Adjustment ................................. page U-28
................
Disassembly / Assembly ............. page U-24
Inspection
................................... page U-25
u-20