MAZDA MX-5 1997 Factory Repair Manual

Fig. 7: Locating Trunk Fuse Box
Courtesy of MAZDA MOTORS CORP.

1997 Mazda MX-5 Miata
1997 ELECTRICAL Fuses & Circuit Breakers - MX-5 Miata
Microsoft
Sunday, July 05, 2009 1:54:39 PMPage 6 © 2005 Mitchell Repair Information Company, LLC.

Fig. 8: Identifying Trunk Fuse Box Components & Legend
Courtesy of MAZDA MOTORS CORP.

1997 Mazda MX-5 Miata
1997 ELECTRICAL Fuses & Circuit Breakers - MX-5 Miata
Microsoft
Sunday, July 05, 2009 1:54:39 PMPage 7 © 2005 Mitchell Repair Information Company, LLC.

HEATER SYSTEM
1997 Heater System
DESCRIPTION & OPERATION
Heater case, mounted under center of instrument panel, contains airflow mode doors and air-mix (temperature
blend) doors. See Fig. 1
. Blower case, mounted under right side of instrument panel, contains blower motor,
blower resistor and fresh/recirculated air door. All doors are controlled manually from control panel by cable.
Blower resistors, located on bottom of blower case, determine blower speed. WARNING:To avoid injury from accidental air bag deployment, read and follow all
SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG
SYSTEM procedures in AIR BAG RESTRAINT SYSTEM article in the
ACCESSORIES/SAFETY EQUIPMENT section.
CAUTION: When battery is disconnected, radio will go into anti-theft protection
mode. Obtain radio anti-theft protection code from owner prior to
servicing vehicle.

1997 Mazda MX-5 Miata
HEATER SYSTEM 1997 Heater System

1997 Mazda MX-5 Miata
HEATER SYSTEM 1997 Heater System
Microsoft
Sunday, July 05, 2009 1:46:56 PMPage 1 © 2005 Mitchell Repair Information Company, LLC.
Microsoft
Sunday, July 05, 2009 1:47:02 PMPage 1 © 2005 Mitchell Repair Information Company, LLC.

Fig. 1: Exploded View Of Heater Unit
Courtesy of MAZDA MOTORS CORP.
ADJUSTMENTS
AIRFLOW MODE DOOR
Set airflow mode control lever at vent position. Disconnect control cable at airflow mode door lever. See Fig.
1 . Extend airflow mode door lever until it stops. Attach control cable to door lever. Secure cable using clip.
Ensure control lever slides freely between defrost and vent positions.
AIR-MIX (TEMPERATURE BLEND) DOOR
Set temperature control lever at maximum hot setting. Disconnect control cable at air-mix door lever. See Fig.
1 . Extend air-mix door lever until it stops. Attach control cable to door lever. Secure cable using clip. Ensure
control lever slides freely between hot and cold settings.
FRESH/RECIRCULATED AIR DOOR
Set fresh/recirculated air control lever at fresh air setting. Disconnect control cable at fresh/recirculated air door
lever. Retract recirculated/fresh air door lever until it stops. Attach control cable to door lever. Secure cable
using clip. Ensure control lever slides freely between recirculated air and fresh air settings.
TESTING
BLOWER MOTOR CIRCUIT
1. Check 30-amp HEATER fuse in passenger compartment fuse block. If fuse is okay, go to next step. If
fuse is burnt, check for short circuit in wiring harness and repair as necessary. Replace fuse.
2. Turn ignition on. Turn blower switch to 4th position (high). Using voltmeter, backprobe Blue wire
terminal of blower motor connector on bottom of blower case. If battery voltage exists, go to next step. If
battery voltage is not present, repair wiring harness between circuit breaker or fuse and blower motor.
3. Ensure ignition is on. Backprobe Blue wire terminal of blower resistor 1-pin connector. If battery voltage
exists, go to next step. If battery voltage is not present, replace blower motor.
4. Backprobe Blue/White wire terminal, Blue/Red wire terminal, Blue/Green wire terminal and Blue/Yellow
wire terminal of blower resistor 4-pin connector. If battery voltage exists, go to next step. If battery
voltage is not present at any terminal, replace blower resistor.
5. Turn blower switch to 4th position (high). Backprobe Black wire terminal of blower switch connector. If
battery voltage is not present, go to next step. If battery voltage exists, repair Black wire between blower
switch and chassis
ground. WARNING:To avoid injury from accidental air bag deployment, read and follow all
SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG
SYSTEM procedures in AIR BAG RESTRAINT SYSTEM article in the
ACCESSORIES/SAFETY EQUIPMENT section.

1997 Mazda MX-5 Miata
HEATER SYSTEM 1997 Heater System
Microsoft
Sunday, July 05, 2009 1:46:56 PMPage 2 © 2005 Mitchell Repair Information Company, LLC.

6. Turn ignition blower switch off. Backprobe Blue/White wire terminal, Blue/Red wire terminal,
Blue/Green wire terminal and Blue/Yellow wire terminal of blower switch connector If battery voltage is
not present, repair open wire(s) between blower resistor and blower switch. If battery voltage exists,
check blower motor.
BLOWER MOTOR
Disconnect blower motor 2-pin connector from bottom of blower case. Apply battery voltage across blower
motor terminals. Replace blower motor if it does not operate.
BLOWER RESISTOR
Disconnect blower resistor connectors from blower case. Check continuity, in turn, between Blue wire terminal
of 1-pin connector and each terminal of 4-pin connector. Ensure continuity exists. Replace resistor if continuity
does not exist.
BLOWER SWITCH
Disconnect blower switch connector. Place blower switch in indicated positions, and check continuity between
specified blower switch terminals. See BLOWER SWITCH TEST table. See Fig. 2
. If continuity is not as
specified, replace blower switch.
BLOWER SWITCH TEST
Switch PositionContinuity Between Terminals
Off(1)
Low"A" & "G"
Medium-Low"C", "G" & "H"
Medium-High"E", "G" & "H"
High"B", "G" & "H"
(1)There should not be continuity between any terminals.

1997 Mazda MX-5 Miata
HEATER SYSTEM 1997 Heater System
Microsoft
Sunday, July 05, 2009 1:46:56 PMPage 3 © 2005 Mitchell Repair Information Company, LLC.

Fig. 2: Identifying Blower Switch Terminals
Courtesy of MAZDA MOTORS CORP.
REMOVAL & INSTALLATION
BLOWER UNIT
Removal & Installation
Remove glove box. Disconnect electrical connectors. Loosen seal plate between blower unit and evaporator unit
(if equipped). Remove blower unit bolts and blower unit. Disassemble blower unit to remove blower motor and
blower resistor. To install, reverse removal procedure.
CONTROL PANEL
Removal & Installation
Remove rear center console. Remove vent outlets from center panel. Remove center panel. Remove control
panel screws, and pull control panel from center panel. Disconnect heater control cables. To install, reverse
removal procedure.
HEATER CORE
Removal & Installation
WARNING:To avoid injury from accidental air bag deployment, read and follow all
SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG
SYSTEM procedures in AIR BAG RESTRAINT SYSTEM article in the
ACCESSORIES/SAFETY EQUIPMENT section.

1997 Mazda MX-5 Miata
HEATER SYSTEM 1997 Heater System
Microsoft
Sunday, July 05, 2009 1:46:56 PMPage 4 © 2005 Mitchell Repair Information Company, LLC.

Drain coolant. Disconnect heater hoses at engine compartment firewall. Remove grommets from holes (if
equipped). Remove instrument panel. See INSTRUMENT PANEL
. Remove heater unit. Disassemble heater
unit to remove heater core. See Fig. 1
. To install, reverse removal procedure. Fill cooling system.
INSTRUMENT PANEL
Removal & Installation
Before disconnecting negative battery cable, obtain radio anti-theft code from vehicle owner. Disconnect
negative battery cable. Remove components in the order listed in illustration. See Fig. 3
. To install, reverse
removal procedure.
Fig. 3: Exploded View Of Instrument Panel

Courtesy of MAZDA MOTORS CORP.
WIRING DIAGRAM

1997 Mazda MX-5 Miata
HEATER SYSTEM 1997 Heater System
Microsoft
Sunday, July 05, 2009 1:46:56 PMPage 5 © 2005 Mitchell Repair Information Company, LLC.

1997 Mazda MX-5 Miata
HEATER SYSTEM 1997 Heater System
Microsoft
Sunday, July 05, 2009 1:46:56 PMPage 6 © 2005 Mitchell Repair Information Company, LLC.

Fig. 4: Heater System Wiring Diagram

1997 Mazda MX-5 Miata
HEATER SYSTEM 1997 Heater System
Microsoft
Sunday, July 05, 2009 1:46:56 PMPage 7 © 2005 Mitchell Repair Information Company, LLC.

A/C-HEATER SYSTEM - MANUAL
1997 Manual A/C-Heater System
A/C SYSTEM SPECIFICATIONS
A/C SYSTEM SPECIFICATIONS
DESCRIPTION
Blower assembly, mounted under right side of instrument panel, contains blower motor, blower resistor and
fresh/recirculated air door. Evaporator unit, located left of blower case, contains evaporator, evaporator
thermoswitch and expansion valve. Heater unit, located left of evaporator case, contains heater core, airflow
mode door and air-mix (temperature blend) door.
ELECTRICAL COMPONENT LOCATIONS WARNING:To avoid injury from accidental air bag deployment, read and follow all
SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG
SYSTEM procedures in AIR BAG RESTRAINT SYSTEM article in the
ACCESSORIES/SAFETY EQUIPMENT section.
CAUTION: When battery is disconnected, radio will go into anti-theft protection
mode. Obtain radio anti-theft protection code from owner prior to
servicing vehicle.
ApplicationSpecifications
Compressor TypeNippondenso TV12 Rotary
Vane
Compressor Belt Deflection (1)
New5/16-23/64" (8-9 mm)
Used23/64-25/64" (9-10 mm)
Compressor Oil Capacity (2) 4.4-5.7 ozs.
Refrigerant Capacity21.2 ozs.
System Operating Pressures
High Side200-227 psi (14.0-16.0
kg/cm
2 )
Low Side22-35 psi (1.5-2.5
kg/cm
2 )
(1)Measure with 22-lb. (10 kg) pressure applied halfway between crankshaft pulley and Power Steering
(P/S) pulley or idler pulley (without P/S).
(2)Use ND-Oil 9 refrigerant oil.

1997 Mazda MX-5 Miata
A/C-HEATER SYSTEM - MANUAL 1997 Manual A/C-Heater System

1997 Mazda MX-5 Miata
A/C-HEATER SYSTEM - MANUAL 1997 Manual A/C-Heater System
Microsoft
Sunday, July 05, 2009 1:41:48 PMPage 1 © 2005 Mitchell Repair Information Company, LLC.
Microsoft
Sunday, July 05, 2009 1:41:59 PMPage 1 © 2005 Mitchell Repair Information Company, LLC.