Mazda MX-5 Miata (1997+). Manual - part 76

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

 

1997 Mazda MX-5 Miata 

1997 ELECTRICAL Fuses & Circuit Breakers - MX-5 Miata

  

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

  

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

  

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