Mazda MX-5 Miata (1997+). Manual - part 77

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 Position

Continuity 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

  

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

  

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

  

 

1997 Mazda MX-5 Miata 

HEATER SYSTEM 1997 Heater System