Headlight switch
ON
B+
(Climate control unit-
TNS relay: D-D)
TNS relay
Headlight switch
E
Blower motor
feedback
Power MOS
FET
Fan stopped
B+
1. Wiring harness:
continuity, short circuit
(Climate control unit-
power MOS FET: E-B)
2. Power MOS FET
3. Blower motor
4. Blower relay
5. HEATER 40 A fuse
6. Power MOS FET
replacement
Fan: manual LO
8.17
Fan: manual HI
0.6
F
Panel control
signal
Instrument
cluster
Headlight switch
OFF
0
Wiring harness:
continuity (Climate
control unit-instrument
cluster: F-1F)
Instrument cluster
Climate control unit:
terminal voltage (D)
Headlight switch
ON
2.7
Wiring harness: short
circuit (Climate control
unit-instrument cluster: F-
1F)
G
Actuator
power
Air
intake
actuator
Air mix
actuator
Airflow
mode
actuator
IG SW ON
B+
Wiring harness:
continuity, short circuit
(Climate control unit-air
intake actuator, air mix
actuator, air flow mode
actuator: G-A, A, A)
Air intake actuator
Air mix actuator
Airflow mode actuator
IG SW LOCK
1.0 or
less
H
GND
Body ground
Under any condition
1.0 or
less
Wiring harness:
continuity (Climate
control unit-GND: H-
GND)
I
Plus Signal
-
-
-
-
J
-
-
-
-
-
Wiring harness: short
2007 Mazda MX-5 Miata Sport
2007 HVAC Control System - MX-5 Miata
Microsoft
Thursday, July 09, 2009 2:27:32 PM
Page 28
© 2005 Mitchell Repair Information Company, LLC.