Mazda Training manual - part 293

AIR CONDITIONING 
05 - Units and Parts Checks

 

 

SG05-2

TC070-15-01H

 
Blower relay 
 
Check continuities Step 1 and 2. 
 

Continuity Step 1: OK / NG 

 

Continuity Step 2: OK / NG 

 
 
Blower motor 
 
Inspect by directly applying battery voltage. 
 

Operation: OK / NG 

 
Resistor 
 
Measure the resistances. 

A – D:                       ohm, Condition OK / NG 

 

A – B:                       ohm, Condition OK / NG 

 

A – C:                       ohm, Condition OK / NG 

 
 
Air intake actuator 
 
Check the air intake actuator for its function by directly applying the battery voltage.  

 

C (B+) – G (Ground): Operation OK / NG 

 

G (B+) – E (Ground): Operation OK / NG 

 
 
Evaporator temperature sensor 
 
Measure the resistance between the evaporator temperature sensor terminals. 
                   

Resistance:                  ohm at               ºC 

 

Resistance:                  ohm at               ºC 

 
 
A/C relay 
 
Check continuities Step 1 and 2. 
 

Continuity Step 1: OK / NG, Continuity Step 2: OK / NG 

 

AIR CONDITIONING 
05 - Units and Parts Checks

 

 

SG05-3

TC070-15-01H

 
Magnetic clutch 
 
Connect battery positive voltage to magnetic clutch terminal A and the A/C 
compressor body to ground. 

 

Operation: OK / NG 

 
 

 
Refrigerant pressure switch 
 
1. Install the manifold gauge. 
2. Disconnect the refrigerant pressure switch connector. 
3. Verify the high-pressure side reading of the manifold gauge and continuity 

between the refrigerant pressure switch terminals. 

 
 

Continuity: OK / NG at               psi 

 

 
Fan switch 
 
Remove the climate control unit. Verify that the continuity between the fan switch 
terminals is as indicated in the table. 
 

Continuity (switch position OFF): OK / NG 

 

Continuity (switch position 1): OK / NG 

 

Continuity (switch position 2): OK / NG 

 

Continuity (switch position 3): OK / NG 

 

Continuity (switch position 4): OK / NG 

 

 

Note 

Refer to the workshop manual to remove the fan switch. 
 

AIR CONDITIONING 
05 - Units and Parts Checks

 

 

SG05-4

TC070-15-01H

 
Climate control unit inspection 
 

Terminal Signal 

name 

Connected 

to 

Measurement 

condition 

Voltage 

(V) 

Remark 

D 

 

B+ 

ROOM 15 A 
fuse 

Under any condition 

 

 

IG SW ON 

 

 

F 

 

IG2 

A/C 10 A fuse
 

IG SW LOCK  
 

 

 

J 

 

GND 

Body ground 

Under any condition 

 

 

L 

 

Sensor GND 

Evaporator 
temperature 
sensor 

Under any condition 

 

 

A/C switch ON, fan 
switch at 1st 

 

 

M 

 

A/C PJB 

 

A/C switch OFF  

 

 

N 

 

Evaporator 
temperature 
sensor input 
 

Evaporator 
temperature 
sensor 
 

Compared with 
temperature detected 
by evaporator 
temperature sensor 

 

 

Rear window 
defroster 
switch ON 

 

 

P 

 
 

Rear 
window 
defroster 
switch 
indicator 
light 

PJB 

Rear window 
defroster 
switch OFF  

 

 

Rear window 
defroster 
switch ON 

 

 

R 

Rear 
window 
defroster 
switch 
 

PJB 
 

Rear window 
defroster 
switch OFF  

 

 

FAN signal 

FAN switch ON 

 

 

T 

 

 

Fan switch 
 

FAN switch OFF  
 

 

 

Headlight switch OFF   

 

U 

TNS signal 

Panel light 
control 
switch 

Headlight switch  
 

 

 

Headlight switch OFF   

 

V 

TNS signal 

PJB 

Headlight switch ON  

 

 

AIR CONDITIONING 
05 - Units and Parts Checks

 

 

SG05-5

TC070-15-01H

 
Instructor Sign-Off: 
Now that you have completed this activity, you should be able to: 

 

Perform checks for A/C components 

This skill will help you evaluate protection devices for correct operation. 
 
Instructor’s initials: