Mazda Training manual - part 288

 

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Mazda Training manual - part 288

 

 

AIR CONDITIONING 
SG02 - Control System [Manual Air Conditioning]

 

 

SG02-3

TC070-15-01H

 
Control System [Full-auto Air Conditioner] 
 
 

 

 
Tick the components that are equipped with only Full-auto Air Conditioner. 
 
…

 1. Air intake actuator 

…

 2. Air mix actuator 

…

 3. Airflow mode actuator 

…

 4. Blower motor 

…

 5. Power MOS FET 

…

 6. Magnetic clutch (Z6) 

…

 7. Magnetic clutch (LF) 

…

 8. Solar radiation sensor 

…

 9. Ambient temperature sensor 

…

 10. Cabin temperature sensor 

…

 11. Evaporator temperature sensor 

…

 12. Refrigerant pressure switch 

…

 13. Climate control unit 

…

 14. A/C relay 

…

 15. Blower relay 

…

 16. PCM (Z6) 

…

 17. PCM (LF) 

…

 18. Main fuse block 

 
 
 
 

AIR CONDITIONING 
SG02 - Control System [Manual Air Conditioning]

 

 

SG02-4

TC070-15-01H

 
Control System Wiring Diagram [Manual Air Conditioner] 
 
 

 

 
 
1. Blower relay 
2. Blower motor 
3. Resistor 
4. Air intake actuator 
5. Evaporator temperature sensor 
6. A/C relay 
7. Magnetic clutch 
8. Refrigerant pressure switch 
9. Main fuse block 
10. Fan switch 
11. Climate control unit 
 
 

AIR CONDITIONING 
SG02 - Control System [Manual Air Conditioning]

 

 

SG02-5

TC070-15-01H

 
Blower relay 
 
Blower relay is classified as Type B as shown in 
the table below. Its function is to be checked by 
measuring the continuities.  
 
 
Type B relay 
 

            * 

                                                                * It requires supplying battery voltage.  
 

 
Service Tip 

Although your multi-meter might have a function to check continuity by giving beep 
sounds, use the range of your multi-meter to check resistance (ohm) when you check 
continuity between the terminals B and D.  This is because your multi-meter may 
determine there is a malfunction due to the combined resistance of the resister and 
coil between the terminals B and D. 
 
 
 
Blower motor 
 
 

 

 

 
Service Tip 

Blower motor can be inspected by directly supplying battery voltage. Connect battery 
positive voltage to blower motor terminal A, connect terminal B to ground, and then 
verify its operation. It should be operated the same as Fan switch is at its position 4. 
 
 
 
 

AIR CONDITIONING 
SG02 - Control System [Manual Air Conditioning]

 

 

SG02-6

TC070-15-01H

 
Resistor 
 
According to the fan switch position, the number of resister connected in series with 
the blower motor varies. The voltage applied to the blower motor changes due to the 
variation. Look at the table below. The more resistance connected in series with the 
blower motor, the less voltage applying to the blower motor, therefore the lower the 
revolution of the blower motor.   
 
 
 
 
 
 
 
 
Provided the measurements are as shown in the table “1”, what do you assume 
resistance of each register? (Complete the table “2”) 
 
Table 1 

Terminal Resistance 

(ohm) 

A-D 0.30 

A-B 0.80 

A-C 3.10 

Table 2 

Resister 

Resistance (ohm) 

A-D  
D-B  
B-C  

 
 
Air intake actuator 
 
Air intake actuator function can be checked 
by directly applying the battery voltage. 
Connect battery positive voltage to air intake 
actuator terminal C (or G), connect terminal G 
(or E) to ground, and verify that the air intake 
actuator operates as shown in the table. 

 
 
 
 

 

 
 
 

 

 

 

 

 

 

 

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