AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
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Is the fault detected and eliminated?
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
7. Diagnosis of failed blower motor operation.
Step Operation
Yes
No
1
① Turn the ignition switch to ON position with the engine off.
② Turn the blower motor switch to each speed position.
Is the blower motor able to operate at each speed position?
Go to “ Fault 8 ” . Go to Step 2.
2
① Turn the ignition switch to OFF position.
②
Disconnect the blower motor.
③ Set a test lamp between blower motor power voltage circuit and
control circuit.
④
Turn the ignition switch to ON position with the engine off.
⑤ Turn the blower motor switch to each speed position.
Is the test lamp on under every speed.
Go to Step 9. Go to Step 3.
3
T
est blower motor power voltage circuit for open circuit or excessive
resistance.
Is the fault detected and eliminated?
Go to Step 15. Go to Step 4.
4
T
est blower motor circuit for open circuit or excessive resistance.
Is the fault detected and eliminated?
Go to Step 15. Go to Step 5.
5
① Turn the ignition switch to OFF position.
②
Connect the blower motor.
③ A ir heater, ventilation and A/C system control module .
④
Turn the ignition switch to ON position with the engine off.
⑤ Turn the blower motor switch to each speed position.
Is the blower motor able to operate at each speed position?
Go to Step 10. Go to Step 6.
6
Check serial data code or check for any fault.
Is there any fault?
Go to Step 7. Go to Step 8.
7
Test circuit.
Is the fault detected and eliminated?
Go to Step 15. Go to Step 8.
8
T
est blower motor switch control circuit for open circuit or excessive
resistance.
Is the fault detected and eliminated?
Go to Step 15. Go to Step 11.
9
Check blower motor for poor contact.
Is the fault detected and eliminated?
Go to Step 15. Go to Step 12.
10
Check air heater, ventilation and A/C system control module for poor
contact.
Is the fault detected and eliminated?
Go to Step 15. Go to Step 13.
11
Check audio system for poor contact.
Is the fault detected and eliminated?
Go to Step 15. Go to Step 14.
12
Replace blower motor.
Is the replacement finished?
Go to Step 15.
13
Replace air heater, ventilation and A/C system control module .
Is the replacement finished?
Go to Step 15.
14
Replace blower switch.
Is the replacement finished?
Go to Step 15.
15 Run the system to check the maintenance result. System is normal. Go to Step 1 .
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