Mazda RX-8 Workshop Manual page 2607

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2011 - RX-8 - HVAC
A/C AMPLIFIER INSPECTION [FULL-AUTO AIR CONDITIONER]
1. Turn the ignition switch to the ON position.
2. Connect the negative (-) lead of the tester to body ground.
3. By inserting the positive (+) lead of the tester into each A/C amplifier terminal, measure the voltage
according to the terminal voltage table.
If there is any malfunction, inspect the parts under "Inspection item(s)".
Terminal Voltage Table (Reference)
Terminal Signal name
Blower motor
1A
feedback
If the parts under "Inspection item(s)" are found to be normal (except for
terminal 1A), replace the A/C amplifier.
For terminal 1A, first try replacing the power transistor. If there is still any
malfunction, replace the A/C amplifier.
Connected to
Blower
motor
Power
Measurement condition
Fan stopped
Fan: manual LO
Voltage
Inspection item(s)
(V)
B+ 1. Related
wiring
harness
9.0
2. Power
transistor
3. Blower
motor
4. Blower relay