Mazda CX-9 Grand Touring 2009 Manual page 1714

1. Connect the front climate control unit connector.
2. Turn the ignition switch to the ON position.
3. Connect the negative (-) lead of the tester to body ground.
4. By inserting the positive (+) lead of the tester into each front climate control unit terminal, measure the
voltage according to the terminal voltage table.
If there is any malfunction, inspect the parts under "Inspection item (s)".
If the parts under "Inspection item (s)" are found to be normal, replace the front climate
control unit.
TERMINAL VOLTAGE TABLE (REFERENCE)
Fig. 57: Identifying Front Climate Control Unit Terminal
Courtesy of MAZDA MOTORS CORP.
TERMINAL VOLTAGE REFERENCE
Terminal Signal name
Motor
1A
operation
1B B+
Motor
1C
operation
2008 Mazda CX-9 Grand Touring
2008 HVAC Control System (HVAC) - Mazda CX-9
Measurement
Connected to
condition
Temperature control
dial (driver side):
Moving towards
COLD
Driver-side front
air mix actuator
Temperature control
dial (driver side):
Moving towards
HOT
Under any
BCM
condition
Temperature control
dial (passenger
Passenger-side
side): Moving
front air mix
towards COLD
actuator
Temperature control
Voltage
Inspection item (s)
(V)
Wiring harness:
1.0 or
continuity, short circuit
less
(Front climate control
unit-driver-side front
air mix actuator: 1A-G,
1F-F)
B+
Driver-side front air
mix actuator
Wiring harness:
continuity, short circuit
B+ (Front climate control
unit-BCM: 1B-5H)
BCM
Wiring harness:
B+
continuity, short circuit
(Front climate control
unit-passenger-side
front air mix actuator: