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.
z
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
Connected to
Measurement
condition
Voltage
(V)
Inspection item (s)
1A
Motor
operation
Driver-side front
air mix actuator
Temperature control
dial (driver side):
Moving towards
COLD
1.0 or
less
z
Wiring harness:
continuity, short circuit
(Front climate control
unit-driver-side front
air mix actuator: 1A-G,
1F-F)
z
Driver-side front air
mix actuator
Temperature control
dial (driver side):
Moving towards
HOT
B+
1B
B+
BCM
Under any
condition
B+
z
Wiring harness:
continuity, short circuit
(Front climate control
unit-BCM: 1B-5H)
z
BCM
1C
Motor
operation
Passenger-side
front air mix
actuator
Temperature control
dial (passenger
side): Moving
towards COLD
B+
z
Wiring harness:
continuity, short circuit
(Front climate control
unit-passenger-side
front air mix actuator:
Temperature control
2008 Mazda CX-9 Grand Touring
2008 HVAC Control System (HVAC) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:12:36 AM
Page 35
© 2005 Mitchell Repair Information Company, LLC.
