BLOWER FAN CONTROLLER INSPECTION [MANUAL AIR CONDITIONER]

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1.  Switch the ignition ON (engine off or on).

2.  Connect the negative (-) lead of the tester to body ground.

3.  By inserting the positive (+) lead of the tester into each blower fan controller terminal.

4.  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 blower fan controller.

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Terminal Voltage Table (Reference)

Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item (s)
A
Motor operation (-)
Blower motor
Switch the ignition off
1.0 or less
•  Blower motor
•  Related wiring harness
Fan stopped (Switch the ignition ON (engine off or on))
B+
Fan: manual 1st
9.2
Fan: manual 3rd
7.7
Fan: manual 7th
1.0 or less
B
Blower fan speed control
Climate control unit
(See Blower Fan Speed Control Signal)
•  Related wiring harness
•  Climate control unit
C
GND
Body ground
Under any condition
1.0 or less
•  Related wiring harness
D
—
—
—
—
—
E
Motor operation (+)
Blower motor
Switch the ignition off
1.0 or less
•  Blower motor
•  Related wiring harness
Switch the ignition ON (engine off or on)
B+
F
B+
Blower relay
Switch the ignition off
1.0 or less
•  Related wiring harness
•  Blower relay
Switch the ignition ON (engine off or on)
B+


Blower Fan Speed Control Signal


Fan stopped

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Blower fan controller terminal
•  B(+)—body ground(-)
Oscilloscope setting
•  5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•   Switch the ignition ON (engine off or on)


Manual 1st

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Blower fan controller terminal
•  B(+)—body ground(-)
Oscilloscope setting
•  5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the ignition ON (engine off or on)
•  Airflow mode: VENT
•  Air intake mode: RECIRCULATE


Manual 3rd

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Blower fan controller terminal
•  B(+)—body ground(-)
Oscilloscope setting
•  5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the ignition ON (engine off or on)
•  Airflow mode: VENT
•  Air intake mode: RECIRCULATE


Manual 7th

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Blower fan controller terminal
•  B(+)—body ground(-)
Oscilloscope setting
•  5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the ignition ON (engine off or on)
•  Airflow mode: VENT
•  Air intake mode: RECIRCULATE