FRONT BLOWER MOTOR INSPECTION

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1.  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

2.  Remove the dashboard under cover. (See DASHBOARD UNDER COVER REMOVAL/INSTALLATION.)

3.  Remove the front blower motor. (See FRONT BLOWER MOTOR REMOVAL/INSTALLATION.)

4.  Connect the front blower motor connector.

5.  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

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

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

8.  Insert the positive (+) lead of the tester into each front blower motor terminal.

9.  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 blower motor. (See FRONT BLOWER MOTOR REMOVAL/INSTALLATION.)

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Terminal Voltage Table (Reference)

Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item (s)
A
GND
Body ground
Under any condition
1.0 or less
•  Related wiring harness
B
Blower fan speed control
Front climate control unit
(See Blower fan speed control signal.)
•  Related wiring harness
•  Front climate control unit
C
B+
Front blower relay
Switch the ignition off
1.0 or less
•  Related wiring harness
•  Front blower relay
•  HEATER 40 A
•  Front body control module (FBCM)
Switch the ignition ON (engine off or on)
B+


Blower fan speed control signal


Fan stopped

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Front blower motor terminal
•  B(+)—body ground(-)
Oscilloscope setting
•  2 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the ignition ON (engine off or on)
Front climate control unit condition
•  switch OFF


Manual 1st

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Front blower motor terminal
•  B(+)—body ground(-)
Oscilloscope setting
•  2 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the ignition ON (engine off or on)
Front climate control unit condition
•  Airflow mode: VENT
•  Air intake mode: RECIRCULATE


Manual 3rd

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Front blower motor terminal
•  B(+)—body ground(-)
Oscilloscope setting
•  2 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the ignition ON (engine off or on)
Front climate control unit condition
•  Airflow mode: VENT
•  Air intake mode: RECIRCULATE


Manual 5th

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Front blower motor terminal
•  B(+)—body ground(-)
Oscilloscope setting
•  2 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the ignition ON (engine off or on)
Front climate control unit condition
•  Airflow mode: VENT
•  Air intake mode: RECIRCULATE


Manual 7th

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Front blower motor terminal
•  B(+)—body ground(-)
Oscilloscope setting
•  2 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the ignition ON (engine off or on)
Front climate control unit condition
•  Airflow mode: VENT
•  Air intake mode: RECIRCULATE