BLOWER MOTOR INSPECTION

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1.  Disconnect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.)

2.  Remove the blower motor. (See BLOWER MOTOR REMOVAL/INSTALLATION.)

3.  Connect the blower motor connector.

4.  Connect the negative lead-acid battery terminal. (See NEGATIVE LEAD-ACID BATTERY TERMINAL DISCONNECTION/CONNECTION.)

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

6.  Insert the positive (+) lead of the tester into each climate control unit terminal and 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)

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Terminal
Signal name
Connected to
Measurement condition
Voltage (V)
Inspection item (s)
A
GND
Body ground
Under any condition
Approx. 0
•  GND point
•  Related wiring harness
B
S1
Dash-electrical supply unit
(See Blower fan speed control signal.)
•  Related wiring harness
•  Dash-electrical supply unit
C
BATT
Blower relay
Under any condition
B+
•  Lead-acid battery
•  Blower relay


Blower fan speed control signal


Fan stopped

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•  B(+)−body ground(-)
Oscilloscope setting
•  2 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the main power ON (READY off or on)


Lo

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•  B(+)−body ground(-)
Oscilloscope setting
•  2 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the main power ON (READY off or on)
•  Airflow mode: VENT


Hi

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•  B(+)−body ground(-)
Oscilloscope setting
•  2 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
•  Switch the main power ON (READY off or on)
•  Airflow mode: VENT