Blower Will Not Operate or Operates at Reduced Speed
Test
No.
Test
Test Procedure
Test Result
Action
1
Is fault 146 s010 02
or 200 s010 02
active?
—
Yes
See fault code tables, in
, for diagnosis.
No
Go to test no. 2
.
2
Check power and
ground.
Disconnect the blower motor
connector.
Turn ignition on.
Check for voltage across pins 3
and 4 of the connector.
NOTE: If system voltage is too
high or too low, this may cause
the blower motor to enter voltage
protection mode. This will cause
the blower to operate at reduced
speed or stop working altogether.
12–17V (should be
approx. battery voltage)
Go to test no. 3
.
0V
Check 30A blower motor fuse in
PDM.
Check blower motor power and
ground circuits for open (circuits
98 and GND).
Repair as necessary, then
go to
test no. 7
.
Less than 12V (not 0)
or more than 17V
Blower has most likely entered
voltage protection mode. Correct
voltage problem as necessary,
then
go to test no. 7
.
3
Check speed control
signal at blower
motor.
Disconnect the blower motor
connector.
Turn ignition on.
Check voltage between
connector pin 6 and ground while
rotating the blower control switch
from off to full speed. The
voltage should be approximately
0V (off) to 5V+ (high).
Voltage full range (0–
5V+)
Go to test no. 4
.
Voltage stays at 0V
Check speed control wire for
open circuit between blower
motor and FCU or ACU. If okay,
check FCU/ACU. Repair/replace
as necessary, then
go to test
no. 7
.
4
Check for mechanical
obstruction/locked
rotor.
Remove the blower motor from
the HVAC housing.
Check for obstruction preventing
blower from turning.
Check if rotor spins freely by
hand.
Obstruction
Remove obstruction as
necessary, then
go to test no.
7
.
Rotor locked
Replace blower motor, then
go
to test no. 7
.
Neither
Go to test no. 5
.
Heater and Air Conditioner Troubleshooting
83.00
Symptom Driven Diagnosis
122SD and Coronado Workshop Manual, Supplement 9, June 2014
350/25
