Symptom:
*BLOWER MOTOR INOPERATIVE
POSSIBLE CAUSES
IPM FUSE #4
BLOWER MOTOR FEED CIRCUIT SHORTED TO GROUND
FUSED B(+) SHORTED TO GROUND
BLOWER MOTOR SHORTED TO GROUND
BLOWER MOTOR
BLOWER MOTOR HIGH DRIVER CIRCUIT OPEN
GROUND CIRCUIT OPEN
A/C - HEATER CONTROL MODULE OPEN
BLOWER MOTOR FEED CIRCUIT OPEN
FUSED B(+) CIRCUIT OPEN
IGNITION SWITCH OPEN
TEST ACTION APPLICABILITY
1 Turn the ignition off.
Remove and inspect IPM Fuse #4.
Is the fuse open?
All
Yes → Go To 2
No → Go To 5
2 Turn the ignition off.
Replace IPM Fuse #4.
Turn the ignition on.
Turn the blower on and operate it in all speeds and modes.
Does the blower motor operate properly without blowing the fuse?
All
Yes → Check the Blower Motor Feed circuit and the Fused B(+) circuit
for an intermittent short to ground. Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No → Go To 3
3 Turn the ignition off.
Disconnect the Blower Motor harness connector.
Measure the resistance between ground and the Blower Motor Feed circuit.
Is the resistance below 10K ohms?
All
Yes → Repair the Blower Motor Feed circuit for a short to ground and
replace the fuse.
Perform BODY VERIFICATION TEST - VER 1.
No → Go To 4
408
HEATING & A/C
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