Blower Motor Inoperative - Dodge Ram 2004 Service Manual

HEATING & A/C
Symptom:

*BLOWER MOTOR INOPERATIVE

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
1 Turn the ignition off.
Remove and inspect IPM Fuse #4.
Is the fuse open?
Yes → Go To 2
→ Go To 5
No
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?
Yes → Check the Blower Motor Feed circuit and the Fused B(+) circuit
→ Go To 3
No
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?
Yes → Repair the Blower Motor Feed circuit for a short to ground and
→ Go To 4
No
POSSIBLE CAUSES
ACTION
for an intermittent short to ground. Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
replace the fuse.
Perform BODY VERIFICATION TEST - VER 1.
408
APPLICABILITY
All
All
All