Dodge Ram 2004 Service Manual page 423

*BLOWER MOTOR INOPERATIVE —
TEST
4 Turn the ignition off.
Disconnect the Ignition Switch harness connector.
Measure the resistance between ground and the Fused B(+) circuit.
Is the resistance below 10K ohms?
Yes → Repair the Fused B(+) circuit for a short to ground and replace the
→ Replace the Blower Motor and fuse in accordance with the Service
No
5 Turn the ignition on.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Using a 12-volt test light connected to ground, back probe the Blower Motor Feed
circuit in the Blower Motor harness connector.
Does the test light illuminate brightly?
Yes → Go To 6
→ Go To 9
No
6 Turn the ignition off.
Connect a jumper wire between ground and the Blower Motor High Driver circuit in
the Blower Motor harness connector.
Turn the ignition on.
Does the blower motor run at high speed?
Yes → Go To 7
→ Replace the Blower Motor in accordance with the Service Infor-
No
7 Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Disconnect the Blower Motor harness connector.
Measure the resistance of the Blower Motor High Driver circuit between the A/C -
Heater Control Module C2 harness connector and the Blower Motor harness
connector.
Is the resistance below 5.0 ohms?
Yes → Go To 8
→ Repair the Blower Motor High Driver circuit for an open.
No
8 Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Measure the resistance between ground and the Ground circuit.
Is the resistance below 5.0 ohms?
Yes → Replace the A/C - Heater Control Module in accordance with the
→ Repair the Ground circuit for an open.
No
ACTION
fuse.
Perform BODY VERIFICATION TEST - VER 1.
Information.
Perform BODY VERIFICATION TEST - VER 1.
mation.
Perform BODY VERIFICATION TEST - VER 1.
Perform BODY VERIFICATION TEST - VER 1.
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Perform BODY VERIFICATION TEST - VER 1.
Continued
409
HEATING & A/C
APPLICABILITY
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