Dodge Ram. Manual — part 103
TEST
ACTION
APPLICABILITY
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?
All
Yes
→ Repair the Fused B(+) circuit for a short to ground and replace the
fuse.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Blower Motor and fuse in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
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?
All
Yes
→ Go To 6
No
→ Go To 9
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?
All
Yes
→ Go To 7
No
→ Replace the Blower Motor in accordance with the Service Infor-
mation.
Perform BODY VERIFICATION TEST - VER 1.
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?
All
Yes
→ Go To 8
No
→ Repair the Blower Motor High Driver circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
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?
All
Yes
→ Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
409
HEATING & A/C
*BLOWER MOTOR INOPERATIVE —
Continued
TEST
ACTION
APPLICABILITY
9
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 Ignition Switch harness connector.
Does the test light illuminate brightly?
All
Yes
→ Repair the Blower Motor Feed circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 10
10
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 Fused B(+) circuit in
the Ignition Switch harness connector.
Does the test light illuminate brightly?
All
Yes
→ Replace the Ignition Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Fused B(+) circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
410
HEATING & A/C
*BLOWER MOTOR INOPERATIVE —
Continued
Symptom:
*BLOWER MOTOR SPEEDS INCORRECT
POSSIBLE CAUSES
BLOWER MOTOR DRIVER CIRCUIT(S) SHORTED TO GROUND
A/C - HEATER CONTROL MODULE
BLOWER MOTOR DRIVER CIRCUIT(S) SHORTED TO VOLTAGE
BLOWER MOTOR DRIVER CIRCUITS SHORTED TOGETHER
A/C - HEATER CONTROL MODULE - SPEEDS INCORRECT
BLOWER MOTOR DRIVER CIRCUIT(S) OPEN
BLOWER MOTOR RESISTOR BLOCK - OPEN SPEED
TEST
ACTION
APPLICABILITY
1
Turn the Blower control to the Off position.
Turn the ignition on.
Does the blower run?
All
Yes
→ Go To 2
No
→ Go To 3
2
Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Disconnect the Blower Motor Resistor Block harness connector.
Measure the resistance between ground and each of the Blower Motor Driver circuits.
Is the resistance below 10K ohms on any of the circuits?
All
Yes
→ Repair all Blower Motor Driver circuits with a resistance below
10K ohms for a short to ground.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
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 each of the Blower Motor
Driver circuits (cavities 2, 3, 7, and 10) in the A/C - Heater Control Module C2
harness connector.
Does the test light illuminate brightly on each circuit?
All
Yes
→ Go To 4
No
→ Go To 6
411
HEATING & A/C
TEST
ACTION
APPLICABILITY
4
Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Disconnect the Blower Motor Resistor Block harness connector.
Measure the voltage of each of the Blower Motor Driver circuits (cavities 2, 3, 7, and
10).
Is there any voltage present?
All
Yes
→ Repair all Blower Motor Driver circuits with voltage present for a
short to voltage.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Disconnect the Blower Motor Resistor Block harness connector.
Measure the resistance between the Low Blower Motor Driver circuit and the M1,
M2, and Blower Motor High Driver circuit.
Measure the resistance between the M1 Blower Motor Driver circuit and the M2 and
Blower Motor High Driver circuit.
Measure the resistance between the M2 Blower Motor Driver circuit and the Blower
Motor High Driver circuit.
Is the resistance below 10K ohms between any of the circuits?
All
Yes
→ Repair the Blower Motor Driver circuits with a resistance below
10K ohms for a short to each other.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the A/C - Heater Control Module in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
6
Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Disconnect the Blower Motor Resistor Block harness connector.
Measure the resistance of each Blower Motor Driver circuit between the Blower
Motor Resistor Block harness connector and the A/C - Heater Control Module C2
harness connector.
Is the resistance below 5.0 ohms on each of the circuits?
All
Yes
→ Replace the Blower Motor Resistor Block in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair all Blower Motor Driver circuits with a resistance above 5
ohms for an open.
Perform BODY VERIFICATION TEST - VER 1.
412
HEATING & A/C
*BLOWER MOTOR SPEEDS INCORRECT —
Continued
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