Chrysler Town, Dodge Caravan. Manual — part 833
Symptom:
*FRONT BLOWER MOTOR INOPERATIVE - MTC
POSSIBLE CAUSES
FRONT CONTROL MODULE (FCM) DTC(S) PRESENT
IPM FUSE #10
FUSED FRONT BLOWER MOTOR RELAY OUTPUT CIRCUIT SHORTED TO GROUND
FRONT BLOWER MOTOR RESISTOR BLOCK SHORTED TO GROUND
FRONT BLOWER MOTOR RESISTOR BLOCK SHORTED TO GROUND
BLOWER MOTOR
BLOWER MOTOR
A/C - HEATER CONTROL MODULE
GROUND CIRCUIT OPEN
BLOWER MOTOR HIGH DRIVER CIRCUIT OPEN
FRONT BLOWER MOTOR RESISTOR BLOCK OPEN
FRONT BLOWER MOTOR RESISTOR BLOCK OPEN
IPM - OPEN CIRCUIT
IPM - OPEN CIRCUIT
FRONT BLOWER MOTOR RELAY
IPM - OPEN CIRCUIT
FUSED FRONT BLOWER MOTOR RELAY OUTPUT CIRCUIT OPEN
TEST
ACTION
APPLICABILITY
1
With the DRBIII
t in Front Control Module, read the active DTCs.
Are any active FCM DTCs present?
All
Yes
→ For FCM DTCs related to the blower relay circuits, refer to the
Heating & A/C catagory. For all other FCM DTCs, refer to the
symptom list in the related catagory.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 2
2
Turn the ignition off.
Remove and inspect Intelligent Power Module (IPM) Fuse #10.
Is the fuse open?
All
Yes
→ Go To 3
No
→ Go To 7
568
HEATING & A/C
TEST
ACTION
APPLICABILITY
3
Replace IPM Fuse #10.
Turn the ignition on.
Turn the Power switch on the A/C - Heater Control Module on.
Operate the front blower in all speeds and modes.
Does the blower motor operate properly without blowing the fuse?
All
Yes
→ Check the Fused Front Blower Motor Relay Output circuit and
the High Speed Blower Motor circuit for an intermittent short to
ground. Repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the Front Blower Motor Resistor Block C1 harness connector.
Measure the resistance between ground and the Fused Front Blower Motor Relay
Output circuit.
Is the resistance below 10K ohms?
All
Yes
→ Repair the Fused Front Blower Motor Relay Output circuit for a
short to ground. Replace IPM Fuse #10.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the Front Blower Motor Resistor Block C1 harness connector.
Disconnect the Front Blower Motor Resistor Block C2 harness connector.
Measure the resistance between Front Blower Motor Resistor Block pin C2-2 and
pins C2-1, C1-1, C1-2, C1-3, C1-5, and C1-6.
Is there continuity between pin C2-2 and any other pin?
All
Yes
→ Replace the Front Blower Motor Resistor Block in accordance
with the Service Information. Replace IPM Fuse #10.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 6
6
Turn the ignition off.
Disconnect the Front Blower Motor Resistor Block C1 harness connector.
Disconnect the Front Blower Motor Resistor Block C2 harness connector.
Measure the resistance between Front Blower Motor Resistor Block pin C1-4 and
pins C2-1, C1-1, C1-2, C1-3, C1-5, and C1-6.
Is there continuity between pin C1-4 and any other pin?
All
Yes
→ Replace the Front Blower Motor Resistor Block in accordance
with the Service Information. Replace IPM Fuse #10.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Blower Motor in accordance with the Service Infor-
mation. Replace IPM Fuse #10.
Perform BODY VERIFICATION TEST - VER 1.
569
HEATING & A/C
*FRONT BLOWER MOTOR INOPERATIVE - MTC —
Continued
TEST
ACTION
APPLICABILITY
7
Ensure IPM Fuse #10 is installed.
Turn the ignition on.
Turn the Power switch on the A/C - Heater Control Module 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 High Speed Blower
Motor circuit in the Front Blower Motor Resistor Block C2 harness connector.
Does the test light illuminate brightly?
All
Yes
→ Go To 8
No
→ Go To 12
8
Turn the Power switch on the A/C - Heater Control Module off.
Turn the ignition off.
Using a jumper wire connected to ground, back probe the Rear Blower High Speed
circuit in the Front Blower Motor Resistor Block C2 harness connector.
Turn the ignition on.
Turn the Power switch on the A/C - Heater Control Module on.
Does the blower motor run at high speed?
All
Yes
→ Go To 9
No
→ Replace the Blower Motor in accordance with the Service Infor-
mation.
Perform BODY VERIFICATION TEST - VER 1.
9
Turn the Power switch on the A/C - Heater Control Module off.
Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Using a jumper wire connected to ground, back probe the Blower Motor High Driver
circuit in the A/C - Heater Control Module C2 harness connector.
Turn the ignition on.
Turn the Power switch on the A/C - Heater Control Module on.
Does the blower motor run at high speed?
All
Yes
→ Go To 10
No
→ Go To 11
10
Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Measure the resistance of the Ground circuit between the A/C - Heater Control
Module C2 harness connector and ground.
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.
570
HEATING & A/C
*FRONT BLOWER MOTOR INOPERATIVE - MTC —
Continued
TEST
ACTION
APPLICABILITY
11
Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Disconnect the Front Blower Motor Resistor Block C1 harness connector.
Measure the resistance of the Blower Motor High Driver circuit between the A/C -
Heater Control Module C2 harness connector and the Front Blower Motor Resistor
Block C1 harness connector.
Is the resistance below 5 ohms?
All
Yes
→ Replace the Front Blower Motor Resistor Block in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Repair the Blower Motor High Driver circuit for an open.
Perform BODY VERIFICATION TEST - VER 1.
12
Turn the ignition on.
Turn the Power switch on the A/C - Heater Control Module 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 Fused Front Blower
Motor Relay Output circuit in the Front Blower Motor Resistor Block C1 harness
connector.
Does the test light illuminate brightly?
All
Yes
→ Replace the Front Blower Motor Resistor Block in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 13
13
Turn the ignition off.
Remove the Front Blower Motor Relay from the IPM.
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, probe cavity 30 of the Front Blower
Motor Relay connector.
Does the test light illuminate brightly?
All
Yes
→ Go To 14
No
→ Replace the IPM in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
14
Turn the ignition off.
Remove the Front Blower Motor Relay from the IPM.
Remove IPM Fuse #10.
Measure the resistance between cavity 87 of the Front Blower Motor Relay connector
and IPM Fuse #10 (power input cavity).
Is the resistance below 5 ohms?
All
Yes
→ Go To 15
No
→ Replace the IPM in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
571
HEATING & A/C
*FRONT BLOWER MOTOR INOPERATIVE - MTC —
Continued
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