Chrysler Pacifica. Manual — part 159
TEST
ACTION
APPLICABILITY
3
Replace IPM Front Blower Fuse.
Turn the ignition on.
Press the A/C Heater Control’s power switch on.
Operate the blower in all speeds and modes.
Does the blower motor operate properly without blowing the fuse?
All
Yes
→ Refer to the wiring diagrams located in the service information to
help isolate a possible intermittent short to ground condition.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
4
Turn the ignition off.
Disconnect the 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 Front Blower Fuse.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 5
5
Turn the ignition off.
Disconnect the Blower Motor Resistor Block C1 harness connector.
Disconnect the Blower Motor Resistor Block C2 harness connector.
Measure the resistance between Blower Motor Resistor Block pin C2-1 and pins C2-2,
C1-2, C1-3, C1-5, and C1-6.
Is there continuity between pin C2-1 and any other pin?
All
Yes
→ Replace the Blower Motor Resistor Block in accordance with the
Service Information. Replace IPM Front Blower Fuse.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 6
6
Turn the ignition off.
Disconnect the Blower Motor Resistor Block C1 harness connector.
Disconnect the Blower Motor Resistor Block C2 harness connector.
Measure the resistance between Blower Motor Resistor Block pin C1-4 and pins C2-2,
C1-2, C1-3, C1-5, and C1-6.
Is there continuity between pin C1-4 and any other pin?
All
Yes
→ Replace the Blower Motor Resistor Block in accordance with the
Service Information. Replace IPM Front Blower Fuse.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Blower Motor in accordance with the Service Infor-
mation. Replace IPM Front Blower Fuse.
Perform BODY VERIFICATION TEST - VER 1.
633
HEATING & A/C
*BLOWER MOTOR INOPERATIVE - MTC —
Continued
TEST
ACTION
APPLICABILITY
7
Ensure IPM Front Blower Fuse is installed.
Turn the ignition on.
Press the A/C Heater Control’s power switch 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 Supply circuit
in the 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 ignition off.
Using a jumper wire connected to ground, back probe the Blower Driver circuit in the
Blower Motor Resistor Block C2 harness connector.
Turn the ignition on.
Press the A/C Heater Control’s power switch 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 ignition off.
Disconnect the A/C Heater Control C2 harness connector.
Using a jumper wire connected to ground, back probe the Blower Motor High Driver
circuit in the A/C Heater Control C2 harness connector.
Turn the ignition on.
Press the A/C Heater Control’s power switch 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 C2 harness connector.
Measure the resistance of the Ground circuit between the A/C Heater Control C2
harness connector and ground.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the A/C Heater Control 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.
634
HEATING & A/C
*BLOWER MOTOR INOPERATIVE - MTC —
Continued
TEST
ACTION
APPLICABILITY
11
Turn the ignition off.
Disconnect the A/C Heater Control C2 harness connector.
Disconnect the Blower Motor Resistor Block C1 harness connector.
Measure the resistance of the Blower Motor High Driver circuit between the A/C
Heater Control C2 harness connector and the Blower Motor Resistor Block C1
harness connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the 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.
Press the A/C Heater Control’s power switch 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 Blower Motor Resistor Block C1 harness connector.
Does the test light illuminate brightly?
All
Yes
→ Replace the 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 Integrated Power Module (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 Front Blower Fuse.
Measure the resistance between cavity 87 of the Front Blower Motor Relay connector
and IPM Front Blower Fuse (power input cavity).
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 15
No
→ Replace the Integrated Power Module (IPM) in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
635
HEATING & A/C
*BLOWER MOTOR INOPERATIVE - MTC —
Continued
TEST
ACTION
APPLICABILITY
15
Turn the ignition off.
Make sure that the Front Blower Motor Relay is installed.
Remove IPM Front Blower Fuse.
Turn the ignition on.
Press the A/C Heater Control’s power switch 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, probe IPM Front Blower Fuse (power
input cavity).
Does the test light illuminate brightly?
All
Yes
→ Go To 16
No
→ Replace the Front Blower Motor Relay in accordance with the
Service Information.
Perform BODY VERIFICATION TEST - VER 1.
16
Turn the ignition off.
Remove IPM Front Blower Fuse.
Disconnect the IPM C9 harness connector.
Measure the resistance between IPM Front Blower Fuse (power output cavity) and
cavity 8 of the IPM C9 connector (IPM side).
Is the resistance below 5.0 ohms?
All
Yes
→ Repair the Fused Front Blower Motor Relay Output circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Replace the Integrated Power Module (IPM) in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
636
HEATING & A/C
*BLOWER MOTOR INOPERATIVE - MTC —
Continued
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