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Home >> Chrysler >> 2005 >> Pacifica Limited >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Body Diagnostic Procedures - Diagnostic Information And Procedures - HVAC, Ignition Power Accessory, Instrument Cluster, Interior Lighting, Navigation, Overhead Console >> Heating & A/C >> Symptom: *BLOWER MOTOR INOPERATIVE - MTC >> Diagnostic Procedure

Diagnostic Procedure

BLOWER MOTOR INOPERATIVE - MTC SYMPTOM CHART

TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIII®, read Integrated Power Module (IPM) DTCs.
Did the DRBIII® display any DTCs?
Yes --> For Integrated Power Module (IPM) DTCs related to the front blower relay circuits, refer to the HEATING & A/C category. For all other IPM DTCs, refer to the appropriate test in the related category.
Perform BODY VERIFICATION TEST - VER 1 .
No --> Go To 2		 All
2 Turn the ignition off.
Remove and inspect IPM Front Blower Fuse.
Is the fuse open?
Yes --> Go To 3
No --> Go To 7		 All
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?
Yes --> Refer to SYSTEM WIRING DIAGRAMS to help isolate a possible intermittent short to ground condition.
Perform BODY VERIFICATION TEST - VER 1 .
No --> Go To 4		 All
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?
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		 All
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?
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		 All
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?
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 Information.
Replace IPM Front Blower Fuse.
Perform BODY VERIFICATION TEST - VER 1 .		 All
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?
Yes --> Go To 8
No --> Go To 12		 All
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?
Yes --> Go To 9
No --> Replace the Blower Motor in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1 .		 All
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?
Yes --> Go To 10
No --> Go To 11		 All
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?
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 .		 All
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?
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 .		 All
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?
Yes --> Replace the Blower Motor Resistor Block in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1 .
No --> Go To 13		 All
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?
Yes --> Go To 14
No --> Replace the Integrated Power Module (IPM) in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1 .		 All
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?
Yes --> Go To 15
No --> Replace the Integrated Power Module (IPM) in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1 .		 All
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?
Yes --> Go To 16
No --> Replace the Front Blower Motor Relay in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1 .		 All
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?
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 .		 All
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