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Home >> Chrysler >> 2004 >> Pacifica AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Body Diagnostic Procedures - HVAC, Ignition Power Accessory, Instrument Cluster, Interior Lighting, Navigation, Overhead Console, Power Door Locks/RKE >> Heating & A/C >> Symptom: *FRONT BLOWER MOTOR INOPERATIVE >> Diagnostic Procedure

Diagnostic Procedure

*FRONT BLOWER MOTOR INOPERATIVE - DIAGNOSTIC PROCEDURE

TEST ACTION APPLICABILITY
1
NOTE: Verify that the vehicle's odometer displays more than 3 miles. If not, drive the vehicle until the odometer displays more than 3 miles and then recheck blower motor operation. If still inoperative, proceed as follows:
Turn the ignition on. With the DRBIII®, read IPM DTCs.Does the DRBIII® display any DTCs?
  1. Yes: For Integrated Power Module (IPM) DTCs related to the front blower or rear fan relay circuits, refer to the Heating & A/C category. For all other IPM DTCs, refer to appropriate category for the related symptom(s).

    Perform BODY VERIFICATION TEST VER-1 .

  2. No: Go To 2
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2 Turn the ignition off.
Remove and inspect IPM Fuse #42 (Front Blower Fuse).
Is the fuse open?
  1. Yes: Go To 3
  2. No: Go To 6
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3 Replace IPM Fuse #42 (Front Blower Fuse).
Turn the ignition on.
Operate the Front Blower Motor in all speeds.
Start the engine and operate the ATC system in all modes and speeds.
Does the Front Blower Motor operate properly without blowing the fuse?
  1. Yes: Refer to the SYSTEM WIRING DIAGRAMS located in the service information to help isolate a possible intermittent short to ground condition.

    Perform BODY VERIFICATION TEST VER-1 .

  2. No: Go To 4
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4 Turn the ignition off.
Disconnect the Front Blower Power Module C1 harness connector.
Measure the resistance between ground and the Fused Front Blower Relay Output circuit.
Is the resistance below 10K ohms?
  1. Yes: Repair the Fused Front Blower Relay Output circuit for a short to ground. Replace IPM Fuse #42 (Front Blower Fuse).

    Perform BODY VERIFICATION TEST VER-1 .

  2. No: Go To 5
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5 Turn the ignition off.
Replace IPM Fuse #42 (Front Blower Fuse).
Disconnect the Front Blower Power Module C1 harness connector.
Disconnect the Front Blower Power Module C2 harness connector.
Connect a jumper wire between the Fused Front Blower Relay Output circuit in the Front Blower Power Module C1 harness connector and the Blower Motor Supply circuit in the Front Blower Power Module C2 harness connector.
Connect a jumper wire between the Ground circuit in the Front Blower Power Module C1 harness connector and the Blower Motor Ground circuit in the Front Blower Power Module C2 harness connector.
Turn the ignition on.
Does the Front Blower Motor operate at full speed without blowing the fuse?
  1. Yes: Replace the Front Blower Power Module in accordance with the Service Information. Replace IPM Fuse #42 (Front Blower Fuse).

    Perform BODY VERIFICATION TEST VER-1 .

  2. No: Replace the Front Blower Motor in accordance with the Service Information. Replace IPM Fuse #42 (Front Blower Fuse).

    Perform BODY VERIFICATION TEST VER-1 .

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6 Ensure IPM Fuse #42 (Front Blower Fuse) is installed.
Disconnect the Front Blower Power Module C1 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 the Fused Front Blower Relay Output circuit in the Front Blower Power Module C1 harness connector.
Does the test light illuminate brightly?
  1. Yes: Go To 7
  2. No: Go To 13
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7 Turn the ignition off.
Disconnect the Front Blower Power Module C1 harness connector.
Measure the resistance between ground and the Ground circuit.
Is the resistance below 5.0 ohms?
  1. Yes: Go To 8
  2. No: Repair the Ground circuit for an open.

    Perform BODY VERIFICATION TEST VER-1 .

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8 Turn the ignition off.
Disconnect the Front Blower Power Module C1 harness connector.
Disconnect the ATC C1 harness connector.
Turn the ignition on.
Measure the voltage of the Front Blower Motor Control circuit.
Is the voltage above 0.2 volts?
  1. Yes: Repair the Front Blower Motor Control circuit for a short to voltage.

    Perform BODY VERIFICATION TEST VER-1 .

  2. No: Go To 9
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9 Turn the ignition off.
Disconnect the Front Blower Power Module C1 harness connector.
Disconnect the ATC C1 harness connector.
Measure the resistance of the Front Blower Motor Control circuit between the Front Blower Power Module C1 harness connector and the ATC C1 harness connector.
Is the resistance below 5.0 ohms?
  1. Yes: Go To 10
  2. No: Repair the Front Blower Motor Control circuit for an open.

    Perform BODY VERIFICATION TEST VER-1 .

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10 Turn the ignition off.
Reconnect the Front Blower Power Module C1 harness connector.
Reconnect the ATC C1 harness connector.
Start the engine.
Press the ATC's PWR switch on.
Set the front blower speed to low.
While back probing, measure the voltage of the Front Blower Motor Control circuit in the ATC C1 harness connector.
Is the voltage above 7.5 volts?
  1. Yes: Go To 11
  2. No: Replace the Front Blower Power Module in accordance with the Service Information.

    Perform BODY VERIFICATION TEST VER-1 .

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11 Turn the ignition off.
Reconnect all previously disconnected components.
Connect the DRBIII® X10 Scope Probe CH7061 to the DRBIII®.
Select the following from the DRBIII® menu: PEP Module Tools; Lab Scope; Live Data; and Lab Scope.
Set the time to 10ms/Div.
Set the voltage range to +20.0v.
Set the offset to 4.00v.
Set the Probe to X10.
Start the engine.
Press the ATC's PWR switch on.
Using the X10 Scope Probe, back probe the Front Blower Motor Control circuit in the Front Blower Power Module C1 harness connector.
NOTE: The Blower Power Module provides a 12.0 volt signal to the ATC over the Front Blower Motor Control circuit. The ATC provides a variable duty cycle ground to the 12.0 volt signal based on input from the Front Blower Speed Control switch.
NOTE: When the blower speed is set to low, the ATC provides a short duty cycle (less time grounding the signal voltage).
NOTE: As higher blower speeds are requested, the ATC increases the duty cycle (more time grounding the signal voltage).
NOTE: When the highest blower speed is requested, the duty cycle increases to where the signal pattern is almost a flat line (with brief voltage spikes).

Set the blower speed to low, then slowly increase the blower speed to high while observing the DRBIII® display.
The voltage on the scope pattern should cycle from approximately 0 volts (duty cycle on) to 12.0 volts (duty cycle off) for all blower speeds.
The duty cycle pattern should change smoothly as the blower speed changes from low to high.
Does the DRBIII® display the voltage range and duty cycle as described above?
  1. Yes: Go To 12
  2. No: Replace the Automatic Temperature Control (ATC) in accordance with the Service Information.

    Perform BODY VERIFICATION TEST VER-1 .

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12 Turn the ignition off.
Disconnect the Front Blower Power Module C1 harness connector.
Disconnect the Front Blower Power Module C2 harness connector.
Connect a jumper wire between the Fused Front Blower Relay Output circuit in the Front Blower Power Module C1 harness connector and the Blower Motor Supply circuit in the Front Blower Power Module C2 harness connector.
Connect a jumper wire between the Ground circuit in the Front Blower Power Module C1 harness connector and the Blower Motor Ground circuit in the Front Blower Power Module C2 harness connector.
Turn the ignition on.
Does the Front Blower Motor operate at full speed?
  1. Yes: Replace the Front Blower Power Module in accordance with the Service Information.

    Perform BODY VERIFICATION TEST VER-1 .

  2. No: Replace the Front Blower Motor in accordance with the Service Information.

    Perform BODY VERIFICATION TEST VER-1 .

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13 Turn the ignition off.
Remove the Front Blower 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 Relay connector.
Does the test light illuminate brightly?
  1. Yes: Go To 14
  2. No: Replace the Integrated Power Module (IPM) in accordance with the Service Information.

    Perform BODY VERIFICATION TEST VER-1 .

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14 Turn the ignition off.
Remove the Front Blower Relay from the IPM.
Remove IPM Fuse #42 (Front Blower Fuse).
Measure the resistance between cavity 87 of the Front Blower Relay connector and IPM Fuse #42 (power input cavity).
Is the resistance below 5.0 ohms?
  1. Yes: Go To 15
  2. No: Replace the Integrated Power Module (IPM) in accordance with the Service Information.

    Perform BODY VERIFICATION TEST VER-1 .

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15 Turn the ignition off.
Make sure that the Front Blower Relay is installed.
Remove IPM Fuse #42 (Front Blower Fuse).
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, probe IPM Fuse #42 (power input cavity).
Does the test light illuminate brightly?
  1. Yes: Go To 16
  2. No: Replace the Front Blower Relay in accordance with the Service Information.

    Perform BODY VERIFICATION TEST VER-1 .

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16 Turn the ignition off.
Remove IPM Fuse #42 (Front Blower Fuse).
Disconnect the IPM C9 harness connector.
Measure the resistance between IPM Fuse #42 (power output cavity) and cavity 8 of the IPM C9 connector (IPM side).
Is the resistance below 5.0 ohms?
  1. Yes: Repair the Fused Front Blower Relay Output circuit for an open.

    Perform BODY VERIFICATION TEST VER-1 .

  2. No: Replace the Integrated Power Module (IPM) in accordance with the Service Information.

    Perform BODY VERIFICATION TEST VER-1 .

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