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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: REAR FAN POT SHORTED (ACTIVE) >> Diagnostic Procedure

Diagnostic Procedure

REAR FAN POT SHORTED (ACTIVE) - DIAGNOSTIC PROCEDURE

TEST ACTION APPLICABILITY
1 Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Measure the resistance between ground and the Rear Fan Sense Supply circuit.
Is the resistance above 100K ohms?
  1. Yes: Go To 2
  2. No: Repair the Rear Fan Sense Supply circuit for a short to ground.

    Perform BODY VERIFICATION TEST VER-1 .

 All
2 Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the ATC C2 harness connector.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Measure the resistance between the Rear Fan Sense Supply circuit and the Rear Fan Sense Return circuit.
Is the resistance above 100K ohms?
  1. Yes: Go To 3
  2. No: Repair the Rear Fan Sense Supply circuit for a short to the Rear Fan Sense Return circuit.

    Perform BODY VERIFICATION TEST VER-1 .

 All
3 Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Measure the resistance of the Rear Fan Sense Supply circuit between the ATC C1 harness connector and the Rear Booster Fan Rear Control Switch harness connector.
Is the resistance below 5.0 ohms?
  1. Yes: Go To 4
  2. No: Repair the Rear Fan Sense Supply circuit for an open.

    Perform BODY VERIFICATION TEST VER-1 .

 All
4 Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Measure the resistance between ground and the Rear Fan Sense circuit.
Is the resistance above 100K ohms?
  1. Yes: Go To 5
  2. No: Repair the Rear Fan Sense circuit for a short to ground.

    Perform BODY VERIFICATION TEST VER-1 .

 All
5 Turn the ignition off.
Disconnect the ATC C1 harness connector.
Disconnect the ATC C2 harness connector.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Measure the resistance between the Rear Fan Sense circuit and the Rear Fan Sense Return circuit.
Is the resistance above 100K ohms?
  1. Yes: Go To 6
  2. No: Repair the Rear Fan Sense circuit for a short to the Rear Fan Sense Return circuit.

    Perform BODY VERIFICATION TEST VER-1 .

 All
6 Turn the ignition off.
Reconnect the ATC C1 & C2 harness connectors.
Disconnect the Rear Booster Fan Rear Control Switch harness connector.
Turn the ignition on.
With the DRBIII®, read active ATC DTCs.
Does the DRBIII® display: Rear Fan Pot Shorted?
  1. Yes: Replace the Automatic Temperature Control (ATC) in accordance with the Service Information.

    Perform BODY VERIFICATION TEST VER-1 .

  2. No: Replace the Rear Booster Fan Rear Control Switch in accordance with the Service Information.

    Perform BODY VERIFICATION TEST VER-1 .

 All
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