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Home >> Dodge and Ram >> 2003 >> Durango Base, 5.9 Z, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 105 (Body Diagnostic Procedures) >> Diagnostic Information And Procedure >> Heating & A/C >> Symptom: *Blower Motor Inoperative >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2004 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
BLOWER MOTOR INOPERATIVE - DIAGNOSTIC PROCEDURE

TEST ACTION
1 Turn the ignition off.
Remove and inspect Power Distribution Center Fuse #13.
Is the fuse open?
  1. Yes --> Go To 2
  2. No --> Go To 5
2 Turn the ignition off.
Replace the Power Distribution Center Fuse #13.
Turn the ignition on.
Turn the blower on and operate it in all speeds and modes.
Does the blower motor operate properly without blowing the fuse?
  1. Yes --> Check the Blower Motor Feed circuit and the Fused B(+) circuit for an intermittent short to ground. Repair as necessary.

    Perform BODY VERIFICATION TEST - VER 1  .

  2. No --> Go To 3
3 Turn the ignition off.
Disconnect the Blower Motor harness connector.
Measure the resistance between ground and the Blower Motor Feed circuit.
Is the resistance below 10K ohms?
  1. Yes --> Repair the Blower Motor Feed circuit for a short to ground and replace the fuse.

    Perform BODY VERIFICATION TEST - VER 1  .

  2. No --> Go To 4
4 Turn the ignition off.
Disconnect the Ignition Switch harness connector.
Measure the resistance between ground and the Fused B(+) circuit.
Is the resistance below 10K ohms?
  1. Yes --> Repair the Fused B(+) circuit for a short to ground and replace the fuse.

    Perform BODY VERIFICATION TEST - VER 1  .

  2. No --> Replace the Blower Motor and fuse in accordance with the Service Information.

    Perform BODY VERIFICATION TEST - VER 1  .
5 Ensure Power Distribution Center Fuse #13 is installed.
Disconnect the Blower Motor Resistor Block 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 Blower Motor Common Driver circuit in the Blower Motor Resistor Block harness connector.
Does the test light illuminate brightly?
  1. Yes --> Go To 6
  2. No --> Go To 9
6 Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Connect a jumper wire between ground and the High Blower Motor Driver circuit in the A/C - Heater Control Module C2 harness connector.
Turn the ignition on.
Does the blower motor run at high speed?
  1. Yes --> Go To 7
  2. No --> Go To 8
7 Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Measure the resistance between ground and the Ground circuit.
Is the resistance below 5.0 ohms?
  1. Yes --> Replace the A/C - Heater Control Module in accordance with the Service Information.

    Perform BODY VERIFICATION TEST - VER 1  .

  2. No --> Repair the Ground circuit for an open.

    Perform BODY VERIFICATION TEST - VER 1  .
8 Turn the ignition off.
Disconnect the A/C - Heater Control Module C2 harness connector.
Disconnect the Blower Motor Resistor Block harness connector.
Measure the resistance of the High Blower Motor Driver circuit between the A/C - Heater Control Module C2 harness connector and the Blower Motor Resistor Block harness connector.
Is the resistance below 5.0 ohms?
  1. Yes --> Replace the Blower Motor Resistor Block in accordance with the Service Information.

    Perform BODY VERIFICATION TEST - VER 1  .

  2. No --> Repair the High Blower Motor Driver circuit for an open.

    Perform BODY VERIFICATION TEST - VER 1  .
9 Turn the ignition off.
Disconnect the Blower Motor harness connector.
Disconnect the Blower Motor Resistor Block harness connector.
Measure the resistance of the Blower Motor Common Driver circuit between the Blower Motor harness connector and the Resistor Block harness connector.
Is the resistance below 5 ohms?
  1. Yes --> Go To 10
  2. No --> Repair the Blower Motor Common Driver circuit for an open.

    Perform BODY VERIFICATION TEST - VER 1  .
10 Turn the ignition off.
Disconnect the Blower Motor 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 Blower Motor Feed circuit in the Blower Motor harness connector.
Does the test light illuminate brightly?
  1. Yes --> Replace the Blower Motor in accordance with the Service Information.

    Perform BODY VERIFICATION TEST - VER 1  .

  2. No --> Go To 11
11 Turn the ignition off.
Disconnect the Ignition Switch 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 B(+) circuit in the Ignition Switch harness connector.
Does the test light illuminate brightly?
  1. Yes --> Replace the Ignition Switch in accordance with the Service Information.

    Perform BODY VERIFICATION TEST - VER 1  .

  2. No --> Repair the Fused B(+) circuit for an open.

    Perform BODY VERIFICATION TEST - VER 1  .
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