how to check if the blower motor resistor is bad on my Honda Accord 8th Generation (2008-2012)?

Honda Accord 8th Generation (2008-2012)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

528 words

Problem Statement

Learn how to diagnose and fix blower motor resistor issues in Honda Accord 8th Generation (2008-2012). Step-by-step guide with symptoms and solutions.

Affected Component

HVAC

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shock or damage.

Symptoms

•Blower motor only works on certain speeds or not at all
•Inconsistent air flow from the vents
•Blower motor operates at full speed only
•No air coming from vents despite fan operation
•Odd noises from the blower motor area when operating

Diagnostic Steps

1
Check for any blown fuses related to the blower motor circuit using the vehicle's fuse box diagram.
2
Use an OBD-II scanner to check for any related error codes that may indicate issues with the HVAC system.
3
Inspect the blower motor operation by setting the climate control to various speeds and observing the response.
4
Measure the resistance of the blower motor resistor using a multimeter to verify if it falls within the specified range.
5
Inspect wiring and connectors for any signs of damage, corrosion, or loose connections.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•Multimeter
•Screwdrivers
•Pliers
•Safety glasses
•Flashlight

Parts Required

•Blower motor resistor (if faulty)

Related Faults

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Diagnostic Steps

1
Check for any blown fuses related to the blower motor circuit using the vehicle's fuse box diagram.
2
Use an OBD-II scanner to check for any related error codes that may indicate issues with the HVAC system.
3
Inspect the blower motor operation by setting the climate control to various speeds and observing the response.
4
Measure the resistance of the blower motor resistor using a multimeter to verify if it falls within the specified range.
5
Inspect wiring and connectors for any signs of damage, corrosion, or loose connections.

Solution

1. Preparation

Tools Required: Multimeter, screwdrivers, pliers, safety glasses, flashlight.
Disconnect the negative battery terminal to prevent any electrical shock or damage.

2. Access the Blower Motor Resistor

Locate the blower motor resistor, typically found under the dashboard on the passenger side or behind the glove compartment.
Remove any necessary panels or covers to gain access to the resistor.
Use a screwdriver to remove screws securing the resistor.

3. Remove the Blower Motor Resistor

Carefully disconnect the electrical connector from the resistor by pressing the release tab.
Remove the blower motor resistor from its mount.

4. Test the Blower Motor Resistor

Set the multimeter to the resistance (ohms) setting.
Measure the resistance across the terminals of the resistor. Compare the readings with the manufacturer's specifications.
If the resistance is outside the specified range, the resistor is faulty and needs replacement.

5. Install New Blower Motor Resistor

If necessary, replace with a new blower motor resistor that meets OEM specifications.
Reconnect the electrical connector to the new resistor.
Secure the resistor back into its mounting position with screws.

6. Reassemble and Test

Reinstall any panels or covers removed during access.
Reconnect the negative battery terminal.
Start the vehicle and test the blower motor operation at all speeds to confirm functionality.