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Engine-Codes – Generic – C1779

C1779 Code - Blower Switch Failure

Quick Answer

The C1779 diagnostic trouble code (DTC) indicates a blower switch failure in the vehicle's HVAC (Heating, Ventilation, and Air Conditioning) system. Common causes include Electrical issues, such as a blown fuse or a faulty wiring connection, Wear and tear on the blower switch due to prolonged use, Contamination or debris affecting the internal components of the blower switch. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
C1779 indicates Blower Switch Failure.
Common causes
Common causes include Electrical issues, such as a blown fuse or a faulty wiring connection, Wear and tear on the blower switch due to prolonged use, Contamination or debris affecting the internal components of the blower switch.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code C1779 Description

The C1779 diagnostic trouble code (DTC) indicates a blower switch failure in the vehicle's HVAC (Heating, Ventilation, and Air Conditioning) system. The blower switch is responsible for controlling the speed of the blower motor, which regulates the airflow inside the vehicle's cabin. When the blower switch fails, it can lead to a lack of control over the HVAC system, resulting in discomfort for the occupants.

OBDII Code C1779 - Blower Switch Failure
C1779 Code - Blower Switch Failure

Common Causes of C1779

  1. Electrical issues, such as a blown fuse or a faulty wiring connection.
  2. Wear and tear on the blower switch due to prolonged use.
  3. Contamination or debris affecting the internal components of the blower switch.
  4. Overloading the blower motor by running it at maximum speed for extended periods.
  5. Manufacturing defects in the blower switch components.

Symptoms of C1779

  1. Inability to adjust the airflow speed of the HVAC system.
  2. No airflow coming out of the vents despite the HVAC system being turned on.
  3. The blower motor only working on certain speed settings.
  4. Unusual noises coming from the HVAC system when the blower is activated.
  5. Inconsistent airflow intensity when changing the blower speed settings.

How to Fix C1779

  1. Begin by disconnecting the vehicle's battery to prevent any electrical mishaps during the repair process.
  2. Locate the blower switch within the HVAC control panel and remove any trim pieces necessary to access it.
  3. Inspect the wiring connections and terminals of the blower switch for any signs of corrosion or damage.
  4. Test the blower switch using a multimeter to determine if it is functioning correctly.
  5. If the blower switch is confirmed to be faulty, replace it with a new unit and reassemble the HVAC control panel.

Cost to Fix C1779

The typical repair costs for addressing a blower switch failure can range from $100 to $300, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is advisable to check local rates for a more precise estimate, as rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. Additionally, the cost of the blower switch itself may vary depending on the vehicle's make and model.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1779 Code

1. What does OBDII code C1779 mean?

C1779 indicates a failure in the blower switch circuit, commonly associated with the HVAC system in a vehicle.

2. What are the common symptoms of code C1779?

Symptoms include the blower fan not working, inconsistent fan speeds, or the HVAC system failing to respond to adjustments.

3. What causes the C1779 code to appear?

The code is typically caused by a faulty blower switch, damaged wiring, a bad blower motor resistor, or a malfunctioning HVAC control module.

4. How can I diagnose the C1779 code?

Start by inspecting the blower switch, checking for loose or damaged wiring, and testing the blower motor resistor for continuity.

5. Can I still drive my car with a C1779 code?

Yes, but HVAC system issues may affect comfort, especially in extreme weather, which could indirectly impact driver focus.

6. How do I fix the C1779 code?

Repairs may involve replacing the blower switch, repairing damaged wiring, or replacing the blower motor resistor or control module.

7. How much does it cost to repair a C1779 code?

Costs vary depending on the issue, but replacing a blower switch typically costs $50–$200, plus labor.

8. Can I clear the C1779 code without fixing the problem?

You can clear the code with an OBDII scanner, but it will return unless the underlying issue is resolved.

9. What tools do I need to fix a C1779 code?

Common tools include a multimeter for circuit testing, an OBDII scanner, and basic hand tools for component replacement.

10. Could a blown fuse cause the C1779 code?

Yes, a blown fuse in the HVAC circuit can cause the blower switch to fail and trigger the code. Always check fuses during diagnosis.

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