AutoCodes – Mercury – B2564 Mercury

B2564 Mercury Code - Auxiliary Blower Motor Speed Relay 2 Circuit Open/Short To Ground

Quick Answer

Under normal operation, ground for the blower motor is provided through the circuit from the blower motor resistor (LO and MED-LO) and the blower motor speed relay 1 (MED-HI and HI). Common causes include Faulty Auxiliary Blower Motor Speed Relay 2, Auxiliary Blower Motor Speed Relay 2 harness is open or shorted, Auxiliary Blower Motor Speed Relay 2 circuit poor electrical connection. 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: B2564 Mercury indicates Auxiliary Blower Motor Speed Relay 2 Circuit Open/Short To Ground.
Common causes: Common causes include Faulty Auxiliary Blower Motor Speed Relay 2, Auxiliary Blower Motor Speed Relay 2 harness is open or shorted, Auxiliary Blower Motor Speed Relay 2 circuit poor electrical connection.
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.

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Code Popularity 476

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 01, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2564 Mercury Description

Under normal operation, ground for the blower motor is provided through the circuit from the blower motor resistor (LO and MED-LO) and the blower motor speed relay 1 (MED-HI and HI). The blower resistor is grounded through the circuit. The blower motor speed relay coils are supplied through the circuit. Blower motor speed is received by the SJB from the rear auxiliary control through the circuit. Reference voltage for the blower speed selector resistor is provided by the SJB through the circuit. The auxiliary blower motor relay coil receives ground from the Smart Junction Box (SJB) through the circuit if any blower switch position but OFF is selected.
In LO, ground for the blower motor is provided through the blower motor resistor.
In MED-LO, blower motor speed relay 2 is grounded by the SJB through the circuit. Blower motor ground circuit is connected through one half of the blower motor resistor to the circuit. The circuit is connected through the blower motor speed relay 2 to the blower motor resistor ground circuit.
In MED-HI, blower motor speed relay 1 is grounded by the SJB through the circuit. Blower motor ground circuit is connected through blower motor speed relay 2 to the circuit. The circuit is connected through one half of the blower motor resistor to the blower motor resistor ground circuit.
In HI, blower motor speed relays 1 and 2 are grounded by the SJB through the circuit. Blower motor ground circuit 515 (OG/RD) is connected through the blower motor speed relay 1 to the circuit. The circuit is connected through the blower motor speed relay 2 to the blower motor resistor ground circuit.

OBDII Code B2564 Mercury - Auxiliary Blower Motor Speed Relay 2 Circuit Open/Short To Ground - AutoCodes.com — B2564 Mercury Code - Auxiliary Blower Motor Speed Relay 2 Circuit Open/Short To Ground

What does this mean?

What are the Possible Causes of the DTC B2564 Mercury?

Faulty Auxiliary Blower Motor Speed Relay 2
Auxiliary Blower Motor Speed Relay 2 harness is open or shorted
Auxiliary Blower Motor Speed Relay 2 circuit poor electrical connection
Faulty Blower Motor Resistor
Faulty Smart Junction Box (SJB)

How to Fix the DTC B2564 Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2564 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B2564 Mercury code?

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Need Help with the Code?

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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 B2564 Mercury Code

1. What are the common symptoms of OBDII code B2564 in a Mercury related to the Auxiliary Blower Motor Speed Relay 2 Circuit?

The common symptoms include issues with the blower motor not working at all or running at a single speed regardless of the settings.

2. What are the possible causes of OBDII code B2564 in a Mercury?

Possible causes include a faulty blower motor speed relay, a short to ground in the circuit, or a damaged wiring harness related to the auxiliary blower motor.

3. How can I diagnose the issue causing OBDII code B2564 in my Mercury?

You can diagnose the issue by checking the wiring harness for any visible damage, testing the blower motor speed relay for proper function, and using a multimeter to check for shorts to ground in the circuit.

4. Can I continue driving my Mercury with OBDII code B2564 present?

It is not recommended to continue driving the vehicle with this code present, as it can lead to issues with the heating, ventilation, and air conditioning system, affecting the comfort and safety of the occupants.

5. What are some repair tips for fixing OBDII code B2564 in a Mercury?

Repair tips include replacing the faulty blower motor speed relay, repairing any damaged wiring in the circuit, and ensuring all connections are secure and free of corrosion.

6. How much does it typically cost to repair OBDII code B2564 in a Mercury at a professional auto repair shop?

The cost of repairing this code can vary depending on the extent of the damage and the labor rates of the repair shop, but it generally ranges from $100 to $300 for parts and labor.

7. Can I attempt to repair OBDII code B2564 in my Mercury myself?

If you have experience with automotive electrical systems and the necessary tools, you may attempt to repair this code yourself. However, it is recommended to consult a professional if you are unsure or unfamiliar with the repair process.

8. Will resetting the OBDII code B2564 in my Mercury make the issue go away?

Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the code to trigger. It is important to diagnose and repair the root cause of the problem.

9. Is OBDII code B2564 specific to Mercury vehicles only?

While this particular code may be more common in Mercury vehicles, it can also occur in other makes and models equipped with similar auxiliary blower motor systems.

10. How can I prevent OBDII code B2564 from occurring in my Mercury in the future?

Regularly inspecting and maintaining the auxiliary blower motor system, checking for any signs of wear or damage, and addressing any issues promptly can help prevent this code from occurring in the future.