AutoCodes – Mercury – B1C84 Mercury

B1C84 Mercury Code - Heated Rear Window Relay Output

Quick Answer

The Body Control Module (BCM) monitors the Heated Rear Window Relay Output. Common causes include Faulty Heated Rear Window Relay, Heated Rear Window Relay harness is open or shorted, Heated Rear Window Relay 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: B1C84 Mercury indicates Heated Rear Window Relay Output.
Common causes: Common causes include Faulty Heated Rear Window Relay, Heated Rear Window Relay harness is open or shorted, Heated Rear Window Relay 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 878

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 Aug 26, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1C84 Mercury Description

The Body Control Module (BCM) monitors the Heated Rear Window Relay Output. The BCM sets the OBDII code when the Heated Rear Window Relay Output is not to factory specifications.

OBDII Code B1C84 Mercury - Heated Rear Window Relay Output - AutoCodes.com — B1C84 Mercury Code - Heated Rear Window Relay Output

What does this mean?

What are the Possible Causes of the DTC B1C84 Mercury?

Faulty Heated Rear Window Relay
Heated Rear Window Relay harness is open or shorted
Heated Rear Window Relay circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1C84 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 does this mean?

Code Tech Notes

B1C84:11 Heated Rear Window Relay Output Circuit Short to Ground
B1C84:12 Heated Rear Window Relay Output Circuit Short To Battery
B1C84:13 Heated Rear Window Relay Output Circuit Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1C84 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 B1C84 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 B1C84 Mercury Code

1. What are the common symptoms of OBDII code B1C84 (Heated Rear Window Relay Output) in a Mercury?

- The common symptoms include a non-functioning or intermittently working heated rear window.

2. What could cause the OBDII code B1C84 in a Mercury?

- The code B1C84 is typically triggered by a faulty relay or wiring issue related to the heated rear window system.

3. How can I diagnose the cause of the OBDII code B1C84 in my Mercury?

- You can start by checking the relay associated with the heated rear window, inspecting the wiring for any damage, and ensuring the window itself is in good condition.

4. Is it safe to continue driving my Mercury with the OBDII code B1C84 active?

- While it is generally safe to drive with this code, it is recommended to address the issue promptly to ensure the proper functioning of the heated rear window.

5. Can I repair the OBDII code B1C84 in my Mercury myself?

- Depending on your level of automotive repair experience, you may be able to replace the faulty relay or repair the wiring yourself. Otherwise, seeking assistance from a professional mechanic is advisable.

6. Are there any temporary fixes for the OBDII code B1C84 in a Mercury?

- A temporary fix could involve checking and securing any loose connections related to the heated rear window system to see if that resolves the issue temporarily.

7. Will resetting the OBDII code B1C84 in my Mercury make it go away permanently?

- Resetting the code may temporarily turn off the warning light, but if the underlying issue with the heated rear window system is not addressed, the code is likely to reappear.

8. How much does it typically cost to repair the OBDII code B1C84 in a Mercury at a repair shop?

- The cost of repairing the OBDII code B1C84 can vary depending on the exact cause of the issue, but it may range from $100 to $300 at a repair shop.

9. Can extreme weather conditions affect the triggering of the OBDII code B1C84 in a Mercury?

- Yes, extreme cold or heat can sometimes exacerbate issues with the heated rear window system, potentially leading to the activation of the B1C84 trouble code.

10. Is the OBDII code B1C84 specific to Mercury vehicles, or can it occur in other car makes as well?

- While the B1C84 code is associated with Mercury vehicles, similar issues with heated rear window relays and outputs can occur in other car makes and models.