AutoCodes – Ford – B1C77 Ford

B1C77 Ford Code - Rear Wiper Relay Circuit

Quick Answer

The Body Control Module (BCM) monitors the Rear Wiper Relay. Common causes include Faulty Rear Wiper Relay, Rear Wiper Relay harness is open or shorted, Rear Wiper 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: B1C77 Ford indicates Rear Wiper Relay Circuit.
Common causes: Common causes include Faulty Rear Wiper Relay, Rear Wiper Relay harness is open or shorted, Rear Wiper 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 6,043

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B1C77 Ford Description

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

OBDII Code B1C77 Ford - Rear Wiper Relay Circuit - AutoCodes.com — B1C77 Ford Code - Rear Wiper Relay Circuit

What does this mean?

What are the Possible Causes of the DTC B1C77 Ford?

Faulty Rear Wiper Relay
Rear Wiper Relay harness is open or shorted
Rear Wiper Relay circuit poor electrical connection

How to Fix the DTC B1C77 Ford?

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

B1C77:11 Rear Wiper Relay Circuit Short To Ground
B1C77:13 Rear Wiper Relay Circuit Open
B1C77:19 Rear Wiper Relay Circuit Current Above Threshold

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1C77 Ford 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 B1C77 Ford code?

Need more information on how to fix the B1C77 Ford code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1C77 Ford code diagnosed by a professional: Find a repair shop in your area

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 B1C77 Ford Code

1. What are common symptoms of OBDII code B1C77 in a Ford related to the Rear Wiper Relay Circuit?

The common symptoms include a non-functioning rear wiper, erratic wiper operation, or the rear wiper getting stuck in one position.

2. What are the potential causes of OBDII code B1C77 in a Ford related to the Rear Wiper Relay Circuit?

Potential causes may include a faulty rear wiper relay, damaged wiring or connectors in the circuit, or issues with the rear wiper motor itself.

3. How can I diagnose the cause of OBDII code B1C77 in a Ford related to the Rear Wiper Relay Circuit?

You can start by inspecting the rear wiper relay, checking the wiring and connectors for any damage, and testing the rear wiper motor for proper functionality using a multimeter.

4. Can I reset OBDII code B1C77 in a Ford related to the Rear Wiper Relay Circuit by disconnecting the battery?

While disconnecting the battery may clear the code temporarily, it is important to diagnose and address the root cause of the issue to prevent the code from reoccurring.

5. What are some repair tips for addressing OBDII code B1C77 in a Ford related to the Rear Wiper Relay Circuit?

Repair tips may include replacing the rear wiper relay, repairing or replacing damaged wiring or connectors, and ensuring proper functioning of the rear wiper motor.

6. Is it safe to continue driving my Ford with OBDII code B1C77 related to the Rear Wiper Relay Circuit?

It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure the rear wiper functions correctly, especially in adverse weather conditions.

7. Can extreme weather conditions impact the occurrence of OBDII code B1C77 related to the Rear Wiper Relay Circuit in a Ford?

Yes, extreme weather conditions such as heavy rain, snow, or freezing temperatures can put additional strain on the rear wiper system and potentially trigger this code if there are underlying issues.

8. How can I prevent OBDII code B1C77 related to the Rear Wiper Relay Circuit from occurring in my Ford?

Regularly maintaining and inspecting the rear wiper system, including the relay, wiring, and motor, can help prevent issues that lead to this code. Additionally, parking the vehicle in a sheltered area during extreme weather can also help.

9. Are there any recalls or technical service bulletins related to OBDII code B1C77 in Ford vehicles with issues in the Rear Wiper Relay Circuit?

It's recommended to check with your local Ford dealership or visit the NHTSA website to see if there are any recalls or technical service bulletins related to this specific OBDII code and issue in the Rear Wiper Relay Circuit.

10. Can a DIY enthusiast with basic automotive knowledge repair OBDII code B1C77 related to the Rear Wiper Relay Circuit in a Ford?

Yes, someone with basic automotive knowledge and the right tools can potentially diagnose and repair this issue themselves by following repair guides or seeking assistance from online forums or resources.