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Engine-Codes – Generic – B1C77

B1C77 Code - Rear Wiper Relay Circuit

Quick Answer

The B1C77 code refers to a fault in the rear wiper relay circuit of the vehicle. Common causes include Faulty rear wiper relay, Loose or corroded electrical connections in the rear wiper circuit, Damage to the wiring harness of the rear wiper system. 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 indicates Rear Wiper Relay Circuit.
Common causes
Common causes include Faulty rear wiper relay, Loose or corroded electrical connections in the rear wiper circuit, Damage to the wiring harness of the rear wiper system.
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 Aug 30, 2024
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Code B1C77 Description

The B1C77 code refers to a fault in the rear wiper relay circuit of the vehicle. The rear wiper relay is responsible for controlling the operation of the rear windshield wiper. When this circuit malfunctions, it can lead to the rear wiper not working properly or not working at all. This can be a safety hazard, especially during inclement weather when visibility is crucial.

OBDII Code B1C77 - Rear Wiper Relay Circuit
B1C77 Code - Rear Wiper Relay Circuit

Common Causes of B1C77

  1. Faulty rear wiper relay.
  2. Loose or corroded electrical connections in the rear wiper circuit.
  3. Damage to the wiring harness of the rear wiper system.
  4. Issues with the rear wiper motor.
  5. Water or moisture intrusion affecting the rear wiper components.

Symptoms of B1C77

  1. Rear wiper not working at all.
  2. Rear wiper working intermittently or erratically.
  3. Rear wiper getting stuck in one position.
  4. Rear wiper not turning off when switched off.
  5. Rear wiper operating at an incorrect speed.

How to Fix B1C77

  1. Begin by inspecting the rear wiper relay and testing it for functionality.
  2. Check all electrical connections in the rear wiper circuit for tightness and corrosion.
  3. Inspect the wiring harness for any visible damage or wear and repair or replace as needed.
  4. Test the rear wiper motor for proper operation and replace if necessary.
  5. Clear any water or moisture from the rear wiper components and ensure they are properly sealed.

Cost to Fix B1C77

The cost of repairing a rear wiper relay circuit issue can vary depending on the specific cause of the problem and the extent of the repair needed. On average, you can expect to pay between $100 to $300 for parts and labor. However, as mentioned earlier, rates can vary based on location and the type of vehicle. It's recommended to get a few quotes from different auto repair shops to find the best price for your specific situation.

What does this mean?

Tech Notes for B1C77

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

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Code B1C77 Information for Specific Makes

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 Code

1. What are common symptoms of OBDII code B1C77 (Rear Wiper Relay Circuit)?

The common symptoms of OBDII code B1C77 include the rear wiper not functioning properly or not working at all.

2. What are the possible causes of OBDII code B1C77 (Rear Wiper Relay Circuit)?

Possible causes of OBDII code B1C77 include a faulty rear wiper relay, damaged wiring or connectors in the rear wiper circuit, or a malfunctioning rear wiper motor.

3. How can I diagnose OBDII code B1C77 (Rear Wiper Relay Circuit)?

Diagnosing OBDII code B1C77 involves inspecting the rear wiper relay, checking the wiring and connectors in the rear wiper circuit for damage, and testing the rear wiper motor for proper functionality.

4. Can I still drive my vehicle with OBDII code B1C77 (Rear Wiper Relay Circuit)?

It is generally safe to drive your vehicle with OBDII code B1C77, but it is essential to address the issue promptly to ensure the rear wiper functions correctly, especially in adverse weather conditions.

5. How do I repair OBDII code B1C77 (Rear Wiper Relay Circuit)?

Repairing OBDII code B1C77 involves replacing the faulty rear wiper relay, repairing or replacing damaged wiring or connectors in the rear wiper circuit, or replacing the rear wiper motor if necessary.

6. Can weather conditions affect OBDII code B1C77 (Rear Wiper Relay Circuit)?

Extreme weather conditions, such as heavy rain or snow, can potentially exacerbate issues related to OBDII code B1C77 by putting additional strain on the rear wiper system.

7. How long does it take to repair OBDII code B1C77 (Rear Wiper Relay Circuit)?

The time it takes to repair OBDII code B1C77 varies depending on the specific issue, but it typically takes anywhere from 30 minutes to a few hours to diagnose and fix the problem.

8. Is OBDII code B1C77 (Rear Wiper Relay Circuit) a common issue in vehicles?

OBDII code B1C77 is a relatively common issue in vehicles with rear wipers, especially in older vehicles or those exposed to harsh environmental conditions.

9. Can I reset OBDII code B1C77 (Rear Wiper Relay Circuit) by disconnecting the battery?

Disconnecting the battery may clear the code temporarily, but it is not a recommended solution. It is best to diagnose the root cause of the issue and address it accordingly to prevent the code from reoccurring.

10. Does OBDII code B1C77 (Rear Wiper Relay Circuit) affect vehicle safety?

While OBDII code B1C77 may not directly impact the safety of driving the vehicle, having a malfunctioning rear wiper can compromise visibility, especially during adverse weather conditions, making it important to address the issue promptly.

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