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Engine-Codes – Generic – B1621

B1621 Code - Wiper Rear Low Limit Input Circuit Short To Battery

Quick Answer

The B1621 diagnostic trouble code (DTC) indicates a problem with the Wiper Rear Low Limit Input Circuit Short to Battery. Common causes include Damaged or chafed wiring in the rear wiper circuit, Faulty rear wiper motor, Defective rear wiper 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
B1621 indicates Wiper Rear Low Limit Input Circuit Short To Battery.
Common causes
Common causes include Damaged or chafed wiring in the rear wiper circuit, Faulty rear wiper motor, Defective rear wiper 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 08, 2024
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Code B1621 Description

The B1621 diagnostic trouble code (DTC) indicates a problem with the Wiper Rear Low Limit Input Circuit Short to Battery. In simpler terms, this means that there is a short circuit in the wiring that controls the rear wiper system of the vehicle. The rear wiper system is responsible for clearing the rear window of the vehicle, providing visibility for the driver. When this circuit malfunctions, it can lead to the rear wiper not functioning properly or not working at all.

OBDII Code B1621 - Wiper Rear Low Limit Input Circuit Short To Battery
B1621 Code - Wiper Rear Low Limit Input Circuit Short To Battery

Common Causes of B1621

  1. Damaged or chafed wiring in the rear wiper circuit.
  2. Faulty rear wiper motor.
  3. Defective rear wiper switch.
  4. Malfunctioning control module for the rear wiper system.
  5. Corrosion or poor connections in the rear wiper circuit.

Symptoms of B1621

  1. Rear wiper not responding to control inputs.
  2. Rear wiper operating erratically or intermittently.
  3. Rear wiper getting stuck or stopping mid-operation.
  4. Fuse for the rear wiper repeatedly blowing.
  5. Dashboard warning light indicating a fault in the rear wiper system.

How to Fix B1621

  1. Begin by diagnosing the exact location of the short circuit using a multimeter and wiring diagram.
  2. Inspect the wiring harness for any visible damage, chafing, or corrosion. Repair or replace any damaged wiring.
  3. Test the rear wiper motor and switch for proper functionality. Replace any faulty components.
  4. Check the control module for the rear wiper system and ensure it is functioning correctly. Replace if necessary.
  5. Clear the trouble codes from the vehicle's computer system after completing the repairs and test the rear wiper system to ensure proper operation.

Cost to Fix B1621

The typical repair costs for addressing a Wiper Rear Low Limit Input Circuit Short to Battery code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts for this repair could range from $50 to $200, while the labor costs could amount to $100 to $300. However, it is essential to note that the actual costs may differ based on the location, vehicle make and model, and the hourly labor rates of the auto repair shop. It is advisable to obtain quotes from multiple repair shops to get a more accurate estimate for this repair.

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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 B1621 Code

1. What are common symptoms of OBDII code B1621 (Wiper Rear Low Limit Input Circuit Short To Battery)?

- Common symptoms include the rear wiper not working, the rear wiper operating erratically, or the wiper getting stuck in one position.

2. What can cause OBDII code B1621 to trigger?

- This code is typically triggered by a short circuit between the rear wiper motor's low limit input circuit and the battery.

3. How can I diagnose the issue related to code B1621?

- You can diagnose the issue by checking the wiring harness for any visible damage, inspecting the wiper motor connections, and testing the rear wiper switch.

4. Can a blown fuse cause OBDII code B1621 to appear?

- Yes, a blown fuse related to the rear wiper system can also trigger code B1621, so it's important to check the fuses as part of the diagnosis.

5. What are some repair tips for resolving OBDII code B1621?

- Repair tips include repairing any damaged wiring, replacing the rear wiper motor if necessary, ensuring proper grounding, and resetting the trouble code after fixing the issue.

6. Is it safe to continue driving with OBDII code B1621 present?

- It is generally safe to drive with this code, but it is recommended to address the issue promptly to ensure the proper functioning of the rear wiper system.

7. Are there any recalls or technical service bulletins related to OBDII code B1621?

- Check with your vehicle manufacturer or dealership for any recalls or technical service bulletins related to this specific OBDII code to see if there are known issues or remedies.

8. Can extreme weather conditions contribute to the occurrence of code B1621?

- Yes, extreme weather conditions like heavy rain, snow, or extreme temperatures can sometimes exacerbate electrical issues, leading to code B1621 triggering.

9. Do I need specialized tools to fix OBDII code B1621?

- While specialized tools may not be required for basic inspections, having a multimeter for testing circuits and a scan tool for resetting the trouble code can be helpful in diagnosing and resolving the issue.

10. How long does it typically take to repair OBDII code B1621?

- The repair time can vary depending on the exact cause of the issue and the level of expertise, but resolving code B1621 could take anywhere from 30 minutes to a few hours, including diagnosis and repair.

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