AutoCodes – Generic – B1621

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

Quick Answer

The Body Control Module (BCM) monitors the Wiper Rear Low Limit. Common causes include Faulty Wiper Rear Switch, Wiper Rear Switch harness is open or shorted, Wiper Rear Switch 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: B1621 indicates Wiper Rear Low Limit Input Circuit Short To Battery.
Common causes: Common causes include Faulty Wiper Rear Switch, Wiper Rear Switch harness is open or shorted, Wiper Rear Switch 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 6,627

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 May 22, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1621 Description

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

OBDII Code B1621 - Wiper Rear Low Limit Input Circuit Short To Battery - AutoCodes.com — B1621 Code - Wiper Rear Low Limit Input Circuit Short To Battery

What does this mean?

What are the Possible Causes of the DTC B1621?

Faulty Wiper Rear Switch
Wiper Rear Switch harness is open or shorted
Wiper Rear Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1621?

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 B1621 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 B1621 code?

Need more information on how to fix the B1621 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1621 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 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.