AutoCodes – Generic – B1620

B1620 Code - Wiper Rear Low Limit Input Circuit Open

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: B1620 indicates Wiper Rear Low Limit Input Circuit Open.
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 6,547

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 B1620 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 B1620 - Wiper Rear Low Limit Input Circuit Open - AutoCodes.com — B1620 Code - Wiper Rear Low Limit Input Circuit Open

What does this mean?

What are the Possible Causes of the DTC B1620?

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 B1620?

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 B1620 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 B1620 code?

Need more information on how to fix the B1620 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1620 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1620 Lexus — Side Airbag Sensor Right Circuit Malfunction
B1620 Scion — Side Airbag Sensor Right Circuit Malfunction
B1620 Toyota — Side Airbag Sensor Right Circuit Malfunction

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 B1620 Code

1. What are the common symptoms of OBDII code B1620 (Wiper Rear Low Limit Input Circuit Open)?

- The common symptoms include the rear wiper not functioning, the rear wiper not stopping at the correct position, or the rear wiper operating intermittently.

2. What are the possible causes of the OBDII code B1620?

- The code B1620 can be caused by a faulty rear wiper motor, a damaged wiring harness, a defective wiper switch, or a malfunctioning rear wiper module.

3. How can I diagnose the OBDII code B1620 issue?

- To diagnose the issue, you can start by checking the rear wiper fuse, visually inspecting the wiring harness for any damage, testing the rear wiper motor for proper functionality, and using a multimeter to check for continuity in the circuit.

4. What are some DIY repair tips for resolving the Wiper Rear Low Limit Input Circuit Open error?

- DIY repair tips include checking and replacing any blown fuses related to the rear wiper, inspecting and repairing any damaged wiring, ensuring a secure connection at the wiper motor, and testing the rear wiper switch for proper operation.

5. Can I continue driving with the OBDII code B1620 active?

- It is not recommended to continue driving with the B1620 code active, as it may lead to the rear wiper not working when needed, compromising visibility during rainy or snowy conditions.

6. How much does it typically cost to repair the Wiper Rear Low Limit Input Circuit Open issue?

- The cost of repairing the B1620 code can vary depending on the root cause of the problem, but it may range from $100 to $300 for parts and labor.

7. Will resetting the OBDII code B1620 make the issue go away permanently?

- Resetting the code may temporarily clear the error, but if the underlying issue causing the B1620 code is not addressed, the problem is likely to reoccur.

8. Is it possible to prevent the OBDII code B1620 from appearing again in the future?

- Regular maintenance of the rear wiper system, including checking for any signs of wear or damage, can help prevent the recurrence of the B1620 error code.

9. Can extreme weather conditions affect the occurrence of the OBDII code B1620?

- Yes, extreme weather conditions like heavy rain, snow, or exposure to intense sunlight can potentially exacerbate existing issues with the rear wiper system, leading to the B1620 error code.

10. How long does it usually take to repair the Wiper Rear Low Limit Input Circuit Open issue?

- The repair time for the B1620 code can vary depending on the complexity of the issue, but it typically takes around 1-2 hours for a professional technician to diagnose and fix the problem.