B1720 DTC Code: A Comprehensive Guide


In today’s automotive world, cars are equipped with sophisticated systems that monitor and control various aspects of their performance. When something goes wrong, the vehicle’s onboard computer generates Diagnostic Trouble Codes (DTCs) to help diagnose the issue. One such DTC is the B1720 code. In this article, we will delve deep into the B1720 DTC code, covering its meaning, causes, symptoms, and possible solutions.

Understanding the B1720 DTC Code

What is the B1720 DTC Code?

The B1720 DTC code is a manufacturer-specific trouble code that stands for “Seat Rear Up Switch Circuit Short to Ground.” This code indicates that there is a malfunction in the circuit responsible for the rear seat up switch, leading to a short circuit to the ground.

How does the B1720 DTC Code work?

When the rear seat up switch circuit experiences a short to the ground, it means that the electrical current flowing through the circuit is taking an unintended path. This short-circuiting can occur due to damaged wiring, loose connections, or a faulty switch. The B1720 DTC code is triggered as a result of the abnormal electrical activity detected by the vehicle’s computer.

Symptoms of the B1720 DTC Code

When the B1720 DTC code is present, the affected vehicle may exhibit a range of symptoms. It is crucial to be aware of these symptoms to identify the issue promptly. Here are some common signs associated with the B1720 code:

  1. Non-functional rear seat up switch: One of the most noticeable symptoms is the failure of the rear seat up switch to perform its intended function. When the B1720 code is active, pressing the switch will not result in the expected activation of the rear seat adjustment mechanism.

  2. Illuminated warning light: The vehicle’s dashboard may display a warning light, indicating a fault in the rear seat up switch circuit. This light may vary depending on the make and model of the vehicle but is usually accompanied by the check engine light.

  3. Erratic seat movement: Some users have reported erratic behavior in the rear seat adjustment mechanism when the B1720 DTC code is present. The seat may move unexpectedly or exhibit jerky movements, making it difficult to achieve the desired seating position.

Causes of the B1720 DTC Code

Several factors can contribute to the triggering of the B1720 code. These causes can vary depending on the vehicle’s make, model, and manufacturing year. Some common causes include:

  • Damaged wiring: Over time, the wiring responsible for connecting the rear seat up switch can become damaged due to wear and tear or external factors, such as exposure to extreme temperatures or rodents.

  • Loose connections: In some cases, the issue may stem from loose or corroded connections. Loose connections can disrupt the electrical flow and result in a short to the ground, triggering the B1720 DTC code.

  • Faulty switch: A faulty rear seat up switch can also cause the code to appear. Malfunctions within the switch can disrupt the electrical circuit, leading to a short to the ground.

Diagnosing and Resolving the B1720 DTC Code

To effectively diagnose and resolve the B1720 DTC code, it is recommended to follow these steps:

  1. Scan the vehicle: Use an OBD-II scanner to retrieve the stored trouble code(s). This will confirm the presence of the B1720 code and enable further troubleshooting.

  2. Inspect wiring and connections: Thoroughly inspect the wiring and connectors associated with the rear seat up switch circuit. Look for any signs of damage, corrosion, or loose connections. Repair or replace any faulty components as necessary.

  3. Test the rear seat up switch: Test the rear seat up switch using a multimeter or a specialized switch testing tool. Check for continuity and proper electrical functionality. Replace the switch if it fails the tests.

  4. Clear the code: After addressing the underlying issue, use the OBD-II scanner to clear the trouble code(s) stored in the vehicle’s computer. This will reset the system and verify if the repair was successful.

Frequently Asked Questions

Q1: Can I continue driving with the B1720 DTC code?

A1: While you may still be able to drive your vehicle with the B1720 DTC code, it is advisable to address the issue promptly. Ignoring the problem can lead to further damage, affect the rear seat adjustments, or result in potential safety hazards.

Q2: Can I fix the B1720 DTC code myself?

A2: If you have intermediate to advanced automotive knowledge and the necessary tools, you may attempt to diagnose and fix the B1720 code yourself. However, if you are uncertain or lack the expertise, it is recommended to seek professional assistance to prevent any inadvertent errors.

Q3: Will resetting the code resolve the issue permanently?

A3: Simply resetting the code will not guarantee a permanent resolution. It is essential to identify and address the underlying cause of the B1720 DTC code. By fixing the root problem, you can minimize the chances of the code reappearing in the future.

In conclusion, the B1720 DTC code signifies a short to the ground in the rear seat up switch circuit. It is crucial to diagnose and rectify the issue promptly to restore the functionality of the switch and ensure optimal seat adjustment. Remember to follow appropriate diagnostic procedures and, if necessary, consult with a professional to resolve the B1720 code effectively.

About author


Meet Sam Mitchell, your experienced and reliable guide in the complex world of car fault codes. With a robust career spanning over 15 years as a professional car mechanic, John has the skills, knowledge, and practical experience to help you navigate car fault issues with confidence.


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