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Engine-Codes – Generic – B1243

B1243 Code - GSW Terminal Circuit Malfunction

Quick Answer

The B1243 diagnostic trouble code (DTC) refers to a GSW (Ground Switched) Terminal Circuit Malfunction. Common causes include Corrosion or damage to the wiring harness connected to the ground switched terminal, Loose or poor connections at the terminal, Faulty ground switch relay. 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
B1243 indicates GSW Terminal Circuit Malfunction.
Common causes
Common causes include Corrosion or damage to the wiring harness connected to the ground switched terminal, Loose or poor connections at the terminal, Faulty ground switch relay.
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 09, 2024
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Code B1243 Description

The B1243 diagnostic trouble code (DTC) refers to a GSW (Ground Switched) Terminal Circuit Malfunction. This code typically indicates that there is an issue with the electrical circuit that controls a ground switched terminal. In modern vehicles, many systems and components rely on ground switched terminals to function properly. When this circuit malfunctions, it can lead to a variety of performance issues and potentially affect multiple vehicle systems.

OBDII Code B1243 - GSW Terminal Circuit Malfunction
B1243 Code - GSW Terminal Circuit Malfunction

Common Causes of B1243

  1. Corrosion or damage to the wiring harness connected to the ground switched terminal
  2. Loose or poor connections at the terminal
  3. Faulty ground switch relay
  4. Electrical short circuits in the circuit
  5. Issues with the vehicle's battery or charging system

Symptoms of B1243

  1. Malfunctioning lights (e.g., headlights, brake lights, turn signals)
  2. Erratic behavior of electronic components (e.g., power windows, door locks)
  3. Inaccurate readings from sensors (e.g., temperature sensor, fuel gauge)
  4. Dashboard warning lights illuminated
  5. Issues with the vehicle's starting or charging system

How to Fix B1243

  1. Begin by conducting a thorough visual inspection of the wiring harness connected to the ground switched terminal. Look for signs of damage, corrosion, or loose connections. Repair or replace any damaged wiring.
  2. Test the ground switch relay to determine if it is functioning correctly. Replace the relay if necessary.
  3. Check for any electrical short circuits in the circuit using a multimeter. Repair or replace any affected components.
  4. Test the vehicle's battery and charging system to ensure they are functioning properly and providing the correct voltage to the ground switched terminal.
  5. Clear the DTC and test the vehicle to ensure that the issue has been resolved.

Cost to Fix B1243

The typical repair costs for addressing a GSW Terminal Circuit Malfunction can vary depending on the extent of the issue and the specific components that need to be repaired or replaced. In general, the cost of parts for this repair can range from $50 to $200, while the labor costs can add an additional $100 to $300 to the total bill. It is important to factor in the specific diagnosis time and labor rates at auto repair shops, which can vary based on factors such as location, vehicle make and model, and engine type. It is recommended to check with local repair shops for a more accurate estimate of the total repair costs.

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Code B1243 Information for Specific Makes

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

  • Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
  • Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
  • Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
  • Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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 B1243 Code

1. What are common symptoms of OBDII code B1243 (GSW Terminal Circuit Malfunction)?

- Common symptoms include issues with the cruise control system, the horn not working, and potential problems with the airbag system.

2. What causes the OBDII code B1243 to trigger?

- The code B1243 is typically triggered by a malfunction in the steering wheel controls or wiring, leading to a disruption in the communication between the control modules.

3. How can I diagnose the GSW terminal circuit malfunction?

- Diagnosis involves inspecting the steering wheel controls, checking the wiring harness for any damage or loose connections, and using a diagnostic scanner to read the specific error codes.

4. Can I still drive my vehicle with the B1243 code present?

- It is generally safe to drive the vehicle with the B1243 code, but it is recommended to address the underlying issue promptly to avoid potential safety concerns or further damage.

5. How can I repair the GSW terminal circuit malfunction?

- Repair options may include fixing or replacing the steering wheel controls, repairing damaged wiring, or resetting the system with a diagnostic tool after fixing the issue.

6. Are there any DIY tips for fixing the B1243 code?

- DIY tips may include checking for loose connections, inspecting the steering wheel controls for physical damage, and ensuring proper grounding of the wiring harness.

7. Will resetting the OBDII code B1243 make it go away permanently?

- Resetting the code may temporarily clear the error, but if the underlying issue is not resolved, the code is likely to reappear once the system detects the malfunction again.

8. Is it necessary to visit a mechanic for the B1243 code repair?

- While some DIY repairs are possible, seeking help from a qualified mechanic is recommended for a thorough diagnosis and proper repair of the GSW terminal circuit malfunction.

9. Can the GSW terminal circuit malfunction lead to other electrical problems in the vehicle?

- Yes, if left unresolved, the GSW terminal circuit malfunction can potentially cause other electrical issues in the vehicle, affecting various control modules and systems.

10. How much does it typically cost to repair the B1243 code?

- The cost of repairing the B1243 code can vary depending on the root cause of the issue, the extent of the damage, and whether any parts need to be replaced, but it can range from a few hundred to a few thousand dollars.

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