B1243 Code - GSW Terminal Circuit Malfunction
Quick Answer
If the collision door lock release function does not operate normally, or an open or short in the GSW input circuit of the Main Body ECU is detected, Diagnostic Trouble Code (DTC) B1243 will be stored. Common causes include Faulty Airbag Sensor Assembly, Airbag Sensor Assembly harness is open or shorted, Airbag Sensor Assembly 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
- B1243 indicates GSW Terminal Circuit Malfunction.
- Common causes
- Common causes include Faulty Airbag Sensor Assembly, Airbag Sensor Assembly harness is open or shorted, Airbag Sensor Assembly 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.
Code B1243 Description
What are the Possible Causes of the DTC B1243?
- Faulty Airbag Sensor Assembly
- Airbag Sensor Assembly harness is open or shorted
- Airbag Sensor Assembly circuit poor electrical connection
- Faulty Main Body ECU
How to Fix the DTC B1243?
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 B1243 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.
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Information for Specific Makes
- B1243 Lexus — GSW Terminal Circuit Malfunction
- B1243 Scion — GSW Terminal Circuit Malfunction
- B1243 Toyota — GSW Terminal Circuit Malfunction
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.
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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