B1243 Lexus 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 Lexus 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 Lexus Description
What are the Possible Causes of the DTC B1243 Lexus?
- 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 Lexus?
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 Lexus 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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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 Lexus Code
1. What are the common symptoms of OBDII code B1243 in a Lexus related to the GSW terminal circuit malfunction?
- Common symptoms include issues with the vehicle's power windows, power door locks, or other electrical components not functioning properly.
2. What can cause the GSW terminal circuit malfunction in a Lexus triggering the B1243 code?
- The malfunction can be caused by wiring issues, a faulty door control module, a malfunctioning power window switch, or a problem with the GSW terminal itself.
3. How can I diagnose the GSW terminal circuit malfunction triggering the B1243 code in my Lexus?
- Diagnosis typically involves checking the wiring connections, inspecting the power window switches, testing the door control module, and ensuring the GSW terminal is functioning correctly.
4. Can I continue driving my Lexus with the B1243 code related to the GSW terminal circuit malfunction?
- While the vehicle may still be drivable, it is recommended to address the issue promptly to prevent further electrical problems or potential safety concerns.
5. How can I repair the GSW terminal circuit malfunction causing the B1243 code in my Lexus?
- Repair may involve repairing or replacing damaged wiring, replacing the faulty door control module, replacing a malfunctioning power window switch, or addressing any issues with the GSW terminal.
6. Are there any DIY tips for fixing the GSW terminal circuit malfunction triggering the B1243 code in my Lexus?
- DIY tips may include checking and securing wiring connections, cleaning power window switches, and performing basic electrical tests using a multimeter to identify the issue.
7. How much does it cost to repair the GSW terminal circuit malfunction related to the B1243 code in a Lexus?
- Repair costs can vary depending on the specific cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.
8. Will resetting the OBDII code B1243 related to the GSW terminal circuit malfunction make the issue go away?
- Simply resetting the code may temporarily clear the warning light, but it will not fix the underlying problem causing the GSW terminal malfunction.
9. Can extreme weather conditions contribute to the GSW terminal circuit malfunction in a Lexus and trigger the B1243 code?
- Yes, extreme temperatures or moisture can potentially cause electrical issues leading to the GSW terminal malfunction, so it's important to keep the vehicle protected.
10. Is it necessary to take my Lexus to a dealership for repair if I encounter the B1243 code related to the GSW terminal circuit malfunction?
- While a dealership may have specialized knowledge, an experienced independent mechanic can also diagnose and repair the issue effectively, potentially at a lower cost.
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