B1920 Lexus Code - Short In Rear Pretensioner Squib RH Circuit
Quick Answer
The B1920 code for Lexus vehicles indicates a short in the rear pretensioner squib RH circuit. Common causes include Damaged wiring in the rear pretensioner squib RH circuit, Faulty pretensioner squib in the right rear seatbelt, Corrosion in the connectors of the circuit. 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
- B1920 Lexus indicates Short In Rear Pretensioner Squib RH Circuit.
- Common causes
- Common causes include Damaged wiring in the rear pretensioner squib RH circuit, Faulty pretensioner squib in the right rear seatbelt, Corrosion in the connectors of the circuit.
- 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 B1920 Lexus Description
The B1920 code for Lexus vehicles indicates a short in the rear pretensioner squib RH circuit. In simpler terms, this means that there is an issue with the circuit that controls the pretensioner in the right rear seatbelt. The pretensioner is a safety feature that tightens the seatbelt in the event of a collision, reducing the risk of injury to the occupants. When there is a short in this circuit, the pretensioner may not function properly, compromising the safety of the vehicle.
Common Causes of B1920 Lexus
- Damaged wiring in the rear pretensioner squib RH circuit.
- Faulty pretensioner squib in the right rear seatbelt.
- Corrosion in the connectors of the circuit.
- Issues with the airbag control module.
Symptoms of B1920 Lexus
- Airbag warning light illuminated on the dashboard.
- Seatbelt pretensioner not tightening during sudden stops or collisions.
- Diagnostic trouble code B1920 stored in the vehicle's computer.
- Inoperative right rear seatbelt.
How to Fix B1920 Lexus
- Begin by disconnecting the vehicle's battery to prevent accidental deployment of the airbag system.
- Inspect the wiring harness and connectors in the rear pretensioner squib RH circuit for any damage or corrosion. Repair or replace as necessary.
- Test the pretensioner squib in the right rear seatbelt to determine if it is faulty. Replace if needed.
- Clear the diagnostic trouble code from the vehicle's computer using a diagnostic tool.
- Reconnect the battery and test the seatbelt pretensioner to ensure it functions correctly.
Cost to Fix B1920 Lexus
The cost of repairing a short in the rear pretensioner squib RH circuit can vary depending on the extent of the damage and the specific components that need to be replaced. On average, the parts for this repair could range from $100 to $300, while the labor costs may be between $150 and $300. It's important to note that these are rough estimates, and actual costs may vary based on the location of the repair shop, the vehicle's make and model, and any additional issues that are discovered during the repair process. It's recommended to consult with a professional mechanic to get a more accurate cost estimate for this repair.
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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 B1920 Lexus Code
1. What are the common symptoms of OBDII code B1920 in a Lexus related to a short in the rear pretensioner squib RH circuit?
The common symptoms include the airbag warning light illuminating on the dashboard, potential non-deployment of the seatbelt pretensioner system in the event of a collision, and diagnostic trouble codes stored in the vehicle's computer system.
2. What could cause the OBDII code B1920 in a Lexus indicating a short in the rear pretensioner squib RH circuit?
Possible causes of this code include damaged wiring or connectors in the rear pretensioner squib RH circuit, a faulty pretensioner squib unit, or issues with the vehicle's airbag control module.
3. How can I diagnose the OBDII code B1920 in a Lexus for a short in the rear pretensioner squib RH circuit?
Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific fault code, inspecting the wiring and connectors in the rear pretensioner squib RH circuit for damage, and testing the pretensioner squib unit for proper functionality.
4. Is it safe to drive a Lexus with the OBDII code B1920 indicating a short in the rear pretensioner squib RH circuit?
It is not recommended to drive the vehicle with this code present, as it could compromise the effectiveness of the seatbelt pretensioner system in the event of a collision. We advise getting the issue addressed by a qualified mechanic as soon as possible.
5. Can I repair the OBDII code B1920 related to a short in the rear pretensioner squib RH circuit in a Lexus myself?
Due to the safety implications associated with airbag systems, it is recommended to have this issue diagnosed and repaired by a professional technician with experience in handling airbag-related faults to ensure proper repairs and system functionality.
6. Are there any recalls or technical service bulletins related to the OBDII code B1920 in Lexus vehicles?
It is advisable to check with authorized Lexus dealerships or visit the National Highway Traffic Safety Administration website to see if there are any recalls or technical service bulletins related to the specific issue of a short in the rear pretensioner squib RH circuit.
7. How much does it typically cost to repair the OBDII code B1920 for a short in the rear pretensioner squib RH circuit in a Lexus?
The cost of repairing this issue can vary depending on the specific cause of the fault, the extent of the repairs needed, and labor rates in your area. It is recommended to obtain quotes from reputable repair shops for an accurate estimate.
8. Can resetting the OBDII code B1920 related to a short in the rear pretensioner squib RH circuit in a Lexus resolve the issue?
Simply clearing the fault code without addressing the underlying cause, such as a short in the rear pretensioner squib RH circuit, will not fix the problem. It is essential to diagnose and repair the root cause of the code to ensure the safety and functionality of the airbag system.
9. How long does it typically take to repair the OBDII code B1920 for a short in the rear pretensioner squib RH circuit in a Lexus?
The repair time can vary depending on the complexity of the issue and the availability of parts. It is advisable to consult with a professional technician to get an estimate of the repair timeline based on your specific situation.
10. What precautions should be taken when working on the OBDII code B1920 indicating a short in the rear pretensioner squib RH circuit in a Lexus?
When dealing with issues related to airbag systems, it is crucial to disconnect the vehicle's battery and wait for a specified amount of time before starting any repair work to prevent accidental deployment of the airbags. It is also recommended to follow proper safety procedures outlined in the vehicle's service manual.
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