B1157 Code - Front Airbag Sensor RH Malfunction
Quick Answer
The Front Airbag Sensor (Right Side) circuit consists of the Airbag Sensor Assembly and Front Airbag Sensor RH. Common causes include Faulty Front Airbag Sensor (Right Side), Front Airbag Sensor harness is open or shorted, Front Airbag Sensor 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
- B1157 indicates Front Airbag Sensor RH Malfunction.
- Common causes
- Common causes include Faulty Front Airbag Sensor (Right Side), Front Airbag Sensor harness is open or shorted, Front Airbag Sensor 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 B1157 Description
What are the Possible Causes of the DTC B1157?
- Faulty Front Airbag Sensor (Right Side)
- Front Airbag Sensor harness is open or shorted
- Front Airbag Sensor circuit poor electrical connection
- Faulty Airbag Sensor Assembly
How to Fix the DTC B1157?
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 B1157 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
- B1157 Acura — Gauge Control Module Lost Communication With Multiplex Integrated Control Unit
- B1157 Honda — Gauge Control Module Lost Communication With Multiplex Integrated Control Unit
- B1157 Lexus — Front Airbag Sensor RH Malfunction
- B1157 Scion — Front Airbag Sensor RH Malfunction
- B1157 Toyota — Front Airbag Sensor RH 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 B1157 Code
1. What are the common symptoms of OBDII code B1157 - Front Airbag Sensor RH Malfunction?
- The common symptoms include the airbag warning light illuminated on the dashboard and a potential non-deployment of the front right airbag during an accident.
2. What are the possible causes of OBDII code B1157?
- The code B1157 can be triggered by issues such as a faulty front airbag sensor on the right side, damaged wiring or connectors in the airbag system, or a problem with the airbag control module.
3. How can I diagnose the Front Airbag Sensor RH Malfunction?
- Diagnosing the issue involves using a diagnostic scan tool to retrieve the specific trouble code (B1157), checking the wiring and connectors for any visible damage, and testing the front airbag sensor for proper functionality.
4. Can I continue driving with OBDII code B1157 present?
- It is not recommended to drive with the B1157 code active, as it indicates a potential malfunction in the front airbag system, which can compromise the safety of the vehicle occupants in the event of a collision.
5. How can I repair OBDII code B1157 - Front Airbag Sensor RH Malfunction?
- Repairing the B1157 code typically involves replacing the front airbag sensor on the right side, repairing any damaged wiring or connectors, and clearing the trouble code with a diagnostic tool after the repair.
6. Are there any safety precautions to consider when working on the airbag system?
- When working on the airbag system, it is crucial to disconnect the vehicle's battery and wait for at least 10 minutes to allow the capacitors to discharge, thus reducing the risk of accidental airbag deployment.
7. Can a DIY enthusiast fix OBDII code B1157 at home?
- While some experienced DIY enthusiasts may be able to diagnose and repair the B1157 code, working on the airbag system requires specific knowledge and precautions due to the safety implications. It is recommended to seek professional help for airbag system repairs.
8. How much does it cost to repair OBDII code B1157?
- The cost of repairing the B1157 code can vary depending on the exact cause of the malfunction, the cost of parts needed for the repair, and labor charges. It is advisable to consult a mechanic for an accurate estimate.
9. Will resetting the trouble code fix the underlying issue with the airbag sensor?
- Simply resetting the trouble code without addressing the underlying issue, such as a faulty airbag sensor, will not fix the problem. It is essential to diagnose and repair the root cause of the malfunction to ensure the airbag system's proper operation.
10. Is it safe to attempt to reset the B1157 trouble code without fixing the issue?
- It is not recommended to reset the B1157 trouble code without fixing the underlying problem, as it can compromise the safety features of the airbag system and put the vehicle occupants at risk in case of an accident.
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