AutoCodes – Generic – B1790

B1790 Code - Center Airbag Sensor Assembly Communication Circuit Malfunction

Quick Answer

The Center Airbag Sensor Assembly Communication Circuit consists of the Occupant Detection ECU and the Center Airbag Sensor Assembly. Common causes include Faulty Occupant Detection ECU, Occupant Detection ECU harness is open or shorted, Occupant Detection ECU 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: B1790 indicates Center Airbag Sensor Assembly Communication Circuit Malfunction.
Common causes: Common causes include Faulty Occupant Detection ECU, Occupant Detection ECU harness is open or shorted, Occupant Detection ECU 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.

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Code Popularity 15,022

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1790 Description

The Center Airbag Sensor Assembly Communication Circuit consists of the Occupant Detection ECU and the Center Airbag Sensor Assembly. The Diagnostic Trouble Code (DTC) B1790 is recorded when a malfunction is detected in the Center Airbag Sensor Assembly Communication Circuit.

OBDII Code B1790 - Center Airbag Sensor Assembly Communication Circuit Malfunction - AutoCodes.com — B1790 Code - Center Airbag Sensor Assembly Communication Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC B1790?

Faulty Occupant Detection ECU
Occupant Detection ECU harness is open or shorted
Occupant Detection ECU circuit poor electrical connection
Faulty Center Airbag Sensor Assembly

How to Fix the DTC B1790?

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 B1790 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.

Need more information about the B1790 code?

Need more information on how to fix the B1790 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1790 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1790 Buick — Driver Seat Motor Lumbar Circuit
B1790 Cadillac — Driver Seat Motor Lumbar Circuit
B1790 Chevrolet — Driver Seat Motor Lumbar Circuit
B1790 GMC — Driver Seat Motor Lumbar Circuit
B1790 Lexus — Center Airbag Sensor Assembly Communication Circuit Malfunction
B1790 Pontiac — Driver Seat Motor Lumbar Circuit
B1790 Saturn — Driver Seat Motor Lumbar Circuit
B1790 Scion — Center Airbag Sensor Assembly Communication Circuit Malfunction
B1790 Toyota — Center Airbag Sensor Assembly Communication 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.

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 B1790 Code

1. What are the common symptoms of OBDII code B1790 (Center Airbag Sensor Assembly Communication Circuit Malfunction)?

- Common symptoms include the airbag warning light illuminated on the dashboard, intermittent or constant issues with the airbag system, and potential non-deployment of the airbags in case of an accident.

2. What are the possible causes of OBDII code B1790?

- The code B1790 may be triggered by issues such as a faulty center airbag sensor assembly, damaged wiring or connectors in the communication circuit, or a communication breakdown between the sensor and the airbag control module.

3. How can I diagnose the source of OBDII code B1790?

- Diagnosis typically involves using a scan tool to read the trouble code, inspecting the wiring and connectors in the communication circuit, testing the center airbag sensor assembly, and checking for any loose connections or damage.

4. Can driving with OBDII code B1790 pose a safety risk?

- Yes, driving with this code present can be risky as it indicates a malfunction in the airbag system, potentially leading to non-deployment of airbags in the event of a collision. It is recommended to address the issue promptly.

5. Is it possible to reset OBDII code B1790 without fixing the underlying issue?

- Simply clearing the code without addressing the root cause is not recommended as it will likely reappear once the issue persists. It is crucial to diagnose and repair the problem to ensure the airbag system functions correctly.

6. Are there any DIY repair tips for fixing OBDII code B1790?

- DIY repair options may include checking and securing the wiring connections, inspecting for any visible damage, and ensuring the center airbag sensor assembly is properly connected and functioning. However, for complex issues, professional help may be necessary.

7. How much does it typically cost to repair OBDII code B1790?

- The cost of repair can vary depending on the exact cause of the code, the extent of the damage, and the labor rates in your area. It is advisable to consult a mechanic or dealership for a more accurate estimate.

8. Can OBDII code B1790 be triggered by a low battery voltage?

- Yes, low battery voltage or electrical issues can sometimes trigger communication circuit malfunctions, leading to the B1790 trouble code. Ensuring a healthy battery and electrical system can help prevent such issues.

9. Will OBDII code B1790 prevent my vehicle from passing an emissions test?

- In most cases, the B1790 code is related to the airbag system and should not affect the vehicle's emissions. However, it is essential to address the issue for safety reasons and to prevent any potential future problems.

10. How long can I safely drive with OBDII code B1790 before getting it repaired?

- It is recommended not to delay repairs for OBDII code B1790, especially since it involves the airbag system. Continuing to drive with this code unresolved may compromise the safety features of your vehicle, so prompt attention is advisable.