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B1660 Toyota Code - Passenger Airbag ON / OFF Indicator Circuit Malfunction

Quick Answer

The B1660 code for Toyota vehicles indicates a malfunction in the Passenger Airbag ON/OFF Indicator Circuit. Common causes include Faulty passenger seat sensor, Wiring issues or loose connections in the indicator circuit, Defective airbag control module. 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
B1660 Toyota indicates Passenger Airbag ON / OFF Indicator Circuit Malfunction.
Common causes
Common causes include Faulty passenger seat sensor, Wiring issues or loose connections in the indicator circuit, Defective airbag control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code B1660 Toyota Description

The B1660 code for Toyota vehicles indicates a malfunction in the Passenger Airbag ON/OFF Indicator Circuit. This circuit is responsible for detecting whether there is a passenger in the front seat and whether the airbag should deploy based on this information. When this circuit malfunctions, it can lead to the airbag system not functioning properly, potentially putting the passenger at risk in the event of a collision. This issue can affect the overall safety of the vehicle and should be addressed promptly to ensure the airbag system operates as intended.

OBDII Code B1660 Toyota - Passenger Airbag ON / OFF Indicator Circuit Malfunction
B1660 Toyota Code - Passenger Airbag ON / OFF Indicator Circuit Malfunction

Common Causes of B1660 Toyota

  1. Faulty passenger seat sensor
  2. Wiring issues or loose connections in the indicator circuit
  3. Defective airbag control module
  4. Impact or damage to the front passenger seat
  5. Corrosion or water damage in the circuitry

Symptoms of B1660 Toyota

  1. The airbag warning light on the dashboard may illuminate and stay on.
  2. The passenger airbag may not deploy in the event of a collision.
  3. The airbag system may display an error message or warning on the instrument cluster.
  4. The passenger airbag ON/OFF indicator may not change when a passenger is seated in the front seat.

How to Fix B1660 Toyota

  1. Begin by diagnosing the specific cause of the malfunction using a diagnostic scanner to retrieve the trouble codes and pinpoint the issue.
  2. Inspect the wiring and connections in the indicator circuit for any damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test the passenger seat sensor to ensure it is functioning correctly. Replace if faulty.
  4. Check the airbag control module for any faults or damage. Replace if necessary.
  5. Clear the trouble codes from the system and perform a test to verify that the indicator circuit is functioning properly and the airbag system is operational.

Cost to Fix B1660 Toyota

The cost of repairing a B1660 code for the Passenger Airbag ON/OFF Indicator Circuit Malfunction can vary depending on the specific cause of the issue and the parts and labor involved. Typically, the repair costs for this type of issue can range from $150 to $500, including parts and labor. However, it's important to note that the actual costs can differ based on the location, vehicle make and model, and the shop's labor rates. It's recommended to consult with a professional mechanic or auto repair shop for a more accurate estimate based on your vehicle's specific needs.

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Information for Specific Toyota Models

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 B1660 Toyota Code

1. What does the OBDII code B1660 mean on a Toyota?

B1660 indicates a malfunction in the Passenger Airbag ON/OFF Indicator Circuit, which may affect the proper operation of the airbag system.

2. What are the common symptoms of the B1660 code?

Symptoms include a malfunctioning or unlit passenger airbag ON/OFF indicator and possibly an illuminated airbag warning light on the dashboard.

3. What causes the B1660 code to appear?

Common causes include a faulty passenger airbag ON/OFF indicator lamp, damaged wiring or connectors in the circuit, or a failed airbag control module.

4. Is it safe to drive with the B1660 code?

Driving with the B1660 code is not recommended, as it may indicate an issue with the airbag system, potentially compromising passenger safety in the event of a collision.

5. How can I diagnose the B1660 code?

Start by checking the passenger airbag ON/OFF indicator for functionality, inspecting wiring and connectors for damage, and using an OBDII scanner to confirm the fault.

6. Can a blown fuse cause the B1660 code?

Yes, a blown fuse related to the airbag system or indicator circuit could trigger the code, so check and replace any blown fuses if necessary.

7. How do I fix the B1660 code on my Toyota?

Repairs may include replacing the faulty passenger airbag ON/OFF indicator lamp, repairing damaged wiring or connectors, or replacing the airbag control module if defective.

8. How much does it cost to fix the B1660 code?

Repair costs vary but typically range from $100 to $500 depending on whether the issue involves wiring repairs, indicator replacement, or a new airbag control module.

9. Can I reset the B1660 code without fixing the problem?

Resetting the code without addressing the underlying issue will likely cause the code to reappear, as the fault remains unresolved.

10. Do I need a professional mechanic to fix the B1660 code?

While some issues like inspecting fuses or connectors can be done at home, diagnosing and repairing airbag system components often requires a professional due to safety concerns.

Discuss the causes and fixes for B1660 Toyota OBDII Code

Submit a New Comment

  • i have a 2005 toyota matrix with code B1660 check the pass seat for any broken wires nothing could it be the on/off indicator switch near the clock

    Reply to Comment

    • Good question. Yes, the B1660 code on your 2005 Toyota Matrix does relate to the passenger airbag ON/OFF indicator circuit, and the little indicator light near the clock is part of that system.

      If you’ve already checked the wiring under the passenger seat and didn’t find anything broken or loose, then yes—it’s very possible the issue is with that indicator module itself or the wiring leading to it.

      Here’s what I’d check next:

      1. Wiggle test – With the key on, lightly tap or move the area around the indicator module and see if the light flickers or the code resets. That can help confirm a bad connection.

      2. Connector corrosion or loose pins – Pull the trim and check the connector to the ON/OFF light. Make sure there’s no green corrosion or loose contacts.

      3. Grounds – Bad grounding to the airbag system can throw odd codes like this. Make sure body grounds near the dash and seat are clean and tight.

      If all checks out and the code keeps coming back, that indicator light module may need to be replaced. Just be careful working around airbag systems—disconnect the battery for at least 5–10 minutes before unplugging anything.

      Reply to Comment