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AutoCodes – Toyota – B1660 Toyota

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

Quick Answer

The Passenger Airbag ON / OFF Indicator Circuit consists of the Center Airbag Sensor Assembly and the Passenger Airbag ON / OFF Indicator. Common causes include Faulty Passenger Airbag ON / OFF Indicator Light, Passenger Airbag ON / OFF Indicator Light harness is open or shorted, Passenger Airbag ON / OFF Indicator Light 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
B1660 Toyota indicates Passenger Airbag ON / OFF Indicator Circuit Malfunction.
Common causes
Common causes include Faulty Passenger Airbag ON / OFF Indicator Light, Passenger Airbag ON / OFF Indicator Light harness is open or shorted, Passenger Airbag ON / OFF Indicator Light 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 36,819
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Oct 13, 2022
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Code B1660 Toyota Description

The Passenger Airbag ON / OFF Indicator Circuit consists of the Center Airbag Sensor Assembly and the Passenger Airbag ON / OFF Indicator. The Passenger Airbag ON / OFF Indicator indicates the operation condition of the instrument panel passenger airbag assembly and front seat airbag assembly RH and LH. The Diagnostic Trouble Code (DTC) B1660 when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.
OBDII Code B1660 Toyota - Passenger Airbag ON / OFF Indicator Circuit Malfunction - AutoCodes.com
B1660 Toyota Code - Passenger Airbag ON / OFF Indicator Circuit Malfunction
What does this mean?

What are the Possible Causes of the DTC B1660 Toyota?

  • Faulty Passenger Airbag ON / OFF Indicator Light
  • Passenger Airbag ON / OFF Indicator Light harness is open or shorted
  • Passenger Airbag ON / OFF Indicator Light circuit poor electrical connection
  • Faulty Center Airbag Sensor Assembly

How to Fix the DTC B1660 Toyota?

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 B1660 Toyota 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 B1660 Toyota code?

Need more information on how to fix the B1660 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1660 Toyota code diagnosed by a professional: Find a repair shop in your area

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
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