Passenger Airbag ON/OFF Indicator Circuit Malfunction — the airbag ECU detects an open or short in the telltale circuit that tells the occupant whether the passenger airbag is suppressed (Toyota/Lexus/Scion, sub-code B1660/43); Seat Driver Front Up Circuit Open (Ford)
The B1660 code means the vehicle's onboard diagnostic system has detected: Passenger Airbag ON/OFF Indicator Circuit Malfunction — the airbag ECU detects an open or short in the telltale circuit that tells the occupant whether the passenger airbag is suppressed (Toyota/Lexus/Scion, sub-code B1660/43); Seat Driver Front Up Circuit Open (Ford). This is a serious severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- hard
- Estimated cost
- Varies — depends on the specific component this manufacturer-specific code points to on your vehicle. Diagnose before buying parts.
Manufacturer-specific code. B1660 is a manufacturer-specific DTC, so its exact definition can differ by make, model, and year. Use the meaning above as a general guide, and always confirm it against your vehicle manufacturer's official service information (or a make-specific scan tool) before diagnosing or replacing parts.
Basic scanners skip body codes entirely. BlueDriver reads airbag, HVAC, lighting, and BCM codes through your phone.
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What Are the Symptoms of B1660?
- Check Engine or a related warning light on
- Exact symptoms depend on the specific system this code covers for your make
- A make-specific scan reveals which subsystem and circuit is involved
What Causes B1660? (Most Likely First)
- A fault in the specific component or circuit this code monitors (the exact part varies by manufacturer) High
- Damaged wiring, a corroded connector, or a poor ground in that circuit Moderate
- A related sensor or control module reporting or causing the fault Moderate
Can I Still Drive with B1660?
Yes, but fix soon. B1660 is rated serious severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring the light.
Frequently Asked Questions
Does B1660 mean the same thing on every vehicle?
No. B1660 is a manufacturer-specific diagnostic trouble code, so its exact meaning varies by make, model, and year. Always confirm it against your vehicle manufacturer's service information before diagnosing or replacing parts.
What does B1660 most likely indicate?
Passenger Airbag ON/OFF Indicator Circuit Malfunction — the airbag ECU detects an open or short in the telltale circuit that tells the occupant whether the passenger airbag is suppressed (Toyota/Lexus/Scion, sub-code B1660/43); Seat Driver Front Up Circuit Open (Ford). Treat this as a general guide and verify the specifics for your vehicle.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose B1660?
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Confirm your exact make, model, and year first — B1660 is manufacturer-specific and can mean different things across brands.
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Read B1660 with an enhanced/make-specific scan tool and check your manufacturer's official service information for the precise definition and procedure.
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Inspect the wiring, connectors, and grounds for the indicated circuit before replacing any part.
Sources 3
This page is built from documented references. Verify against your own service info before repair work.
- toyota-club.netToyota SRS DTC list, "B1660/43 Passenger Airbag ON/OFF Indicator Circuit Malfunction"
- Toyota factory service manual mirrors (Tacoma, Venza, C-HR, FJ Cruiser, Matrix)
- troublecodes.net / superdutypsd.comFord seat-circuit meaning
Which Vehicles Commonly Get B1660?
- 2019-2023 Tesla Model 3
- 2020-2023 Tesla Model Y
- 2021-2023 Ford Mustang Mach-E
- 2022-2023 Rivian R1T
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