Flash-to-Pass Switch Circuit Failure (Ford/Lincoln); Open in Turn Signal Circuit, detected by the combination meter (Toyota/Lexus); External Air Temperature Open or Short Circuit (Subaru)
The B1507 code means the vehicle's onboard diagnostic system has detected: Flash-to-Pass Switch Circuit Failure (Ford/Lincoln); Open in Turn Signal Circuit, detected by the combination meter (Toyota/Lexus); External Air Temperature Open or Short Circuit (Subaru). This is a moderate 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. B1507 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.
Affiliate links — we earn a commission at no extra cost to you.
Common Symptoms
- 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
Probable Causes (Ranked by Likelihood)
- 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
Frequently Asked Questions
Does B1507 mean the same thing on every vehicle?
No. B1507 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 B1507 most likely indicate?
Flash-to-Pass Switch Circuit Failure (Ford/Lincoln); Open in Turn Signal Circuit, detected by the combination meter (Toyota/Lexus); External Air Temperature Open or Short Circuit (Subaru). Treat this as a general guide and verify the specifics for your vehicle.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Confirm your exact make, model, and year first — B1507 is manufacturer-specific and can mean different things across brands.
-
Read B1507 with an enhanced/make-specific scan tool and check your manufacturer's official service information for the precise definition and procedure.
-
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 factory service manual mirrors (Tacoma 2015-2018, C-HR)"Open in Turn Signal Circuit (B1507, B1508)"
- troublecodes.net
- superdutypsd.comFord body B-code list
Commonly Affected Vehicles
- 2015-2023 Chevrolet Silverado
- 2016-2023 Ford F-150
- 2014-2022 Ram 1500
- 2017-2023 Toyota Tacoma
Related Codes
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.