AutoCodes – Generic – B1507

B1507 Code - Flash To Pass Switch Circuit Failure

Quick Answer

The Smart Junction Box (SJB) sends reference signals to the headlamp switch through circuits. Common causes include Faulty Headlamp Switch, Headlamp Switch harness is open or shorted, Headlamp Switch 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: B1507 indicates Flash To Pass Switch Circuit Failure.
Common causes: Common causes include Faulty Headlamp Switch, Headlamp Switch harness is open or shorted, Headlamp Switch 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 19,485

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 Apr 29, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1507 Description

The Smart Junction Box (SJB) sends reference signals to the headlamp switch through circuits. When the headlamp switch is placed in the HEADLAMPS ON position, the voltage signal is routed to ground through the circuit. If the SJB detects a fault with the headlamp switch inputs, the SJB turns the exterior lamps on by default. When the SJB detects the headlamp switch in the HEADLAMPS ON position and the multifunction switch in the LOW BEAM position, the SJB sends voltage through circuits to the low beam headlamps. When the SJB detects the headlamp switch in the HEADLAMPS ON position and the multifunction switch in the HIGH BEAM position, the SJB sends voltage through circuits to the high beam headlamps. The SJB sends a reference signal to the multifunction switch through circuits CLF27 (GN/BN) and CLF17 (WH/OG). When the multifunction switch is placed in the FLASH-TO-PASS or HIGH BEAM position, the voltage signal is routed to ground. When the SJB detects a request for the flash-to-pass, the SJB sends voltage to the high beam headlamps. The OBDII codes when the SJB detects a short to ground from the flash-to-pass input circuit.

OBDII Code B1507 - Flash To Pass Switch Circuit Failure - AutoCodes.com — B1507 Code - Flash To Pass Switch Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B1507?

Faulty Headlamp Switch
Headlamp Switch harness is open or shorted
Headlamp Switch circuit poor electrical connection
Faulty Smart Junction Box (SJB)

How to Fix the DTC B1507?

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 B1507 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 B1507 code?

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Get the B1507 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1507 Buick — High Voltage On Control Circuit
B1507 Cadillac — High Voltage On Control Circuit
B1507 Chevrolet — High Voltage On Control Circuit
B1507 Ford — Flash To Pass Switch Circuit Failure
B1507 GMC — High Voltage On Control Circuit
B1507 Lexus — Open In Turn Signal Circuit
B1507 Lincoln — Flash To Pass Switch Circuit Failure
B1507 Mercury — Flash To Pass Switch Circuit Failure
B1507 Subaru — External Air Temperature Open/Short-Circuit Detection
B1507 Toyota — Open In Turn Signal Circuit

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 B1507 Code

1. What are the common symptoms of OBDII code B1507 (Flash To Pass Switch Circuit Failure)?

- Common symptoms include the inability to use the flash-to-pass function, malfunctioning high beam headlights, or the high beam headlights staying on continuously.

2. What are the possible causes of OBDII code B1507?

- Possible causes include a faulty flash-to-pass switch, issues with the wiring or connectors in the flash-to-pass circuit, or a malfunction in the high beam headlight system.

3. How can I diagnose the Flash To Pass Switch Circuit Failure issue?

- You can diagnose this issue by checking the flash-to-pass switch for proper operation, inspecting the wiring and connectors for any damage or corrosion, and testing the high beam headlights for functionality.

4. Can I repair OBDII code B1507 on my own?

- Depending on your level of experience and access to tools, you may be able to repair this issue on your own by replacing the flash-to-pass switch, repairing any damaged wiring or connectors, or addressing the underlying cause of the circuit failure.

5. Are there any common mistakes to avoid when dealing with code B1507?

- One common mistake is overlooking simple issues like a faulty switch or loose connection. It's important to thoroughly inspect all components related to the flash-to-pass circuit before assuming a more complex problem.

6. Can a Flash To Pass Switch Circuit Failure lead to other electrical issues in the vehicle?

- Yes, if left unresolved, a Flash To Pass Switch Circuit Failure can potentially lead to other electrical issues, such as malfunctioning high beam headlights or problems with the vehicle's lighting system.

7. Is it safe to continue driving with OBDII code B1507 present?

- While you may still be able to drive with this code present, it's recommended to address the issue promptly to ensure proper operation of your vehicle's lighting system and avoid potential safety hazards on the road.

8. How do I reset OBDII code B1507 after making repairs?

- After making necessary repairs to address the Flash To Pass Switch Circuit Failure, you can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes to clear the error code.

9. Should I seek professional help to repair OBDII code B1507?

- If you are unsure about diagnosing or repairing the issue yourself, it's advisable to seek professional help from a qualified mechanic or automotive technician to ensure the problem is properly resolved.

10. Can weather conditions or environmental factors contribute to OBDII code B1507?

- Yes, extreme weather conditions or exposure to moisture can potentially cause corrosion in the wiring or connectors related to the flash-to-pass switch circuit, leading to a Flash To Pass Switch Circuit Failure.