AutoCodes – Generic – B1510

B1510 Code - Flash To Pass Switch Circuit Short To Ground

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: B1510 indicates Flash To Pass Switch Circuit Short To Ground.
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 6,769

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 B1510 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 B1510 - Flash To Pass Switch Circuit Short To Ground - AutoCodes.com — B1510 Code - Flash To Pass Switch Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC B1510?

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 B1510?

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 B1510 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 B1510 code?

Need more information on how to fix the B1510 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1510 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1510 Ford — Flash To Pass Switch Circuit Short To Ground
B1510 Lincoln — Flash To Pass Switch Circuit Short To Ground
B1510 Mercury — Flash To Pass Switch Circuit Short To Ground

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 B1510 Code

1. What are the common symptoms of OBDII code B1510 - Flash To Pass Switch Circuit Short To Ground?

- The common symptoms include the inability to use the flash-to-pass feature on the vehicle, malfunctioning high beam headlights, or flickering of the high beam headlights.

2. What can cause OBDII code B1510 to trigger?

- This code is typically triggered by a short to ground in the flash-to-pass switch circuit, which can be caused by damaged wiring, a faulty switch, or a malfunctioning control module.

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

- Diagnosing this issue involves inspecting the flash-to-pass switch, checking the wiring harness for any visible damage, and using a multimeter to test for continuity and shorts in the circuit.

4. Can I repair OBDII code B1510 myself?

- Depending on your experience and access to tools, you may be able to repair this issue yourself by replacing the flash-to-pass switch, repairing damaged wiring, or addressing any underlying electrical faults.

5. Is it safe to continue driving with OBDII code B1510 active?

- While the code itself may not affect the drivability of the vehicle, it is important to address the underlying issue promptly to ensure proper operation of the flash-to-pass function and prevent potential electrical problems.

6. Can a faulty relay cause OBDII code B1510 to appear?

- A faulty relay could potentially cause the flash-to-pass switch circuit to short to ground, triggering OBDII code B1510. It is recommended to test and inspect the relay as part of the diagnostic process.

7. What are some tips for preventing OBDII code B1510 from recurring?

- To prevent the code from recurring, ensure proper installation of any replacement components, regularly inspect the wiring harness for damage, and avoid overloading the electrical system with aftermarket accessories.

8. Does resetting the OBDII system clear the B1510 code?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing the short to ground in the flash-to-pass circuit is not addressed, the code is likely to reappear.

9. Will fixing OBDII code B1510 require specialized tools or equipment?

- While basic tools like a multimeter and wiring diagram are helpful for diagnosis, specialized tools may be required depending on the exact cause of the circuit short to ground, such as a scan tool for advanced diagnostics.

10. Is OBDII code B1510 a common issue in specific vehicle makes or models?

- The occurrence of this code can vary across different vehicle makes and models, but it is generally more common in vehicles with complex lighting systems or those that frequently use the flash-to-pass feature.