AutoCodes – Lincoln – B1509 Lincoln

B1509 Lincoln Code - Flash To Pass Switch Circuit Short To Battery

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: B1509 Lincoln indicates Flash To Pass Switch Circuit Short To Battery.
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 740

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 B1509 Lincoln 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 B1509 Lincoln - Flash To Pass Switch Circuit Short To Battery - AutoCodes.com — B1509 Lincoln Code - Flash To Pass Switch Circuit Short To Battery

What does this mean?

What are the Possible Causes of the DTC B1509 Lincoln?

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 B1509 Lincoln?

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 B1509 Lincoln 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.

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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 B1509 Lincoln Code

1. What are the common symptoms of OBDII code B1509 in a Lincoln, indicating a Flash To Pass Switch Circuit Short To Battery issue?

The common symptoms include the inability to use the flash to pass feature, malfunctioning high beams, and potential illumination of the check engine light.

2. What could cause the Flash To Pass Switch Circuit Short To Battery error code B1509 in a Lincoln?

Possible causes include a short circuit in the flash to pass switch wiring, a faulty flash to pass switch, or a wiring issue in the high beam circuit.

3. How can I diagnose the Flash To Pass Switch Circuit Short To Battery problem in my Lincoln?

To diagnose the issue, you can start by inspecting the flash to pass switch and its wiring for any visible damage. Using a multimeter to test for continuity and shorts in the circuit can help pinpoint the problem.

4. Is it safe to continue driving my Lincoln with the OBDII code B1509 related to the Flash To Pass Switch Circuit Short To Battery?

While the vehicle should still be drivable, it is recommended to address the issue promptly to ensure proper functioning of the high beam system and overall safety while driving at night.

5. Are there any simple repairs I can attempt myself to fix the Flash To Pass Switch Circuit Short To Battery issue in my Lincoln?

If you have experience with automotive electrical systems, you may be able to repair the problem by replacing the flash to pass switch or repairing any damaged wiring. However, if you're unsure, it's best to consult a professional mechanic.

6. Can a faulty flash to pass switch cause other electrical issues in my Lincoln besides triggering the B1509 code?

Yes, a faulty flash to pass switch can potentially cause issues with the high beam headlights, affecting visibility at night and overall safety. It's important to address the problem promptly.

7. How much can I expect to pay for professional repairs related to the OBDII code B1509 Flash To Pass Switch Circuit Short To Battery in my Lincoln?

The cost of repairs can vary depending on the exact cause of the issue and the labor rates in your area. It's advisable to obtain quotes from reputable mechanics or dealerships for an accurate estimate.

8. Will resetting the OBDII code B1509 in my Lincoln make the issue go away permanently?

Resetting the code may temporarily turn off the check engine light, but if the underlying problem with the Flash To Pass Switch Circuit Short To Battery is not addressed, the code is likely to reappear.

9. How can I prevent OBDII code B1509 related to the Flash To Pass Switch Circuit Short To Battery from occurring again in the future?

Regularly inspecting the flash to pass switch and related wiring for any signs of damage, and addressing issues promptly can help prevent the recurrence of the B1509 code in your Lincoln.

10. Is the OBDII code B1509 Flash To Pass Switch Circuit Short To Battery a common issue in Lincoln vehicles?

While not extremely common, issues with the flash to pass switch circuit can occur in Lincoln vehicles, leading to the triggering of the B1509 code. Regular maintenance and timely repairs can help mitigate such problems.