AutoCodes – Ford – B1509 Ford

B1509 Ford 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 Ford 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 736

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

What does this mean?

What are the Possible Causes of the DTC B1509 Ford?

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 Ford?

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 Ford 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 Ford Code

1. What are the common symptoms of OBDII code B1509 Ford (Flash To Pass Switch Circuit Short To Battery)?

- The common symptoms include the flash-to-pass switch not working, the high beams not engaging when the switch is activated, and possibly a warning light on the dashboard.

2. What are the possible causes of the B1509 Ford trouble code?

- The code B1509 typically indicates a short to battery in the flash-to-pass switch circuit. Possible causes include damaged wiring, a faulty flash-to-pass switch, or a short circuit in the electrical system.

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

- To diagnose the issue, you can start by checking the wiring and connections related to the flash-to-pass switch. Use a multimeter to test for shorts in the circuit and inspect the switch for any visible damage.

4. Can I repair the B1509 Ford code myself?

- Depending on your level of automotive knowledge, you may be able to repair the issue yourself by identifying and fixing the short to battery in the flash-to-pass switch circuit. However, if you are unsure, it's recommended to seek professional help.

5. Is it safe to continue driving with the B1509 trouble code present?

- While the B1509 code may not affect the overall drivability of the vehicle, it's important to address the underlying issue promptly to ensure the proper functioning of the flash-to-pass switch and high beams.

6. How much does it typically cost to repair the Flash To Pass Switch Circuit Short To Battery problem?

- The cost of repairing the B1509 Ford code can vary depending on the exact cause of the issue and whether you choose to do the repairs yourself or take your vehicle to a mechanic. Costs may include parts and labor.

7. Are there any temporary fixes for the B1509 trouble code?

- Temporary fixes for the B1509 code may include checking and securing any loose connections related to the flash-to-pass switch or temporarily bypassing the circuit to restore functionality. However, these are not permanent solutions.

8. Will resetting the OBDII system clear the B1509 Ford code?

- Resetting the OBDII system may temporarily clear the B1509 code, but if the underlying issue with the flash-to-pass switch circuit remains unresolved, the code is likely to reappear after driving cycles.

9. Can extreme weather conditions cause the B1509 trouble code to trigger?

- While extreme weather conditions may not directly cause the B1509 code, they can potentially exacerbate existing electrical issues in the flash-to-pass switch circuit, leading to the short to battery fault.

10. Is the B1509 Ford code specific to certain Ford vehicle models?

- The B1509 code related to the flash-to-pass switch circuit short to battery is specific to Ford vehicles and may appear in various models equipped with this feature, such as Ford trucks and SUVs.