B1793 Ford Code - Autolamp Sensor Input Circuit Short To Ground
Quick Answer
The Smart Junction Box (SJB) sends a voltage signal to the headlamp switch and the light sensor. Common causes include Faulty Light Sensor, Light Sensor harness is open or shorted, Light Sensor 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
- B1793 Ford indicates Autolamp Sensor Input Circuit Short To Ground.
- Common causes
- Common causes include Faulty Light Sensor, Light Sensor harness is open or shorted, Light Sensor 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.
Code B1793 Ford Description
When the headlamp switch is placed in the AUTOLAMPS ON position, the voltage signal is routed to ground. When the SJB detects the headlamp switch in the AUTOLAMPS ON position, the SJB monitors the light sensor input. The light sensor determines the amount of light based on the input received from the ambient lighting conditions. When the ambient level has reached a point (determined by the internal programming of the SJB ), the SJB provides voltage to the headlamps, parking and license plate lamps. The Diagnostic Trouble Code (DTC) sets when the SJB detects a short to ground from the light sensor input circuit.
What are the Possible Causes of the DTC B1793 Ford?
- Faulty Light Sensor
- Light Sensor harness is open or shorted
- Light Sensor circuit poor electrical connection
- Faulty Headlamp Switch
- Faulty Smart Junction Box (SJB)
How to Fix the DTC B1793 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 B1793 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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Frequently Asked Questions about B1793 Ford Code
1. What are common symptoms of OBDII code B1793 Ford (Autolamp Sensor Input Circuit Short To Ground)?
The common symptoms include malfunctioning automatic headlights, flickering or dimming of interior lights, and the inability to turn off the exterior lights.
2. What are possible causes of OBDII code B1793 Ford?
Possible causes include a short to ground in the autolamp sensor circuit, damaged wiring or connectors, a faulty autolamp sensor, or a malfunctioning body control module.
3. How can I diagnose OBDII code B1793 Ford?
Diagnosing this code involves inspecting the wiring and connectors in the autolamp sensor circuit, testing the autolamp sensor for proper functionality, and checking the body control module for any faults.
4. How do I repair OBDII code B1793 Ford?
To repair this code, you may need to repair or replace any damaged wiring or connectors in the autolamp sensor circuit, replace a faulty autolamp sensor, or reprogram the body control module if needed.
5. Can OBDII code B1793 Ford be cleared/reset without fixing the issue?
Clearing the code without addressing the underlying issue may temporarily turn off the warning light, but the problem will persist and the code is likely to return.
6. Is it safe to drive with OBDII code B1793 Ford?
It is generally safe to drive with this code, but you may experience issues with the automatic lighting system, which can impact visibility and safety, especially at night.
7. Can a DIYer fix OBDII code B1793 Ford?
Depending on your skill level and access to tools, a DIYer may be able to fix this code by following repair guides and using diagnostic equipment to identify and address the issue.
8. How much does it cost to repair OBDII code B1793 Ford at a mechanic or dealership?
The cost of repairing this code can vary depending on the root cause of the issue, but it may range from $100 to $300 for parts and labor at a mechanic or dealership.
9. Will OBDII code B1793 Ford cause my vehicle to fail an emissions test?
This specific code is related to the autolamp sensor circuit and is unlikely to cause your vehicle to fail an emissions test, but it should still be addressed to ensure proper functioning of the lighting system.
10. How often does OBDII code B1793 Ford occur in Ford vehicles?
While the frequency of occurrence may vary, OBDII code B1793 Ford related to the Autolamp Sensor Input Circuit Short To Ground is a relatively common issue in Ford vehicles equipped with automatic lighting systems.
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