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B1793 Lincoln Code - Autolamp Sensor Input Circuit Short To Ground

Quick Answer

The B1793 diagnostic trouble code for Lincoln vehicles refers to an issue with the Autolamp Sensor Input Circuit being shorted to ground. Common causes include Damaged wiring or connectors related to the Autolamp Sensor, A faulty Autolamp Sensor, Short circuit in the wiring harness. 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 Lincoln indicates Autolamp Sensor Input Circuit Short To Ground.
Common causes
Common causes include Damaged wiring or connectors related to the Autolamp Sensor, A faulty Autolamp Sensor, Short circuit in the wiring harness.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code B1793 Lincoln Description

The B1793 diagnostic trouble code for Lincoln vehicles refers to an issue with the Autolamp Sensor Input Circuit being shorted to ground. The Autolamp Sensor is responsible for automatically turning the headlights on and off based on the ambient light conditions. When this circuit is shorted to ground, it means that there is an unintended connection between the sensor input and the vehicle's ground, causing the system to malfunction.

OBDII Code B1793 Lincoln - Autolamp Sensor Input Circuit Short To Ground
B1793 Lincoln Code - Autolamp Sensor Input Circuit Short To Ground

Common Causes of B1793 Lincoln

  1. Damaged wiring or connectors related to the Autolamp Sensor.
  2. A faulty Autolamp Sensor.
  3. Short circuit in the wiring harness.
  4. Malfunctioning control module for the automatic headlight system.

Symptoms of B1793 Lincoln

  1. Constantly illuminated headlights, even in daylight conditions.
  2. Headlights flickering or flashing intermittently.
  3. Inability to manually control the headlights.
  4. Dashboard warning light related to exterior lighting system.

How to Fix B1793 Lincoln

  1. Begin by conducting a thorough visual inspection of the wiring and connectors associated with the Autolamp Sensor Input Circuit.
  2. Test the Autolamp Sensor for proper functionality using a multimeter or diagnostic tool.
  3. Check for any short circuits in the wiring harness by performing continuity tests.
  4. If the issue persists, replace the Autolamp Sensor or repair/replace any damaged wiring.
  5. Clear the diagnostic trouble code from the vehicle's system and test the automatic headlight function to ensure proper operation.

Cost to Fix B1793 Lincoln

The typical repair costs for addressing a B1793 Autolamp Sensor Input Circuit Short to Ground code can range from $150 to $300, including parts and labor. However, it's important to note that the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate.

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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 B1793 Lincoln Code

1. What does the OBDII code B1793 mean for a Lincoln?

The code B1793 indicates a problem with the Autolamp Sensor Input Circuit, specifically a short to ground.

2. What are the common symptoms of the B1793 code?

Symptoms may include non-functional automatic headlights, headlights staying on or off unexpectedly, or dashboard warning lights.

3. What causes the B1793 code to appear?

The code is typically caused by a shorted or damaged Autolamp sensor, faulty wiring, or a defective headlight control module.

4. Can I still drive my Lincoln with the B1793 code?

Yes, but automatic headlight functionality may be compromised, potentially affecting nighttime driving safety.

5. How do I diagnose the B1793 code?

Start by inspecting the Autolamp sensor and its wiring for damage or corrosion, and use a multimeter to check for a short to ground.

6. How do I fix the B1793 code?

Repairs may involve replacing the Autolamp sensor, repairing damaged wiring, or replacing the headlight control module if it’s faulty.

7. Where is the Autolamp sensor located in a Lincoln?

The Autolamp sensor is usually located near the dashboard, often on top where it can detect ambient light.

8. How much does it cost to repair the B1793 code?

Repair costs vary but may range from $50 to $200 for parts and labor, depending on the exact issue.

9. Can a blown fuse cause the B1793 code?

A blown fuse is unlikely to cause this specific code, but checking related fuses is still a good idea during diagnosis.

10. Do I need professional help to fix the B1793 code?

While basic wiring inspections can be done at home, repairs involving electrical systems or module replacement may require professional expertise.

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