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B1691 Lincoln Code - Autolamp Delay Circuit Short To Battery

Quick Answer

The B1691 diagnostic trouble code (DTC) is specific to Lincoln vehicles and indicates a malfunction within the autolamp delay circuit, which has shorted to the battery. Common causes include Short circuit in the wiring harness associated with the autolamp delay circuit, Faulty autolamp control module or relay, Corroded or damaged electrical connectors in the lighting circuit. 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
B1691 Lincoln indicates Autolamp Delay Circuit Short To Battery.
Common causes
Common causes include Short circuit in the wiring harness associated with the autolamp delay circuit, Faulty autolamp control module or relay, Corroded or damaged electrical connectors in the lighting circuit.
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 Oct 02, 2024
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Code B1691 Lincoln Description

The B1691 diagnostic trouble code (DTC) is specific to Lincoln vehicles and indicates a malfunction within the autolamp delay circuit, which has shorted to the battery. The autolamp system is designed to automatically turn on the vehicle's headlights in low-light conditions, enhancing visibility and safety. When this code is triggered, it suggests that there is an electrical fault within the circuit responsible for controlling the delay function of the autolamps, leading to a direct connection to the battery.

OBDII Code B1691 Lincoln - Autolamp Delay Circuit Short To Battery
B1691 Lincoln Code - Autolamp Delay Circuit Short To Battery

Common Causes of B1691 Lincoln

  1. Short circuit in the wiring harness associated with the autolamp delay circuit.
  2. Faulty autolamp control module or relay.
  3. Corroded or damaged electrical connectors in the lighting circuit.
  4. Water intrusion or moisture damage affecting electrical components.
  5. Improper installation or modification of the vehicle's lighting system.

Symptoms of B1691 Lincoln

  1. Headlights remain on continuously, even when the vehicle is turned off.
  2. Headlights fail to turn on automatically in low-light conditions.
  3. Battery drains quickly, leading to starting issues.
  4. Flickering or inconsistent operation of the headlights.
  5. Dashboard warning lights related to the lighting system may illuminate.

How to Fix B1691 Lincoln

  1. Visual Inspection: Begin by inspecting the wiring harness and connectors for any visible damage, corrosion, or signs of wear. Pay close attention to areas where wires may be pinched or exposed to moisture.
  2. Test the Autolamp Control Module: Use a multimeter to check the functionality of the autolamp control module. If it is not functioning correctly, it may need to be replaced.
  3. Repair or Replace Damaged Wiring: If any damaged wires or connectors are found, repair or replace them as necessary to restore proper electrical continuity.
  4. Check for Short Circuits: Conduct a thorough check of the circuit for any short circuits. This may involve tracing the wiring back to the battery and ensuring that there are no unintended connections.
  5. Clear the Code and Test Drive: After making repairs, clear the B1691 code using an OBD-II scanner and take the vehicle for a test drive to ensure that the autolamp system operates correctly and that the code does not reappear.

Cost to Fix B1691 Lincoln

The cost to repair a B1691 code can vary widely based on the specific issue identified during diagnosis. On average, repairs may range from $100 to $600. This estimate includes parts such as wiring, connectors, or a new autolamp control module, as well as labor costs. Labor rates typically range from $80 to $150 per hour, depending on the shop's location, the vehicle's make and model, and the complexity of the repair. In metropolitan areas or at dealerships, rates may be higher, while independent shops may offer lower rates. It is advisable to obtain quotes from local repair shops for a more precise estimate tailored to your specific situation.

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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 B1691 Lincoln Code

1. What are the common symptoms of OBDII code B1691 (Lincoln) Autolamp Delay Circuit Short To Battery?

- Common symptoms include the interior lights staying on or flickering, the autolamp delay feature not working properly, and potential draining of the vehicle's battery.

2. What are the possible causes of OBDII code B1691 (Lincoln) Autolamp Delay Circuit Short To Battery?

- The possible causes of this code can be a short circuit in the autolamp delay circuit wiring, a faulty autolamp delay relay, or a malfunctioning autolamp control module.

3. How can I diagnose OBDII code B1691 (Lincoln) Autolamp Delay Circuit Short To Battery?

- Diagnosis involves checking the wiring harness for any visible damage, testing the autolamp delay relay for proper functionality, and using a diagnostic scanner to pinpoint the exact source of the short circuit.

4. Can I continue driving my vehicle with OBDII code B1691 (Lincoln) Autolamp Delay Circuit Short To Battery?

- It is generally safe to continue driving the vehicle with this code, but it is recommended to address the issue promptly to prevent any potential electrical problems or battery drainage.

5. How can I repair OBDII code B1691 (Lincoln) Autolamp Delay Circuit Short To Battery?

- Repairing this code involves fixing the short circuit in the autolamp delay circuit wiring, replacing any damaged components like the autolamp delay relay or control module, and clearing the diagnostic trouble codes.

6. Is it possible to reset OBDII code B1691 (Lincoln) Autolamp Delay Circuit Short To Battery without repairs?

- While clearing the diagnostic trouble codes may temporarily reset the code, it is important to address the underlying issue causing the fault code to prevent it from reoccurring.

7. Can a DIY enthusiast fix OBDII code B1691 (Lincoln) Autolamp Delay Circuit Short To Battery?

- DIY enthusiasts with experience in automotive electrical systems may be able to diagnose and repair this code, but it is recommended to consult a professional if unsure about the process.

8. How much does it cost to repair OBDII code B1691 (Lincoln) Autolamp Delay Circuit Short To Battery at a repair shop?

- The cost of repairing this code at a repair shop can vary depending on the extent of the damage and the specific components that need to be replaced, but it typically ranges from $100 to $300.

9. Are there any preventive measures to avoid OBDII code B1691 (Lincoln) Autolamp Delay Circuit Short To Battery in the future?

- Regularly inspecting the vehicle's electrical system for any signs of wear or damage, avoiding overloading the autolamp delay circuit, and ensuring proper installation of aftermarket electrical components can help prevent this code from occurring.

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