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Engine-Codes – Generic – B1691

B1691 Code - Autolamp Delay Circuit Short To Battery

Quick Answer

The B1691 diagnostic trouble code (DTC) indicates an issue with the autolamp delay circuit shorting to the battery. Common causes include Short circuit in the autolamp delay circuit wiring, Faulty autolamp delay control module, Corrosion or damage to the electrical connectors related to the autolamp delay 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 indicates Autolamp Delay Circuit Short To Battery.
Common causes
Common causes include Short circuit in the autolamp delay circuit wiring, Faulty autolamp delay control module, Corrosion or damage to the electrical connectors related to the autolamp delay 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 Sep 07, 2024
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Code B1691 Description

The B1691 diagnostic trouble code (DTC) indicates an issue with the autolamp delay circuit shorting to the battery. In vehicles equipped with an automatic headlight system that includes an autolamp delay feature, this code signals a problem with the circuit that controls the delay between turning off the ignition and the headlights shutting off. When this circuit shorts to the battery, it can lead to various issues related to the autolamp delay function.

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

Common Causes of B1691

  1. Short circuit in the autolamp delay circuit wiring.
  2. Faulty autolamp delay control module.
  3. Corrosion or damage to the electrical connectors related to the autolamp delay circuit.
  4. Electrical issues such as a faulty battery or alternator affecting the autolamp delay system.

Symptoms of B1691

  1. Headlights staying on longer than usual after the ignition is turned off.
  2. Headlights flickering or behaving erratically.
  3. Battery draining quickly or going dead unexpectedly.
  4. Electrical system issues such as dimming lights or dashboard warning lights.

How to Fix B1691

  1. Begin by performing a thorough visual inspection of the autolamp delay circuit wiring, connectors, and control module to check for any visible damage or corrosion.
  2. Use a multimeter to test the continuity of the wiring and check for any shorts to the battery.
  3. If a short circuit is detected, repair or replace the affected wiring and connectors.
  4. Test the autolamp delay control module for proper functionality and replace if necessary.
  5. Clear the DTC codes from the vehicle's computer and test the autolamp delay system to ensure proper operation.

Cost to Fix B1691

The cost of repairing a B1691 code related to the autolamp delay circuit short to battery can vary depending on the extent of the damage and the specific components that need to be replaced. In general, the cost of parts for this repair may range from $50 to $200, while the labor involved could add another $100 to $300 to the total bill. Keep in mind that labor rates at auto repair shops can vary, so it's advisable to check with local establishments for a more accurate estimate.

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Code B1691 Information for Specific Makes

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 Code

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

The common symptoms include malfunctioning or inoperative autolamps, flickering lights, or the autolamps staying on continuously.

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

Possible causes may include a short to battery in the autolamp delay circuit, faulty wiring or connectors, a malfunctioning autolamp delay switch, or a defective autolamp control module.

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

Diagnosing this code typically involves inspecting the autolamp delay circuit wiring, connectors, and components for any visible damage or shorts. Using a multimeter to test for continuity and voltage can help pinpoint the issue.

4. What are some repair tips for fixing OBDII code B1691 Autolamp Delay Circuit Short To Battery?

Repair tips may include repairing or replacing damaged wiring, connectors, or components in the autolamp delay circuit, resetting the autolamp control module, or recalibrating the autolamp delay switch.

5. Can OBDII code B1691 Autolamp Delay Circuit Short To Battery be fixed at home, or do I need professional help?

Depending on your skill level and the extent of the issue, you may be able to fix this code at home by following diagnostic and repair procedures. However, if you are unsure or uncomfortable working with automotive electrical systems, it is recommended to seek professional help.

6. What tools may be needed to diagnose and repair OBDII code B1691 Autolamp Delay Circuit Short To Battery?

Tools that may be needed include a multimeter for testing continuity and voltage, wiring diagrams for your specific vehicle model, basic hand tools for accessing components, and potentially a diagnostic scanner to reset the fault code.

7. Is it safe to continue driving with OBDII code B1691 Autolamp Delay Circuit Short To Battery unresolved?

It is generally not recommended to continue driving with this code unresolved, as it can lead to safety issues such as non-functioning autolamps, reduced visibility, and potential electrical problems.

8. How do I reset the OBDII code B1691 Autolamp Delay Circuit Short To Battery after making repairs?

After making the necessary repairs, you can reset the fault code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes to clear the code from the system.

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

To prevent this issue, regularly inspecting and maintaining the autolamp system, checking for any signs of wiring damage or corrosion, and addressing any lighting issues promptly can help avoid encountering this fault code.

10. How common is OBDII code B1691 Autolamp Delay Circuit Short To Battery in vehicles?

This specific fault code may occur in vehicles equipped with autolamp delay circuits, particularly in older models or those with wiring issues. While not as common as some other OBDII codes, it is still encountered by automotive technicians.

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