AutoCodes – Generic – B1691

B1691 Code - Autolamp Delay Circuit Short To Battery

Quick Answer

The Body Control Module (BCM) monitors the Autolamp Delay Circuit. Common causes include Faulty Autolamp Delay Circuit, Faulty Body Control Module (BCM). 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 Faulty Autolamp Delay Circuit, Faulty Body Control Module (BCM).
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 5,936

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 Jun 12, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1691 Description

The Body Control Module (BCM) monitors the Autolamp Delay Circuit. The BCM sets the OBDII code when the Autolamp Delay Circuit is not to factory specifications.

OBDII Code B1691 - Autolamp Delay Circuit Short To Battery - AutoCodes.com — B1691 Code - Autolamp Delay Circuit Short To Battery

What does this mean?

What are the Possible Causes of the DTC B1691?

Faulty Autolamp Delay Circuit
Faulty Body Control Module (BCM)

How to Fix the DTC B1691?

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 B1691 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.

Need more information about the B1691 code?

Need more information on how to fix the B1691 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1691 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1691 Ford — Autolamp Delay Circuit Short To Battery
B1691 Lincoln — Autolamp Delay Circuit Short To Battery
B1691 Mercury — Autolamp Delay Circuit Short To Battery

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.