AutoCodes – Ford – B1891 Ford

B1891 Ford Code - Air Bag Tone Warning Indicator Circuit Short to Battery

Quick Answer

The connection between the Instrument Cluster Module and Restraints Control Module (RCM) is used to signal a chime if the primary air bag indicator is inoperative and another Supplemental Restraint System (SRS) fault exists. Common causes include Faulty Instrument Cluster Module, Instrument Cluster Module harness is open or shorted, Instrument Cluster Module 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: B1891 Ford indicates Air Bag Tone Warning Indicator Circuit Short to Battery.
Common causes: Common causes include Faulty Instrument Cluster Module, Instrument Cluster Module harness is open or shorted, Instrument Cluster Module 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.

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Code Popularity 3,032

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 Jul 12, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1891 Ford Description

The connection between the Instrument Cluster Module and Restraints Control Module (RCM) is used to signal a chime if the primary air bag indicator is inoperative and another Supplemental Restraint System (SRS) fault exists. The RCM monitors this connection to the Instrument Cluster Module. If the RCM detects a circuit failure on the connection to the cluster, it will store diagnostic trouble code (DTC) B1891 in memory and flash lamp on the air bag indicator.

OBDII Code B1891 Ford - Air Bag Tone Warning Indicator Circuit Short to Battery - AutoCodes.com — B1891 Ford Code - Air Bag Tone Warning Indicator Circuit Short to Battery

What does this mean?

What are the Possible Causes of the DTC B1891 Ford?

Faulty Instrument Cluster Module
Instrument Cluster Module harness is open or shorted
Instrument Cluster Module circuit poor electrical connection
Faulty Restraints Control Module (RCM)

How to Fix the DTC B1891 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 B1891 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.

Need more information about the B1891 Ford code?

Need more information on how to fix the B1891 Ford code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1891 Ford code diagnosed by a professional: Find a repair shop in your area

Precautions for SRS “AIR BAG” and “SEAT BELT PRE-TENSIONER” Service

Never probe the electrical connectors on air bag, side air curtain modules or seat belts.
Never disassemble or tamper with safety belt buckle/retractor pretensioners, adaptive load limiting retractors, safety belt inflators, or probe the electrical connectors.
Do not use electrical test equipment to check SRS circuits unless instructed to in this Service Manual.
Before servicing the SRS, turn ignition switch OFF, disconnect both battery cables and wait at least 3 minutes. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pre-tensioner to deploy. Therefore, do not work on any SRS connectors or wires until at least 3 minutes have passed.

Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

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 B1891 Ford Code

1. What are the common symptoms of OBDII code B1891 in a Ford vehicle?

The common symptoms of OBDII code B1891 in a Ford vehicle include the airbag warning light staying illuminated on the dashboard and possible issues with the airbag system.

2. What does the OBDII code B1891 Ford indicate?

OBDII code B1891 for Ford indicates a problem with the Air Bag Tone Warning Indicator Circuit being shorted to battery.

3. What are the possible causes of the Air Bag Tone Warning Indicator Circuit short to battery in a Ford vehicle?

Possible causes of the Air Bag Tone Warning Indicator Circuit short to battery in a Ford vehicle include damaged wiring, a faulty airbag control module, or a short circuit in the system.

4. How can I diagnose the Air Bag Tone Warning Indicator Circuit short to battery issue in my Ford vehicle?

To diagnose the issue, you may need to perform a thorough inspection of the wiring related to the airbag system, check the airbag control module for faults, and use a diagnostic scanner to read the trouble codes.

5. Is it safe to drive my Ford vehicle with the OBDII code B1891 present?

It is not recommended to drive your Ford vehicle with the OBDII code B1891 present, as it indicates a potential issue with the airbag system that could compromise your safety in the event of a collision.

6. Can I repair the Air Bag Tone Warning Indicator Circuit short to battery issue in my Ford vehicle myself?

Repairing the Air Bag Tone Warning Indicator Circuit short to battery issue in a Ford vehicle may require advanced knowledge and specialized tools. It is recommended to consult a professional mechanic for proper diagnosis and repair.

7. How much does it typically cost to repair the OBDII code B1891 in a Ford vehicle?

The cost of repairing OBDII code B1891 in a Ford vehicle can vary depending on the underlying cause of the issue, the extent of the damage, and the labor rates of the repair facility. It is advisable to obtain quotes from multiple mechanics for an accurate estimate.

8. Can resetting the OBDII system clear the B1891 code in a Ford vehicle?

Resetting the OBDII system may temporarily clear the B1891 code, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is essential to diagnose and repair the root cause of the problem.

9. Are there any safety precautions to take when working on the airbag system related to OBDII code B1891 in a Ford vehicle?

When working on the airbag system related to OBDII code B1891 in a Ford vehicle, it is crucial to disconnect the battery and wait for the system to fully discharge before beginning any repair work to prevent accidental deployment of the airbags.

10. How can I prevent OBDII code B1891 from occurring in my Ford vehicle?

To prevent OBDII code B1891 from occurring in your Ford vehicle, it is essential to perform regular maintenance checks on the airbag system, avoid any physical damage to the wiring, and address any warning lights promptly to ensure the proper functioning of the system.