B1891 Mercury 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 Mercury 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.
Code B1891 Mercury Description
What are the Possible Causes of the DTC B1891 Mercury?
- 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 Mercury?
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 Mercury 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.
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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.
Frequently Asked Questions about B1891 Mercury Code
1. What are the common symptoms of OBDII code B1891 in a Mercury vehicle?
The common symptoms of OBDII code B1891 in a Mercury vehicle may include the airbag warning light staying illuminated on the dashboard and the chime alerting for a prolonged period.
2. What does the OBDII code B1891 Mercury indicate?
The OBDII code B1891 for a Mercury indicates a circuit short to the battery in the airbag tone warning indicator system.
3. What are the possible causes of OBDII code B1891 in a Mercury?
The possible causes of OBDII code B1891 in a Mercury include a short circuit in the wiring, a faulty airbag tone warning indicator module, or a malfunctioning airbag control module.
4. How can I diagnose the OBDII code B1891 in my Mercury?
Diagnosing OBDII code B1891 in a Mercury typically involves using a diagnostic scanner to retrieve the code, inspecting the wiring for any visible damage, and testing the airbag tone warning indicator system components for proper functionality.
5. Is it safe to drive my Mercury with OBDII code B1891 active?
It is not recommended to drive your Mercury with OBDII code B1891 active, as it indicates a potential issue with the airbag tone warning indicator system, which is a crucial safety feature in the vehicle.
6. Can I repair OBDII code B1891 in my Mercury on my own?
Repairing OBDII code B1891 in a Mercury may require specialized tools and expertise, so it is recommended to consult a professional mechanic or dealership for proper diagnosis and repair.
7. How much does it cost to fix OBDII code B1891 in a Mercury?
The cost of fixing OBDII code B1891 in a Mercury can vary depending on the underlying cause of the issue, the extent of the repair needed, and the labor rates of the service provider.
8. Will resetting the OBDII code B1891 in my Mercury make the issue go away?
Resetting the OBDII code B1891 in a Mercury may temporarily clear the code, but it will not fix the underlying problem causing the circuit short to the battery in the airbag tone warning indicator system.
9. Can OBDII code B1891 in a Mercury affect the functionality of the airbags?
Yes, OBDII code B1891 in a Mercury can affect the functionality of the airbags, as it indicates a potential issue with the airbag tone warning indicator system, which is interconnected with the airbag system.
10. How long does it take to repair OBDII code B1891 in a Mercury?
The time it takes to repair OBDII code B1891 in a Mercury can vary depending on the specific cause of the issue, the availability of replacement parts, and the expertise of the mechanic performing the repair.
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