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Engine-Codes – Mercury – B1999 Mercury

B1999 Mercury Code - Passenger Side Side Mount Airbag Low Resistance On Squib

Quick Answer

The B1999 diagnostic trouble code (DTC) for Mercury vehicles indicates that there is low resistance on the passenger side side mount airbag squib. Common causes include Faulty passenger side side mount airbag squib, Damaged wiring or connectors in the airbag system, Loose connection in the airbag system. 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
B1999 Mercury indicates Passenger Side Side Mount Airbag Low Resistance On Squib.
Common causes
Common causes include Faulty passenger side side mount airbag squib, Damaged wiring or connectors in the airbag system, Loose connection in the airbag system.
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 14, 2024
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Code B1999 Mercury Description

The B1999 diagnostic trouble code (DTC) for Mercury vehicles indicates that there is low resistance on the passenger side side mount airbag squib. The squib is a component in the airbag system that is responsible for deploying the airbag in the event of a collision. Low resistance on the squib can prevent the airbag from deploying properly, which can compromise the safety of the vehicle occupants in the event of an accident.

OBDII Code B1999 Mercury - Passenger Side Side Mount Airbag Low Resistance On Squib
B1999 Mercury Code - Passenger Side Side Mount Airbag Low Resistance On Squib

Common Causes of B1999 Mercury

  1. Faulty passenger side side mount airbag squib.
  2. Damaged wiring or connectors in the airbag system.
  3. Loose connection in the airbag system.
  4. Malfunctioning airbag control module.
  5. Impact or collision that damaged the airbag system components.

Symptoms of B1999 Mercury

  1. Airbag warning light illuminated on the dashboard.
  2. Inability to turn off the airbag warning light even after resetting it.
  3. Intermittent or non-deployment of the passenger side airbag.
  4. Diagnostic trouble code B1999 stored in the vehicle's computer system.

How to Fix B1999 Mercury

  1. Diagnose the issue by using a scan tool to retrieve the B1999 code and inspecting the passenger side airbag system for any visible damage.
  2. Test the passenger side side mount airbag squib for proper resistance using a multimeter to determine if it is faulty.
  3. Check the wiring and connectors in the airbag system for any damage or loose connections and repair or replace as necessary.
  4. If the airbag control module is suspected to be the issue, it may need to be replaced or reprogrammed.
  5. Clear the B1999 code from the vehicle's computer system and test the airbag system to ensure proper deployment.

Cost to Fix B1999 Mercury

The cost of repairing a B1999 code for a Mercury vehicle can vary depending on the specific cause of the issue. On average, the repair costs for this type of airbag system problem can range from $200 to $800, including parts and labor. However, it's important to note that labor rates at auto repair shops can vary widely, typically ranging from $80 to $150 per hour. Additionally, the cost of parts and the complexity of the repair can also impact the overall cost. It is recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on your vehicle's make and model.

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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.

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 B1999 Mercury Code

1. What does OBDII code B1999 mean on a Mercury?

Code B1999 indicates a "Passenger Side Side Mount Airbag Low Resistance on Squib," meaning there’s an issue with the airbag electrical circuit on the passenger side.

2. What are the common symptoms of code B1999 in a Mercury?

Symptoms include an illuminated airbag warning light on the dashboard and the potential for the passenger side airbag not deploying during a collision.

3. What causes code B1999 on a Mercury vehicle?

Common causes include damaged wiring, corroded connectors, a faulty airbag module, or a malfunctioning airbag squib.

4. Is it safe to drive with code B1999 active?

It is not recommended to drive with this code active, as the passenger side airbag may not function properly in an accident, compromising safety.

5. How do you diagnose code B1999 on a Mercury?

Diagnosis involves using an OBDII scanner to confirm the code, visually inspecting wiring and connectors, and testing resistance in the airbag circuit.

6. Can a loose connection cause code B1999?

Yes, a loose or corroded connector in the airbag circuit can create low resistance and trigger the B1999 code.

7. How do you fix code B1999 on a Mercury?

Repairs may include cleaning or replacing corroded connectors, repairing damaged wiring, or replacing the passenger side airbag or module.

8. What tools are needed to repair code B1999?

You’ll need an OBDII scanner, a multimeter to test resistance, and potentially airbag system-specific tools for proper repairs.

9. Will disconnecting the battery reset code B1999?

Disconnecting the battery may temporarily clear the code, but the underlying issue must be fixed to prevent the code from returning.

10. How much does it cost to repair code B1999 on a Mercury?

Repair costs vary depending on the issue but can range from $50 for simple wiring fixes to over $1,000 if the airbag module or squib needs replacement.

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