B1939 Mercury Code - Air Bag Passenger Pressure Switch Circuit Short To Ground Fault
Quick Answer
The Restraints Control Module (RCM) monitors the Air Bag Passenger Pressure Switch. Common causes include Faulty Air Bag Passenger Pressure Switch, Air Bag Passenger Pressure Switch harness is open or shorted, Air Bag Passenger Pressure Switch 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
- B1939 Mercury indicates Air Bag Passenger Pressure Switch Circuit Short To Ground Fault.
- Common causes
- Common causes include Faulty Air Bag Passenger Pressure Switch, Air Bag Passenger Pressure Switch harness is open or shorted, Air Bag Passenger Pressure Switch 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 B1939 Mercury Description
What are the Possible Causes of the DTC B1939 Mercury?
- Faulty Air Bag Passenger Pressure Switch
- Air Bag Passenger Pressure Switch harness is open or shorted
- Air Bag Passenger Pressure Switch circuit poor electrical connection
- Faulty Restraint Control Module (RCM)
How to Fix the DTC B1939 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 B1939 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 B1939 Mercury Code
1. What are common symptoms of OBDII code B1939 in a Mercury related to the Air Bag Passenger Pressure Switch Circuit Short to Ground Fault?
- Common symptoms include the airbag warning light illuminating on the dashboard and potential non-deployment of the passenger side airbag in the event of a collision.
2. What causes the OBDII code B1939 in a Mercury for the Air Bag Passenger Pressure Switch Circuit Short to Ground Fault?
- The code B1939 typically occurs due to a short circuit between the passenger pressure switch circuit and ground, which can be caused by damaged wiring or a faulty pressure switch.
3. How can I diagnose the OBDII code B1939 in my Mercury related to the Air Bag Passenger Pressure Switch Circuit Short to Ground Fault?
- Diagnosis involves using an OBDII scanner to retrieve the specific code, inspecting the wiring and connectors for damage, and testing the pressure switch for proper functionality.
4. What are some repair tips for fixing the OBDII code B1939 in a Mercury for the Air Bag Passenger Pressure Switch Circuit Short to Ground Fault?
- Repair tips include repairing or replacing any damaged wiring, ensuring proper connection of the pressure switch, and clearing the fault code with an OBDII scanner after the repair is completed.
5. Is it safe to drive my Mercury with the OBDII code B1939 related to the Air Bag Passenger Pressure Switch Circuit Short to Ground Fault?
- It is not recommended to drive the vehicle with an unresolved airbag system fault, as it can compromise passenger safety in the event of an accident. Prompt repair is advised.
6. Can I reset the OBDII code B1939 in my Mercury related to the Air Bag Passenger Pressure Switch Circuit Short to Ground Fault without fixing the underlying issue?
- While you can clear the fault code with an OBDII scanner, it is important to address the root cause of the issue to ensure the airbag system functions properly and maintains passenger safety.
7. How much does it typically cost to repair the OBDII code B1939 in a Mercury for the Air Bag Passenger Pressure Switch Circuit Short to Ground Fault?
- Repair costs can vary depending on the extent of the damage and whether any components need to be replaced. It is advisable to consult a professional mechanic for an accurate estimate.
8. Can I fix the OBDII code B1939 in my Mercury related to the Air Bag Passenger Pressure Switch Circuit Short to Ground Fault myself?
- While some DIY enthusiasts may be able to address simple wiring issues, diagnosing and repairing airbag system faults can be complex and requires specialized knowledge. Consulting a professional is recommended.
9. Are there any recalls or technical service bulletins related to the OBDII code B1939 in a Mercury for the Air Bag Passenger Pressure Switch Circuit Short to Ground Fault?
- It is advisable to check with the manufacturer or a dealership to see if there are any recalls or technical service bulletins related to this specific OBDII code in your Mercury model.
10. How long does it typically take to repair the OBDII code B1939 in a Mercury for the Air Bag Passenger Pressure Switch Circuit Short to Ground Fault?
- The repair time can vary depending on the extent of the issue and the availability of parts. Simple repairs may take a few hours, while more complex issues could require a day or more.
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