B1937 Code - Air Bag Passenger Pressure Switch Circuit Open Fault
Quick Answer
The B1937 code indicates a fault in the airbag passenger pressure switch circuit, specifically that the circuit is open. Common causes include Faulty passenger pressure switch: The most common cause of this code is a malfunctioning passenger pressure switch, which may have failed due to wear and tear or electrical issues, Wiring issues: Damage to the wiring harness that connects the passenger pressure switch to the airbag control module can also trigger this fault code, Loose or corroded connections: Loose or corroded electrical connections can disrupt the flow of electricity between the switch and the control module, leading to an open circuit fault. 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
- B1937 indicates Air Bag Passenger Pressure Switch Circuit Open Fault.
- Common causes
- Common causes include Faulty passenger pressure switch: The most common cause of this code is a malfunctioning passenger pressure switch, which may have failed due to wear and tear or electrical issues, Wiring issues: Damage to the wiring harness that connects the passenger pressure switch to the airbag control module can also trigger this fault code, Loose or corroded connections: Loose or corroded electrical connections can disrupt the flow of electricity between the switch and the control module, leading to an open circuit fault.
- 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 B1937 Description
The B1937 code indicates a fault in the airbag passenger pressure switch circuit, specifically that the circuit is open. The airbag system in modern vehicles is designed to protect occupants in the event of a collision by deploying airbags to cushion the impact. The passenger pressure switch is a crucial part of this system, as it helps to determine whether or not the passenger seat is occupied and adjusts the airbag deployment accordingly.
Common Causes of B1937
- Faulty passenger pressure switch: The most common cause of this code is a malfunctioning passenger pressure switch, which may have failed due to wear and tear or electrical issues.
- Wiring issues: Damage to the wiring harness that connects the passenger pressure switch to the airbag control module can also trigger this fault code.
- Loose or corroded connections: Loose or corroded electrical connections can disrupt the flow of electricity between the switch and the control module, leading to an open circuit fault.
- Faulty airbag control module: In rare cases, a malfunction in the airbag control module itself could be causing the circuit to remain open.
Symptoms of B1937
- Airbag warning light on the dashboard: One of the most common symptoms of this issue is the illumination of the airbag warning light on the dashboard. This serves as an indication that there is a problem with the airbag system.
- Inability to disable passenger airbag: If the passenger pressure switch circuit is open, the airbag system may not be able to detect whether there is a passenger in the seat or not, leading to the inability to disable the passenger airbag when necessary.
- Faulty airbag deployment: In the event of a collision, the airbags may not deploy as intended or may deploy with incorrect force, potentially causing more harm than good.
- Loss of communication with airbag system: The vehicle may also lose communication with the airbag system, leading to further complications in diagnosing and repairing the issue.
How to Fix B1937
- Diagnose the issue: The first step in repairing this problem is to diagnose the specific cause of the open circuit fault. This may involve using a diagnostic scanner to retrieve the trouble codes and perform further testing to pinpoint the exact issue.
- Inspect wiring and connections: Check the wiring harness for any signs of damage, such as fraying or breaks, and inspect all electrical connections for corrosion or looseness.
- Test the passenger pressure switch: Test the functionality of the passenger pressure switch to determine if it is working correctly. If it is faulty, it will need to be replaced.
- Replace faulty components: Depending on the cause of the issue, you may need to replace the passenger pressure switch, repair damaged wiring, or replace the airbag control module.
- Clear trouble codes: Once the repairs have been completed, clear the trouble codes from the system and test the airbag system to ensure that the issue has been resolved.
Cost to Fix B1937
The cost of repairing a B1937 code can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, replacing a faulty passenger pressure switch or repairing damaged wiring may cost between $200 to $500, including parts and labor. If the airbag control module needs to be replaced, the cost could increase to $500 to $1000 or more. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to get a detailed estimate from a professional technician.
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Code B1937 Information for Specific Makes
- B1937 Ford — Air Bag Passenger Pressure Switch Circuit Open Fault
- B1937 Lincoln — Air Bag Passenger Pressure Switch Circuit Open Fault
- B1937 Mercury — Air Bag Passenger Pressure Switch Circuit Open Fault
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 B1937 Code
1. What are common symptoms of OBDII code B1937 (Air Bag Passenger Pressure Switch Circuit Open Fault)?
- Common symptoms include the airbag warning light staying illuminated on the dashboard and possible non-deployment of the passenger airbag during a collision.
2. What can cause the OBDII code B1937 to appear?
- The code B1937 may be triggered by a faulty passenger pressure switch, damaged wiring in the circuit, or a loose connection.
3. How serious is the Air Bag Passenger Pressure Switch Circuit Open Fault (B1937) code?
- This code relates to the passenger airbag system, so it is crucial to address it promptly to ensure the airbag functions correctly in case of an accident.
4. Can I continue driving with the B1937 code present?
- It is not recommended to continue driving with the B1937 code active, as it indicates a potential issue with the passenger airbag system's functionality.
5. How can I diagnose and repair the Air Bag Passenger Pressure Switch Circuit Open Fault (B1937) code?
- Diagnosis involves checking the passenger pressure switch, inspecting the circuit for any damage, and testing the wiring and connections. Repair may involve replacing the faulty switch, repairing damaged wiring, or securing loose connections.
6. Is it possible to clear the B1937 code without fixing the underlying issue?
- Clearing the code without addressing the underlying problem will not resolve the issue, and the code is likely to reappear once the system detects the fault again.
7. Can a DIY enthusiast fix the B1937 code at home?
- DIY enthusiasts with the necessary tools and knowledge of airbag systems may be able to diagnose and repair the B1937 code. However, working with airbag systems can be complex and potentially hazardous, so caution is advised.
8. How much does it typically cost to repair the Air Bag Passenger Pressure Switch Circuit Open Fault (B1937) code?
- The cost of repairing the B1937 code can vary depending on the underlying issue, the extent of the damage, and whether professional assistance is required. Costs may include parts and labor fees.
9. Are there any preventive measures to avoid triggering the B1937 code?
- Regular maintenance checks, avoiding impacts to the passenger airbag area, and handling the vehicle with care can help prevent issues that may trigger the B1937 code.
10. How long does it usually take to repair the B1937 code?
- The repair time for the B1937 code can vary depending on the specific issue and the expertise of the technician. Simple repairs may take a few hours, while more complex issues could require more time.
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