Engine-Codes.com
Engine-Codes – Mercury – B1890 Mercury

B1890 Mercury Code - PAD Warning Lamp Circuit Short to Battery

Quick Answer

The B1890 diagnostic trouble code for Mercury vehicles indicates that there is a short to the battery in the PAD (Passenger Airbag Deactivation) warning lamp circuit. Common causes include Damaged wiring or connectors in the PAD warning lamp circuit, Faulty PAD warning lamp module, Malfunctioning passenger airbag deactivation switch. 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
B1890 Mercury indicates PAD Warning Lamp Circuit Short to Battery.
Common causes
Common causes include Damaged wiring or connectors in the PAD warning lamp circuit, Faulty PAD warning lamp module, Malfunctioning passenger airbag deactivation switch.
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 12, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code B1890 Mercury Description

The B1890 diagnostic trouble code for Mercury vehicles indicates that there is a short to the battery in the PAD (Passenger Airbag Deactivation) warning lamp circuit. The PAD warning lamp is a crucial safety feature in the vehicle that alerts the driver to the status of the passenger airbag system. When this circuit is shorted to the battery, it can lead to incorrect or no warning indications regarding the status of the passenger airbag, potentially compromising passenger safety in the event of a collision.

OBDII Code B1890 Mercury - PAD Warning Lamp Circuit Short to Battery
B1890 Mercury Code - PAD Warning Lamp Circuit Short to Battery

Common Causes of B1890 Mercury

  1. Damaged wiring or connectors in the PAD warning lamp circuit
  2. Faulty PAD warning lamp module
  3. Malfunctioning passenger airbag deactivation switch
  4. Short circuit in the PAD warning lamp circuit
  5. Electrical issues in the vehicle's wiring system

Symptoms of B1890 Mercury

  1. Illumination of the PAD warning lamp on the instrument cluster
  2. Inconsistent or erratic behavior of the PAD warning lamp
  3. Passenger airbag system malfunction indicator on the dashboard
  4. Passenger airbag system fails to activate or deactivate properly

How to Fix B1890 Mercury

  1. Begin by conducting a thorough visual inspection of the PAD warning lamp circuit for any visible signs of damage, such as frayed wiring or loose connectors.
  2. Use a multimeter to test the continuity of the wiring in the circuit and check for any short circuits.
  3. Inspect the PAD warning lamp module and the passenger airbag deactivation switch for any faults or malfunctions.
  4. Replace any damaged wiring, connectors, or faulty components identified during the inspection.
  5. Clear the diagnostic trouble code from the vehicle's system using a compatible scan tool and perform a test drive to ensure that the issue has been resolved.

Cost to Fix B1890 Mercury

The typical repair costs for addressing a B1890 code related to a PAD warning lamp circuit short to battery can range from $150 to $400, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary depending on factors such as location, vehicle make and model, and engine type. It is advisable to inquire about local rates for a more accurate estimate of the repair costs. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

Need more information about the B1890 Mercury code?

Need more information on how to fix the B1890 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1890 Mercury 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 B1890 Mercury Code

1. What does OBDII code B1890 for Mercury indicate?

The B1890 code specifically refers to a fault in the PAD (Passive Anti-Theft System) warning lamp circuit, indicating a short to battery.

2. What are the common symptoms of OBDII code B1890 in a Mercury vehicle?

Common symptoms include the PAD warning lamp staying illuminated constantly or flickering intermittently, even when the system is not armed.

3. What are the possible causes of the B1890 OBDII code in a Mercury car?

The B1890 code can be triggered by a short to battery in the PAD warning lamp circuit, which may be caused by damaged wiring or a faulty PAD warning lamp module.

4. How can I diagnose the B1890 OBDII code related to the PAD warning lamp circuit in my Mercury?

To diagnose the issue, you can start by visually inspecting the wiring connected to the PAD warning lamp and checking for any visible damage or loose connections.

5. Can I still drive my Mercury with the B1890 OBDII code present?

It is generally safe to drive the vehicle with the B1890 code, but it is recommended to address the issue promptly to ensure the proper functioning of the Passive Anti-Theft System.

6. What are the repair options for fixing the B1890 OBDII code in a Mercury due to a short to battery in the PAD warning lamp circuit?

Repair options may include repairing or replacing damaged wiring, replacing the PAD warning lamp module, or resetting the fault code after addressing the underlying issue.

7. Is it possible to reset the B1890 OBDII code in a Mercury without fixing the underlying problem?

While you can clear the fault code using an OBDII scanner, it is crucial to address the root cause of the issue to prevent the code from reoccurring.

8. Are there any DIY tips for troubleshooting the B1890 OBDII code related to the PAD warning lamp circuit in a Mercury?

DIY tips include checking fuses related to the Passive Anti-Theft System, inspecting wiring for any visible damage, and ensuring all connections are secure.

9. Can a faulty PAD warning lamp module cause the B1890 OBDII code in a Mercury?

Yes, a faulty PAD warning lamp module can indeed trigger the B1890 code due to a short to battery in the circuit, and replacing the module may resolve the issue.

10. How important is it to address the B1890 OBDII code indicating a short to battery in the PAD warning lamp circuit of a Mercury vehicle?

It is essential to address the B1890 code promptly to ensure the proper functioning of the Passive Anti-Theft System and maintain the vehicle's security features.

Discuss the causes and fixes for B1890 Mercury OBDII Code

Submit a New Comment

Code B1890 Mercury comments

No comments found for this page.