B1863 Code - Short to Positive in Driver Side Knee Airbag Squib Circuit

Quick Answer

The diagnostic code B1863 indicates a short to positive in the driver side knee airbag squib circuit. Common causes include Wiring damage or short circuits in the airbag squib circuit, Corrosion or poor connections in the wiring harness, Faulty airbag control module. 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

B1863 indicates Short to Positive in Driver Side Knee Airbag Squib Circuit.

Common causes

Common causes include Wiring damage or short circuits in the airbag squib circuit, Corrosion or poor connections in the wiring harness, Faulty airbag control module.

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.

• Description
• Common Causes
• Symptoms
• How To Fix
• Cost to Fix
• FAQs
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Common Causes of B1863

Symptoms of B1863

How to Fix B1863

Cost to Fix B1863

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Code B1863 Information for Specific Makes

• B1863 Chrysler — Window Position Sensor Power Supply Low
• B1863 Dodge — Window Position Sensor Power Supply Low
• B1863 Jeep — Window Position Sensor Power Supply Low
• B1863 Lexus — Short to Positive in Driver Side Knee Airbag Squib Circuit
• B1863 RAM — Window Position Sensor Power Supply Low
• B1863 Scion — Short to Positive in Driver Side Knee Airbag Squib Circuit
• B1863 Toyota — Short to Positive in Driver Side Knee Airbag Squib Circuit

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 B1863 Code

What does the OBDII code B1863 mean?

The OBDII code B1863 indicates a "Short to Positive in Driver Side Knee Airbag Squib Circuit," which means there is an electrical issue in the circuit that controls the driver side knee airbag.

What are the symptoms of a B1863 code?

Common symptoms include the airbag warning light being illuminated on the dashboard and, in some cases, the airbag system may become disabled.

What can cause the B1863 code to trigger?

The B1863 code can be triggered by a short circuit in the knee airbag squib circuit, damaged wiring, a faulty airbag module, or a defective airbag itself.

Is it safe to drive with a B1863 code?

While it may be safe to drive, the airbag system may not deploy in the event of an accident, which poses a significant safety risk. It is advisable to have the issue diagnosed and repaired promptly.

How can I diagnose the B1863 code?

To diagnose the B1863 code, a mechanic should use an OBDII scanner to confirm the code and then inspect the wiring and connectors associated with the driver side knee airbag for damage or shorts.

What repairs are commonly needed for a B1863 code?

Repairs may include fixing or replacing damaged wiring or connectors, replacing the knee airbag, or replacing the airbag control module if it is found to be faulty.

Can I reset the B1863 code myself?

While you can reset the code using an OBDII scanner, it is crucial to resolve the underlying issue first, as the code will likely reappear if the problem is not fixed.

How much does it typically cost to repair a B1863 code?

Repair costs can vary widely based on the specific issue but may range from $100 to $1,000 or more, depending on whether wiring, connectors, or the airbag module needs to be replaced.

Will disconnecting the battery clear the B1863 code?

Disconnecting the battery may temporarily clear the code, but it will not fix the underlying issue, and the code is likely to return once the system is reconnected and the ignition is turned on.