AutoCodes – Generic – B1B18

B1B18 Code - Left Side Curtain Squib 1 Circuit Low

Quick Answer

When powered, the Occupant Restraint Controller (ORC) sends a test current to the squibs to verify the integrity of the squib and wiring. Common causes include Faulty Left Side Curtain Squib 1, Left Side Curtain Squib 1 harness is open or shorted, Left Side Curtain Squib 1 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: B1B18 indicates Left Side Curtain Squib 1 Circuit Low.
Common causes: Common causes include Faulty Left Side Curtain Squib 1, Left Side Curtain Squib 1 harness is open or shorted, Left Side Curtain Squib 1 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.

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Code Popularity 1,523

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 15, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1B18 Description

When powered, the Occupant Restraint Controller (ORC) sends a test current to the squibs to verify the integrity of the squib and wiring. These circuits are maintained in a floating configuration at the module (connected to neither power nor ground) as protection against inadvertent deployment. The use of the Supplemental Restraint System (SRS) Load Tool Adapter Tool provides a test point as well as a method for opening the shorting bar connections within the harness connector. The ORC sends out a 40 mA diagnostic current on each squib voltage supply circuit at power up and every 500 ms thereafter while the ignition is on.

OBDII Code B1B18 - Left Side Curtain Squib 1 Circuit Low - AutoCodes.com — B1B18 Code - Left Side Curtain Squib 1 Circuit Low

What does this mean?

What are the Possible Causes of the DTC B1B18?

Faulty Left Side Curtain Squib 1
Left Side Curtain Squib 1 harness is open or shorted
Left Side Curtain Squib 1 circuit poor electrical connection
Faulty Left Side Curtain Airbag
Faulty Occupant Restraint Controller (ORC)

How to Fix the DTC B1B18?

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 B1B18 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.

Need more information about the B1B18 code?

Need more information on how to fix the B1B18 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1B18 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1B18 Chrysler — Left Side Curtain Squib 1 Circuit Low
B1B18 Dodge — Left Side Curtain Squib 1 Circuit Low
B1B18 Jeep — Left Side Curtain Squib 1 Circuit Low
B1B18 Mitsubishi — Left Side Curtain Squib 1 Circuit Low
B1B18 RAM — Left Side Curtain Squib 1 Circuit Low

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 B1B18 Code

1. What does the OBDII code B1B18 mean?

Code B1B18 indicates a problem with the Left Side Curtain Squib 1 Circuit, specifically a low voltage or short-to-ground condition.

2. What are the common symptoms of code B1B18?

Symptoms include the airbag warning light illuminating, the airbags potentially being disabled, and no noticeable performance issues with the vehicle.

3. What causes the B1B18 code to appear?

Common causes include damaged wiring, corroded or loose connectors, a faulty side curtain airbag, or a malfunctioning airbag control module.

4. Can I drive with a B1B18 code active?

While the vehicle may still drive normally, it is unsafe because the airbag system may not deploy correctly in a collision.

5. How do I diagnose the B1B18 code?

Use a scan tool to confirm the code, then inspect the wiring and connectors for damage or corrosion, and test the resistance of the left side curtain squib circuit.

6. What tools do I need to repair a B1B18 code?

You'll need an OBDII scanner, a multimeter for checking resistance, and possibly wiring repair tools like soldering equipment or crimping tools.

7. How is the B1B18 code typically fixed?

Repairs may involve replacing damaged wiring, cleaning or reconnecting corroded connectors, or replacing the faulty airbag or control module.

8. How much does it cost to fix a B1B18 code?

Costs vary depending on the issue but can range from $100 for minor wiring repairs to several hundred dollars if the airbag or control module needs replacement.

9. Can I reset the B1B18 code without fixing the issue?

Resetting the code without addressing the underlying problem will likely cause the code and the airbag light to return.

10. Is the B1B18 code specific to certain manufacturers or vehicles?

While it is found in many vehicles with side curtain airbags, the exact diagnostic and repair procedures may vary by manufacturer. Always consult your vehicle's service manual.