AutoCodes – Mercury – B1405 Mercury

B1405 Mercury Code - Driver Side Curtain Deployment Control 1 Circuit

Quick Answer

The Restraint Control Module (RCM) analyzes the deployment loop resistance to determine if a fault exists. Common causes include Faulty Driver Side Curtain, Driver Side Curtain harness is open or shorted, Driver Side Curtain 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: B1405 Mercury indicates Driver Side Curtain Deployment Control 1 Circuit.
Common causes: Common causes include Faulty Driver Side Curtain, Driver Side Curtain harness is open or shorted, Driver Side Curtain 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 1,133

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 Apr 04, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1405 Mercury Description

The Restraint Control Module (RCM) analyzes the deployment loop resistance to determine if a fault exists. The value displayed in the PID is the deployment loop resistance measured by the RCM. If the value displayed is lower or higher than the desired range (refer to diagram below in illustration), the RCM can set a Diagnostic Trouble Code (DTC). As the deployment loop resistance drifts farther outside the desired range, the chance for a DTC increases. Small variations in resistance can occur due to the effect of road vibrations on terminal fit. Crimps and terminals can be affected by stress and harness movement and can cause an increase in resistance due to wire strain. These variables can result in an intermittent fault. For this reason, the test requires the PID value to be within the desired range before the fault is considered repaired, regardless if the module is reporting an on-demand DTC at the time of diagnosis. Following this direction helps make sure that minor changes in resistance do not create a repeat concern.

OBDII Code B1405 Mercury - Driver Side Curtain Deployment Control 1 Circuit - AutoCodes.com — B1405 Mercury Code - Driver Side Curtain Deployment Control 1 Circuit

What does this mean?

What are the Possible Causes of the DTC B1405 Mercury?

Faulty Driver Side Curtain
Driver Side Curtain harness is open or shorted
Driver Side Curtain circuit poor electrical connection
Faulty Restraint Control Module (RCM)

How to Fix the DTC B1405 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 does this mean?

Code Tech Notes

B1405:11 Driver Side Curtain Deployment Control 1 Circuit Short to Ground
B1405:12 Driver Side Curtain Deployment Control 1 Circuit Short to Battery
B1405:13 Driver Side Curtain Deployment Control 1 Circuit Open
B1405:1A Driver Side Curtain Deployment Control 1 Circuit Resistance Below Threshold

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1405 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.

Need more information about the B1405 Mercury code?

Need more information on how to fix the B1405 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1405 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 B1405 Mercury Code

What does OBDII code B1405 mean for a Mercury vehicle?

B1405 indicates a problem with the Driver Side Curtain Deployment Control 1 Circuit, which is related to the airbag system's curtain deployment for the driver's side.

What are the common symptoms associated with the B1405 code?

Common symptoms include the airbag warning light illuminating on the dashboard, potential issues with the airbag system, and sometimes the inability of the curtain airbag to deploy in a collision.

What could cause the B1405 code to trigger?

Causes may include a faulty airbag control module, damaged wiring or connectors in the deployment circuit, or a malfunctioning airbag sensor.

How can I diagnose the issue related to the B1405 code?

You can start by scanning the vehicle with an OBDII scanner to confirm the code, then inspect the wiring and connectors related to the driver side curtain airbag for damage or corrosion.

Is it safe to drive a vehicle with the B1405 code?

It is not recommended to drive a vehicle with this code, as it indicates a potential failure in the airbag system, which could compromise safety in the event of an accident.

What are some common repair tips for fixing the B1405 code?

Repair tips include checking and repairing any damaged wires or connections, replacing the airbag control module if necessary, and ensuring that the airbag system is properly calibrated after repairs.

Can a faulty airbag sensor cause the B1405 code?

Yes, a faulty airbag sensor can trigger the B1405 code, as it may prevent the curtain airbag from deploying correctly during an accident.

Will clearing the B1405 code reset the airbag system?

Clearing the code will not fix the underlying problem; the issue must be resolved first to ensure the airbag system functions properly.

How much might it cost to repair the issue related to the B1405 code?

Repair costs can vary widely based on the exact cause, but it may range from $100 to $1,000 or more, depending on whether it's a simple wiring fix or requires replacing the airbag control module.