AutoCodes – Mercury – B1408 Mercury

B1408 Mercury Code - Passenger 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 Passenger Side Curtain, Passenger Side Curtain harness is open or shorted, Passenger 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: B1408 Mercury indicates Passenger Side Curtain Deployment Control 1 Circuit.
Common causes: Common causes include Faulty Passenger Side Curtain, Passenger Side Curtain harness is open or shorted, Passenger 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 959

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 B1408 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, 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 B1408 Mercury - Passenger Side Curtain Deployment Control 1 Circuit - AutoCodes.com — B1408 Mercury Code - Passenger Side Curtain Deployment Control 1 Circuit

What does this mean?

What are the Possible Causes of the DTC B1408 Mercury?

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

How to Fix the DTC B1408 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

B1408:11 Passenger Side Curtain Deployment Control 1 Circuit Short to Ground
B1408:12 Passenger Side Curtain Deployment Control 1 Circuit Short to Battery
B1408:13 Passenger Side Curtain Deployment Control 1 Circuit Open
B1408:1A Passenger Side Curtain Deployment Control 1 Circuit Resistance Below Threshold

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1408 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 B1408 Mercury code?

Need more information on how to fix the B1408 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1408 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 B1408 Mercury Code

1. What are the common symptoms of OBDII code B1408 for Passenger Side Curtain Deployment Control 1 Circuit in a Mercury vehicle?

- Common symptoms include the airbag warning light being illuminated on the dashboard and possible issues with the passenger side curtain airbag deployment.

2. What could be the possible causes of OBDII code B1408 in a Mercury related to the Passenger Side Curtain Deployment Control 1 Circuit?

- Possible causes may include a faulty curtain airbag sensor, damaged wiring or connectors in the circuit, or a defective airbag control module.

3. How can I diagnose the OBDII code B1408 in my Mercury for Passenger Side Curtain Deployment Control 1 Circuit?

- Diagnosis typically involves using a diagnostic scan tool to retrieve the fault code, inspecting the curtain airbag system components, and testing the circuits for continuity and proper operation.

4. Is it safe to drive my Mercury with OBDII code B1408 related to the Passenger Side Curtain Deployment Control 1 Circuit?

- It is recommended to address the issue promptly to ensure the proper functioning of the curtain airbag system in case of an accident. Driving with a faulty airbag system can compromise safety.

5. Can I repair OBDII code B1408 in my Mercury for Passenger Side Curtain Deployment Control 1 Circuit myself?

- While some DIY enthusiasts may attempt to repair this issue, it is advisable to seek professional help from a certified mechanic or technician to properly diagnose and fix the problem.

6. How much does it typically cost to repair OBDII code B1408 in a Mercury for Passenger Side Curtain Deployment Control 1 Circuit?

- The cost of repair can vary depending on the root cause of the issue, but it may involve replacing a sensor, repairing wiring, or reprogramming the airbag control module. Costs can range from a few hundred to over a thousand dollars.

7. Are there any recalls or technical service bulletins related to OBDII code B1408 in Mercury vehicles?

- It is recommended to check with your local Mercury dealership or service center for any recalls or technical service bulletins related to this specific OBDII code and its associated components.

8. What precautions should I take when working on the airbag system related to OBDII code B1408 in my Mercury?

- It is crucial to disconnect the vehicle's battery and wait for at least 10-15 minutes before working on the airbag system to avoid accidental deployment, which can cause serious injury.

9. Can OBDII code B1408 in a Mercury for Passenger Side Curtain Deployment Control 1 Circuit affect the overall safety of the vehicle?

- Yes, a malfunctioning airbag system can compromise the safety of the vehicle occupants in the event of a collision, as the curtain airbags may not deploy correctly to provide protection.

10. How often should I have the airbag system in my Mercury inspected to prevent OBDII code B1408 related issues?

- It is recommended to have the airbag system inspected during regular maintenance intervals or whenever you notice any warning lights or abnormal behavior to ensure proper functionality and safety.