AutoCodes – Mercury – B0070 Mercury

B0070 Mercury Code - Driver Seatbelt Pretensioner 'A' Deployment Control

Quick Answer

The Restraints Control Module (RCM) analyzes the deployment loop resistance to determine if a fault exists. Common causes include Faulty Driver Seatbelt Pretensioner 'A', Driver Seatbelt Pretensioner 'A' harness is open or shorted, Driver Seatbelt Pretensioner 'A' 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: B0070 Mercury indicates Driver Seatbelt Pretensioner 'A' Deployment Control.
Common causes: Common causes include Faulty Driver Seatbelt Pretensioner 'A', Driver Seatbelt Pretensioner 'A' harness is open or shorted, Driver Seatbelt Pretensioner 'A' 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 2,231

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B0070 Mercury Description

The Restraints 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. This test uses the process of elimination to diagnose each part of the deployment loop circuit including:
- Wiring
- Connections
- Driver seatbelt anchor pretensioner
- RCM

OBDII Code B0070 Mercury - Driver Seatbelt Pretensioner 'A' Deployment Control - AutoCodes.com — B0070 Mercury Code - Driver Seatbelt Pretensioner 'A' Deployment Control

What does this mean?

What are the Possible Causes of the DTC B0070 Mercury?

Faulty Driver Seatbelt Pretensioner 'A'
Driver Seatbelt Pretensioner 'A' harness is open or shorted
Driver Seatbelt Pretensioner 'A' circuit poor electrical connection
Faulty Restraints Control Module (RCM)

How to Fix the DTC B0070 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

B0070:11 Driver Seatbelt Pretensioner 'A' Deployment Control: Circuit Short to Ground
B0070:12 Driver Seatbelt Pretensioner 'A' Deployment Control: Circuit Short to Battery
B0070:13 Driver Seatbelt Pretensioner 'A' Deployment Control: Circuit Open
B0070:1A Driver Seatbelt Pretensioner 'A' Deployment Control: Circuit Resistance Below Threshold

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0070 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 B0070 Mercury code?

Need more information on how to fix the B0070 Mercury code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0070 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 B0070 Mercury Code

1. What are the common symptoms of OBDII code B0070 in a Mercury related to the Driver Seatbelt Pretensioner 'A' Deployment Control?

- The common symptoms include the airbag warning light illuminating on the dashboard and possible non-deployment of the driver seatbelt pretensioner in the event of a crash.

2. What are the possible causes of OBDII code B0070 related to the Driver Seatbelt Pretensioner 'A' Deployment Control in a Mercury?

- The code B0070 can be triggered by issues such as a faulty seatbelt pretensioner, damaged wiring harness, or a malfunction in the deployment control module.

3. How can I diagnose the OBDII code B0070 in my Mercury indicating an issue with the Driver Seatbelt Pretensioner 'A' Deployment Control?

- A diagnostic scan tool can be used to retrieve the specific fault code B0070. Additionally, a visual inspection of the seatbelt pretensioner and its wiring can help identify any visible damage.

4. What are the potential risks of driving with OBDII code B0070 related to the Driver Seatbelt Pretensioner 'A' Deployment Control unresolved in a Mercury?

- Driving with this issue unresolved may compromise the functionality of the driver's seatbelt pretensioner, potentially increasing the risk of injury in the event of a collision.

5. Can I repair OBDII code B0070 related to the Driver Seatbelt Pretensioner 'A' Deployment Control in my Mercury myself?

- While some DIY enthusiasts may attempt to address this issue, it is recommended to consult a professional mechanic or dealership due to the safety implications involved in handling airbag and seatbelt components.

6. How much does it typically cost to repair OBDII code B0070 in a Mercury associated with the Driver Seatbelt Pretensioner 'A' Deployment Control?

- The cost of repair can vary depending on the exact cause of the issue. Expenses may include the cost of replacement parts, labor charges, and diagnostic fees, which can range from a few hundred to over a thousand dollars.

7. Is it safe to drive my Mercury with the airbag warning light on due to OBDII code B0070 related to the Driver Seatbelt Pretensioner 'A' Deployment Control?

- It is not advisable to drive the vehicle with the airbag warning light illuminated, as it indicates a potential safety issue with the seatbelt pretensioner system that should be promptly addressed by a qualified technician.

8. How long does it typically take to repair OBDII code B0070 in a Mercury involving the Driver Seatbelt Pretensioner 'A' Deployment Control?

- The repair time can vary based on the underlying cause of the issue and the availability of parts. In general, resolving this type of problem may take a few hours to a full day at the repair shop.

9. Can a faulty seatbelt pretensioner trigger OBDII code B0070 in a Mercury without any visible signs of damage?

- Yes, a seatbelt pretensioner may malfunction internally without any visible external damage, leading to the triggering of code B0070 related to the Driver Seatbelt Pretensioner 'A' Deployment Control.

10. Are there any recalls or technical service bulletins related to OBDII code B0070 in Mercury vehicles for the Driver Seatbelt Pretensioner 'A' Deployment Control issue?

- It's advisable to check with your local Mercury dealership or visit the National Highway Traffic Safety Administration (NHTSA) website to see if there are any recalls or technical service bulletins related to this specific problem.