B140C Mercury Code - Second Row Driver Side Seatbelt Sensor Circuit
Quick Answer
The Restraint Control Module (RCM) continuously monitors the second row left safety belt buckle switch circuits for the following faults: Open circuit, Short to voltage, Short to ground, Current out of range, Faulted second row left safety belt buckle switch. Common causes include Faulty Second Row Driver Side Seatbelt, Second Row Driver Side Seatbelt harness is open or shorted, Second Row Driver Side Seatbelt 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
- B140C Mercury indicates Second Row Driver Side Seatbelt Sensor Circuit.
- Common causes
- Common causes include Faulty Second Row Driver Side Seatbelt, Second Row Driver Side Seatbelt harness is open or shorted, Second Row Driver Side Seatbelt 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.
Code B140C Mercury Description
What are the Possible Causes of the DTC B140C Mercury?
- Faulty Second Row Driver Side Seatbelt
- Second Row Driver Side Seatbelt harness is open or shorted
- Second Row Driver Side Seatbelt circuit poor electrical connection
- Faulty Restraint Control Module (RCM)
How to Fix the DTC B140C 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.
Code Tech Notes
B140C:12 Second Row Driver Side Seatbelt Sensor Circuit Short to Battery
B140C:13 Second Row Driver Side Seatbelt Sensor Circuit Open
B140C:1D Second Row Driver Side Seatbelt Sensor Circuit Current Out of Range
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B140C 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.
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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.
Frequently Asked Questions about B140C Mercury Code
1. What are common symptoms of OBDII code B140C in a Mercury related to the second row driver side seatbelt sensor circuit?
Symptoms may include the airbag warning light staying on, seatbelt warning light malfunctioning, and potential issues with the airbag system.
2. What are possible causes of OBDII code B140C in a Mercury for the second row driver side seatbelt sensor circuit?
Potential causes may include a faulty seatbelt sensor, damaged wiring or connectors, a defective airbag control module, or issues with the seatbelt buckle.
3. How can I diagnose the OBDII code B140C in a Mercury for the second row driver side seatbelt sensor circuit?
Diagnosis typically involves using a scan tool to retrieve the specific fault code, inspecting the seatbelt sensor and related components for damage, and testing the wiring and connectors for continuity.
4. Can I repair OBDII code B140C in a Mercury related to the second row driver side seatbelt sensor circuit myself?
While some DIY enthusiasts may attempt to address this code, it is recommended to have a qualified mechanic diagnose and repair the issue due to the complexities of the airbag system.
5. Is it safe to drive my Mercury with OBDII code B140C related to the second row driver side seatbelt sensor circuit?
It is not advisable to drive the vehicle with this code present, as it may indicate a potential safety issue with the airbag system or seatbelt sensor, compromising occupant protection in the event of a collision.
6. How much does it typically cost to repair OBDII code B140C in a Mercury for the second row driver side seatbelt sensor circuit?
Repair costs can vary depending on the underlying cause of the issue, but expect to pay for diagnostic time, replacement parts, and labor, with the total cost ranging from a couple hundred to over a thousand dollars.
7. Can resetting the OBDII system clear the B140C code related to the second row driver side seatbelt sensor circuit in a Mercury?
Resetting the system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the vehicle is driven and the system detects the fault again.
8. Are there any recalls or technical service bulletins related to OBDII code B140C in a Mercury for the second row driver side seatbelt sensor circuit?
It's recommended to check with the manufacturer or a trusted dealership to inquire about any recalls or bulletins related to this specific OBDII code to see if there are any known issues or remedies.
9. How important is it to fix OBDII code B140C in a Mercury for the second row driver side seatbelt sensor circuit promptly?
Prompt repair is crucial, as this code typically indicates a fault in the safety system designed to protect occupants in the vehicle. Delaying repairs could compromise the effectiveness of the airbag system in the event of an accident.
10. Can OBDII code B140C in a Mercury related to the second row driver side seatbelt sensor circuit affect the vehicle's overall safety rating?
While this specific code may not directly impact the safety rating, unresolved issues with the airbag system or seatbelt sensors could potentially affect the vehicle's overall safety performance in crash tests or real-world scenarios.
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