B140D Mercury Code - Second Row Passenger Side Seatbelt Sensor Circuit
Quick Answer
The Restraint Control Module (RCM) continuously monitors the second row right safety belt buckle switch circuits for the following faults: Open circuit, Short to voltage, Short to ground, Current out of range, Faulted second row right safety belt buckle switch. Common causes include Faulty Second Row Passenger Side Seatbelt, Second Row Passenger Side Seatbelt harness is open or shorted, Second Row Passenger 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
- B140D Mercury indicates Second Row Passenger Side Seatbelt Sensor Circuit.
- Common causes
- Common causes include Faulty Second Row Passenger Side Seatbelt, Second Row Passenger Side Seatbelt harness is open or shorted, Second Row Passenger 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 B140D Mercury Description
What are the Possible Causes of the DTC B140D Mercury?
- Faulty Second Row Passenger Side Seatbelt
- Second Row Passenger Side Seatbelt harness is open or shorted
- Second Row Passenger Side Seatbelt circuit poor electrical connection
- Faulty Restraint Control Module (RCM)
How to Fix the DTC B140D 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
B140D:12 Second Row Passenger Side Seatbelt Sensor Circuit Short to Battery
B140D:13 Second Row Passenger Side Seatbelt Sensor Circuit Open
B140D:1D Second Row Passenger Side Seatbelt Sensor Circuit Current Out of Range
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B140D 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 B140D Mercury Code
What does the OBDII code B140D mean?
The B140D code indicates a malfunction in the second row passenger side seatbelt sensor circuit, which is responsible for detecting whether the seatbelt is buckled or unbuckled.
What are the common symptoms of the B140D code?
Common symptoms include the illumination of the seatbelt warning light on the dashboard, failure of the seatbelt reminder chime to activate, and potentially a malfunctioning airbag system.
What could cause the B140D code to trigger?
Possible causes include a faulty seatbelt sensor, damaged wiring or connectors in the sensor circuit, or an issue with the vehicle's body control module (BCM).
How can I diagnose the B140D code?
To diagnose the B140D code, use an OBDII scanner to confirm the code, visually inspect the seatbelt sensor and wiring for damage, and perform a continuity test on the sensor circuit.
Can I drive my vehicle with the B140D code?
While you can technically drive with the B140D code, it's not advisable as it may indicate a potential issue with your seatbelt system, which is crucial for safety.
What are some common fixes for the B140D code?
Common fixes include replacing the faulty seatbelt sensor, repairing or replacing damaged wiring or connectors, and reprogramming or replacing the BCM if necessary.
Is it necessary to reset the code after repairs?
Yes, after performing repairs, it's important to clear the code using an OBDII scanner to reset the warning lights and monitor for any recurring issues.
How much does it typically cost to repair the B140D code?
Repair costs can vary widely, typically ranging from $50 to $300, depending on whether you need to replace the sensor, repair wiring, or address BCM issues.
Can I reset the B140D code myself?
You can reset the B140D code yourself using an OBDII scanner, but if the underlying issue isn't fixed, the code may return. It's best to address the root cause first.
Discuss the causes and fixes for B140D Mercury OBDII Code
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