B1713 — Seat Driver Front Down Switch Circuit Failure

The diagnostic trouble code (DTC) B1713 indicates a problem within the driver’s seat down switch circuit. In simple terms, this code signals that the vehicle’s computer (ECU) has detected an electrical issue in the switch responsible for lowering the driver’s seat. The seat position adjustment may become unresponsive or malfunction because of this fault.

It’s important to note that labeling of this code might vary slightly between different vehicle manufacturers, but the underlying issue remains similar across models. This diagnostic sheet provides a comprehensive overview to help technicians and vehicle owners understand, diagnose, and repair this fault efficiently.

Fast Facts:

System affected: Seat Adjustment/Electrical System
Severity: Moderate — can impact comfort but usually doesn’t immobilise the vehicle
Main symptoms: Seat switch unresponsive, warning lights, or error messages
Driveability: Limited — driving is possible, but seat adjustment features may be impaired

Manufacturer variations for trouble code B1713

Different vehicle manufacturers might assign distinct labels or code variations for similar faults related to the driver’s seat down switch circuit. While the underlying issue remains consistent, the specific diagnostic label can differ. Here are some known variations:

Volkswagen/Audi: 9M2-913-918
Ford: U0162 or B1713
BMW: 6139 or 613A
Mercedes-Benz: 177D or 1773
Toyota: C2400 or C240A

Always refer to the specific manufacturer’s documentation or technical resources for exact label definitions, as codes can vary considerably between brands and models.

What does trouble code B1713 mean?

This OBD-II trouble code signals that the vehicle’s ECU has detected a faulty or open circuit within the driver’s seat down switch wiring.

The seat down switch is part of the seat adjustment controls, often integrated with electronic seat runners. The ECU continuously monitors this circuit for signs of electrical anomalies, such as short circuits or broken connections. When it detects such issues, it triggers the B1713 code as a warning.

The trigger points include:

Electrical disconnection or breakage in the wiring harness
Faulty switch sensor or internal failure
Corrosion or contamination within the connector or wiring
Malfunction of the seat adjustment control module or related components

This code often appears in the context of an issue with seat adjustment functions, especially when the driver notices that the seat does not lower when pressing the control switch.

Severity and risks of trouble code B1713

This code is considered moderate in severity. It typically indicates an electrical fault that affects the operation of the seat adjustment system. While it does not normally impair the vehicle’s ability to operate on the road, it can cause discomfort or inconvenience due to loss of adjustable seating functions.

Potential risks include:

Inability to adjust the seat position, especially during long trips where comfort adjustments are necessary
Electrical or wiring issues that could potentially lead to further faults if left unaddressed
Possible failure of other seat functions if linked to broader electrical problems

In conclusion, vehicle operation remains safe, and the vehicle can generally be driven. However, addressing this fault promptly will ensure comfort and prevent further electrical or mechanical issues.

Symptoms of trouble code B1713

When this fault occurs, drivers might notice several symptoms related to the seat adjustment system’s malfunction. Usually, these symptoms revolve around the inoperative or inconsistent performance of the seat’s lowering function, but can include other cues:

Inability to lower the driver’s seat using the switch
Warning lights or messages on the dashboard related to seat adjustment
Unresponsive seat controls or erratic seat movements
Intermittent or no response from seat adjustment switches
Possible audible clicking or clicking sounds from seat mechanism if related electrical faults exist
Failure to clear or reset the fault after switching off and restarting the vehicle

Understanding these symptoms can help identify the problem early, preventing inconvenience and potential further electrical issues.

Most likely causes of trouble code B1713

This diagnostic trouble code is generally caused by a range of faults, mostly related to electrical issues involving the seat down switch circuit. Below is a ranked list of the most common causes:

Faulty seat down switch: The switch itself might be defective or internally damaged, leading to circuit open or short conditions.
Damaged wiring harness or connectors: Wear, corrosion, or breakage in wiring leading to the switch can disrupt electrical flow, triggering the fault.
Corrosion or contamination: Moisture or dirt in the connector or wiring area can cause poor electrical contact, resulting in circuit faults.
Faulty seat control module or ECU: Although less common, a malfunctioning control module responsible for seat positions might generate false faults.
Related fuse or relay failure: A blown fuse or defective relay affecting seat circuitry could cause the circuit to open or malfunction.

How to diagnose trouble code B1713

Diagnosing this fault involves a systematic approach aimed at pinpointing the electrical issue with minimal risk. Here are the generic diagnostic steps:

Visual inspection: Check the seat down switch for obvious physical damage, such as cracks or broken parts. Inspect the wiring harness and connectors for signs of wear, corrosion, or disconnection.
Test the switch: Use a multimeter to verify continuity of the switch when pressed and released, confirming whether it opens or closes properly.
Inspect wiring continuity: Perform continuity tests on wiring connectors leading to the switch to ensure there are no open circuits.
Check power supply and ground: Ensure that the circuit has proper voltage supply and grounding as per manufacturer specifications.
Use live data: Access appropriate diagnostic tools to monitor seat switch signals and ECU data in real-time when pressing the switch.
Fuse and relay check: Verify that all relevant fuses and relays are intact and functioning correctly, replacing any faulty components.
Interrogate the control module: If necessary, use manufacturer-specific diagnostic software to test the seat control unit’s operation and communication.

Possible repairs for trouble code B1713

Once the root cause has been identified, the appropriate repairs can be performed. Options vary from simple fixes to more complex replacements, often requiring professional assistance:

Replace the seat down switch: If the switch is defective, swapping it out is a straightforward and often basic repair. This should be done by qualified technicians if module calibration is needed.
Repair or replace wiring harness or connectors: Damaged wiring or corroded connectors should be repaired or replaced to restore proper electrical contact. This is a task suitable for experienced technicians.
Clean or replace affected connectors: Sometimes, cleaning corrosion or applying dielectric grease can resolve contact issues if damage is minimal.
Replace faulty fuse or relay: If identified as the cause, replacing the fuse or relay is a simple fix, often considered a basic repair.
Reset or reprogram the seat control module: In cases where the module is faulty, a professional reprogramming or replacement may be necessary, especially if the fault persists after physical repairs.

Following manufacturer guidelines and safety procedures ensures the longevity of repairs and reduces the risk of recurring faults.

Vehicles commonly associated with trouble code B1713 in Europe

This fault is often encountered across various makes and models, particularly those with electronically adjustable seats. In Europe, common affected brands include:

Volkswagen Group (Volkswagen, Audi, Skoda, Seat): Vehicles equipped with electric seat adjustment systems frequently report this fault. Examples include Golf, A3, Octavia, and Seat Leon models.

Ford: Certain models with power-adjusted seats, such as Focus and Fiesta, may see similar issues.

BMW: E-series and F-series vehicles with electric seats can occasionally present this trouble code.

Mercedes-Benz: Models with electronically adjustable seats, especially in E-Class and C-Class, are susceptible.

Being proactive about electrical maintenance in seat systems, especially in used or older vehicles, can help prevent such faults.

Frequent mistakes with trouble code B1713

Diagnosing and repairing this fault can sometimes lead to common errors. Here are mistakes to avoid to ensure a successful repair process:

Assuming the switch itself is always faulty: Sometimes, wiring or connectors are the root cause, not the switch.
Neglecting visual inspection: Overlooking obvious damage or corrosion can lead to incomplete repairs and recurring faults.
Replacing parts without proper testing: Swapping components like switches or relays without confirming their failure can result in unnecessary expense and effort.
Ignoring related electrical issues: Faults in other parts of the seat system or fuse box may cause the circuit fault, so a holistic diagnostic approach is essential.
Using incorrect or incompatible parts: Ensure replacement components match OEM specifications for safety and reliability.

FAQ — trouble code B1713

Can this code disappear on its own?
Typically, no. The B1713 code usually persists until the root electrical issue is fixed. Sometimes, temporary electrical glitches caused by moisture or loose connections may clear temporarily but tend to recur if underlying causes are not addressed.

Can I keep driving?
In most cases, yes. This fault generally affects seat adjustment functions but does not impair essential vehicle operation. However, if the seat is in an inconvenient or unsafe position, or if other electrical faults occur, it’s advisable to get the issue diagnosed and repaired promptly.

Why does the code return after clearing?
The code reappears because the underlying problem—such as damaged wiring, a faulty switch, or corrosion—was not resolved during the initial repair attempt. Persistent faults require thorough inspection and fixing of the root cause to prevent the code from recurring.