B1395 — Power Door Memory Lock Relay Circuit Short To Ground

**B1395** is a diagnostic trouble code (DTC) that indicates a problem within the power door lock system. Specifically, it points to a **short circuit to ground** in the relay circuit responsible for the **memory function** of the power door locks. This code is typically encountered during emissions testing or vehicle diagnostics when the vehicle’s onboard computer detects an electrical fault in the related circuitry.

Note: Labels and coding nomenclature may vary between different vehicle manufacturers and OEMs (Original Equipment Manufacturers). Always cross-reference with manufacturer-specific diagnostic charts for precise troubleshooting.

Fast Facts

System affected: Power Door Lock System (Memory Lock Relay Circuit)
Severity: Moderate — may affect door lock operation but generally not a safety concern unless the issue causes further electrical faults
Main symptoms: Malfunction of memory lock functions, diagnostic warning lights, or error codes during vehicle scan
Driveability: No — this code generally does not affect the vehicle’s ability to operate but may impair convenience features

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Manufacturer variations for trouble code B1395

Different vehicle manufacturers may label or code this issue slightly differently depending on their diagnostic standards and system architecture. The same fault may appear under varying labels but with similar diagnostic implications. Below are some known variations:

Ford: B1395 — Power Door Lock Memory Lock Relay Circuit Short to Ground
BMW: 5F20 — Circuit Short in Door Lock Memory Relay
Volkswagen / Audi / Skoda / SEAT: B1395 or related relay circuit fault codes in VAG-COM/OBD-II
Mercedes-Benz: Codes such as 211-xxxx series indicating relay or circuit faults in the door control modules

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What does trouble code B1395 mean?

In simple terms, B1395 indicates that the vehicle’s electronic control unit (ECU) has detected a **short circuit to ground** in the **power door lock’s memory lock relay circuit**. The **relay** is an electrical switch that controls power to specific functions—in this case, the *memory feature* that recalls door lock positions. When this circuit is **shorted to ground**, it means that electricity is taking an unintended path to the vehicle’s chassis or earth, which can cause malfunction or even damage to the electrical system.

The **ECU monitors the circuit’s integrity** using input signals and internal resistance checks. When it finds that the circuit’s resistance drops below a safe threshold indicating a direct connection to ground, it triggers B1395 to alert the driver and prevent potential electrical damage.

This fault most often appears during routine scans or when the door lock system isn’t functioning as expected, such as the memory function not saving or recalling the preferred door lock position, or other electronic door features malfunctioning.

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Severity and risks of trouble code B1395

The severity of a **B1395** code is typically considered *moderate*. While it generally does not compromise essential vehicle operations or safety, the presence of an electrical short can lead to various issues if left unaddressed. Electrical shorts pose a risk of damaging the wiring harness, relays, or control modules, which could result in more extensive and costly repairs over time.

Potential risks include:

Intermittent or complete failure of the power door lock memory functions
Possible drain on the vehicle’s electrical system, affecting battery life
Potential for further electrical faults if the short circuit persists or worsens

Can the vehicle be driven? — Yes. The vehicle remains operational, but the issue may impair comfort features or cause warning lights to stay illuminated. It’s advisable to schedule repairs promptly to prevent further complications.

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Symptoms of trouble code B1395

The presence of **B1395** often manifests through specific digital or mechanical clues, primarily related to the **power door lock system**:

The **memory function** of power door locks fails to recall previous settings
The **door locks** do not operate as intended during remote or keyless entry operations
The **electrical system warnings** appear on the dashboard (such as the check light or door lock warning lights)
Unusual **clicking or relay activation noises** near the door lock control modules or fuse box
Persistent diagnostic trouble codes stored in the vehicle’s computer system

In some cases, drivers may notice that locks respond intermittently or that certain electronic features related to the locks are non-functional. These symptoms collectively point toward an electrical fault in the circuit, consistent with the code’s indication.

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Most likely causes of trouble code B1395

Understanding the root causes of B1395 helps streamline diagnosis and repair. Several typical issues can lead to this fault code:

Damaged or shorted wiring harness—Exposed or frayed wires in the door lock relay circuit or associated wiring can cause shorts to ground.
Faulty relay or relay circuit—A malfunctioning relay can internally short or fail, leading to a short circuit detection.
Corrosion or water ingress—Moisture within the door or control modules can cause corrosion, increasing the risk of electrical shorts.
Burnt or damaged control module—If the electronic control unit or door lock control module has experienced electrical surges or damage, it may short internally.
Incorrect or damaged installation—Previous repairs or aftermarket modifications that involve the door lock wiring can introduce shorts or wiring faults.

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How to diagnose trouble code B1395

Diagnosing **B1395** requires a systematic approach to ensure the fault is correctly identified and repaired. Below are generic steps suitable for most vehicles:

Perform a visual inspection—Check the wiring harness around the door lock motors and relays for signs of damage, wear, corrosion, or water ingress.
Check the relay and connections—Test or replace the relay controlling the power door lock memory circuit, ensuring it operates properly and has a good connection.
Use a scan tool to view live data—Monitor the circuit voltage and relay operation during door lock commands to identify abnormal behavior.
Inspect and test wiring continuity—Using a multimeter, verify that wires in the circuit are continuous and not shorted to ground or open circuits.
Check for additional DTCs—Identify if other related electrical faults are present, which could contribute to the B1395 code.
Consult manufacturer-specific wiring diagrams—Confirm wiring routing and relay specifications specific to the vehicle model.

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Possible repairs for trouble code B1395

Based on the identified root causes, the following repairs may be necessary. Some fixes are straightforward, while others may require professional intervention.

Replace damaged wiring or repair wiring harness—A basic repair requiring some electrical knowledge. Suitable for DIY with proper tools.
Replace faulty relay—If the relay is found defective or internally shorted, installing a new relay is recommended. This is a relatively simple repair.
Address corrosion or water ingress—Cleaning or drying the control module and wiring, sealing waterproofing if needed. Usually requires professional participation in complex cases.
Replace or reprogram the control module—If internal damage is suspected, replace the module or have it reprogrammed by a technician.
Perform proper wiring routing and secure aftermarket installations—Ensuring that any recent modifications don’t introduce electrical faults.

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Vehicles commonly associated with trouble code B1395 in Europe

While B1395 can appear across various vehicle brands, certain models and engine families are more frequently affected. Here is a general overview:

Ford: Focus, Fiesta, Mondeo — Particularly models with electric door locks and memory functions

BMW: 1 Series, 3 Series, 5 Series — Especially those with advanced electronic locking systems

Volkswagen Group: Golf, Passat, Tiguan — Variants with electric locking modules and comfort features

Mercedes-Benz: C-Class, E-Class — Vehicles with integrated electronic control modules and complex wiring

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Frequent mistakes with trouble code B1395

Diagnosing and repairing electrical faults such as B1395 can lead to errors if proper procedures are not followed. Common mistakes include:

Skipping a thorough wiring inspection—focusing solely on the relay or control module can overlook damaged wiring
Using incorrect or low-quality replacement relays, which may not withstand vehicle electrical demands
Ignoring water ingress or corrosion that could cause recurrent shorts after repair
Failing to clear other related fault codes before concluding the diagnosis
Assuming the problem is solely within the relay without verifying the entire circuit path

Quick FAQ — trouble code B1395

Can this code disappear on its own?
Typically, no. Once a short circuit condition exists, the code remains until the underlying cause is fixed. Sometimes, temporary wiring faults or moisture exposure may cause intermittent codes, but persistent issues require repair.

Can I keep driving?
In most cases, yes. The vehicle can often be driven without immediate danger, but electrical problems might lead to further faults or drain the battery. It’s advisable to schedule repairs promptly.

Why does the code return after clearing?
The underlying cause—such as damaged wiring, a faulty relay, or water ingress—remains unaddressed, causing the fault to recur when the system tests the circuit again during subsequent scans.