B1401 — Driver Power Window One Touch Window Relay Circuit Short To Ground

body electrical

Is it safe to drive?

Short-term driving is OK Usually safe to drive — body codes rarely affect drivability. Exceptions: exterior lighting and wipers in bad weather, and central locking faults that can leave the car unsecured.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm B1401 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many B0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the body electrical system for damage, corrosion, chafing or poor contact.
Subsystem check Operate the affected function while watching its switch and motor PIDs in live data.
Subsystem check Inspect connectors and wiring at flex points (door jambs, tailgate hinges) — wires break there first.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm B1401 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for B1401 (parts and labor, USD, independent shop rates): Replace the switch or actuator: $120–$450; Repair wiring or connectors: $80–$250; BCM repair or replacement: $300–$900. Overall, fixing B1401 usually costs between $80 and $900. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What are the symptoms of B1401?

Drivers most often notice: no impact on engine operation in most cases, the affected function (locks, windows, lighting, wipers) works intermittently or not at all, warning light on the dashboard.

How much does it cost to fix B1401?

Replace the switch or actuator — $120–$450; Repair wiring or connectors — $80–$250; BCM repair or replacement — $300–$900. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

How do I diagnose B1401 myself?

Start with a scan: confirm B1401, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the body electrical system, and verify the suspect component against live data before buying parts.

What does OBD2 code B1401 mean?

Driver Power Window One Touch Window Relay Circuit Short To Ground (B1401): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system, blown fuse or failed relay.

What is the most common cause of B1401?

The most common causes are: damaged wiring in door jambs or wet areas, faulty switch, motor or actuator of the affected system, blown fuse or failed relay.

When the body control module detects an abnormal electrical condition in the driver's power window one-touch relay circuit, it logs trouble code B1401. This diagnostic code specifically indicates a short to ground somewhere in the circuit responsible for the one-touch up or down function of the driver's window. The term "short to ground" means that the electrical current is finding an unintended path to the vehicle's chassis instead of following its normal route through the wiring and components. This causes the module to recognize that something is wrong with how the circuit is behaving.

The one-touch window relay is part of the broader body electrical system managed by the body control module. When you press the driver window switch briefly, the BCM energizes a relay that supplies full power to the window motor, allowing the glass to travel fully up or down without holding the switch. This convenience feature relies on properly functioning switches, motors, wiring, and the relay itself. The BCM continuously monitors the state of these components. B1401 triggers only after the module observes the short-to-ground condition repeatedly under specific operating conditions, rather than from a single momentary glitch. The freeze frame data stored alongside B1401 records engine load, RPM, coolant temperature, and vehicle speed at the moment the fault was detected, giving you precise context for recreating the failure scenario during diagnosis.

Symptoms of B1401

Engine performance and drivability remain unaffected in most vehicles
The driver window operates intermittently, stops responding, or fails to complete the one-touch movement
Other body functions such as door locks, interior lighting, or wipers may behave erratically if the BCM is overwhelmed or if wiring is shared
An illuminated warning light or indicator appears on the instrument cluster
The window may work normally when operated manually but fails when using the one-touch feature
In some cases, related systems on the same circuit exhibit reduced functionality

Common Causes

Wiring damage in door jambs, boot seals, or areas exposed to moisture — flexing and water intrusion are the top culprits
Connectors that are corroded, pushed back, or have broken locking tabs causing high resistance
Body control module internal failure or software corruption
Blown fuse or failed relay in the power window circuit
Defective window switch, motor, or one-touch relay assembly

How to Diagnose B1401

Plug in an OBD2 scanner, retrieve B1401, and record the associated freeze frame data. Note the engine conditions and driving situation when the fault first appeared.
Check for any other stored trouble codes. Related codes often point to the underlying problem and can help narrow down whether the issue is in the switch, motor, wiring, or module.
Perform a thorough visual inspection of the wiring harness feeding the driver window circuit. Look for cracked insulation, chafing from rubbing against metal edges, and any signs of moisture intrusion or corrosion at connectors.
Test the window switch and motor using a multimeter or oscilloscope while monitoring live data PIDs. Verify that commands sent from the switch actually reach the motor and that current draw is within specification.
Pay special attention to flex points where wires pass through door jambs and hinges. Repeated opening and closing stresses these areas and causes strands to break before visible external damage appears.
Clear B1401, then drive the vehicle through a complete drive cycle, including the conditions captured in the freeze frame. If the code returns, you have confirmed an active fault and can proceed with targeted repairs.

Repair Options and Costs

Depending on which component is at fault, repairs vary significantly in scope and expense:

Wiring harness repair or connector replacement: parts and labor range from $80 to $250
Window switch or actuator motor replacement: parts and labor range from $120 to $450
Body control module repair or full replacement: parts and labor range from $300 to $900

Prices reflect typical rates at independent repair shops in the United States and include both parts and labor.

Total Repair Cost

For most vehicles experiencing B1401, the total bill falls somewhere between $80 and $900 depending on which part needs attention. The majority of cases involve wiring issues or faulty switches, which sit at the lower end of the cost spectrum. BCM replacement is the least common cause but represents the most expensive scenario. Investing in an accurate diagnosis before purchasing parts almost always costs less than replacing the BCM unnecessarily.

Can You Drive with B1401?

In most cases, B1401 does not impair the engine or transmission, so continuing to drive is generally safe from a mechanical standpoint. However, you should address the issue promptly if it involves exterior lighting, wipers during inclement weather, or central locking — these functions directly affect visibility and vehicle security. Leaving the driver window inoperable may not be dangerous, but it can be inconvenient and may mask a wiring problem that worsens over time.

Related OBD2 Codes

B1401 — Driver Power Window One Touch Window Relay Circuit Short To Ground: Causes, Symptoms & Fix

The B1401 OBD2 fault code relates to the Driver Power Window One Touch Window Relay circuit. When the circuit circuit failure, the module cannot properly monitor or control this body system.

At AIscanAuto, we help drivers quickly identify OBD2 trouble codes, understand their root causes, and find the right fix.

Symptoms

Window not responding to switch
Express function not working
Window stuck in position
Possible motor noise

Common Causes

Faulty component — internal damage or wear affecting Driver Power Window One Touch Window Relay
Wiring issues — broken, corroded, or chafed wires in the circuit
Connector problems — loose, oxidized, or moisture-damaged pins
a general circuit failure is detected — can result from wiring faults, connector issues, or component failure
Module input failure — rare, but the control module input stage may be defective

Step-by-Step Diagnosis

Scan with OBD2 tool — Confirm B1401 is active. Check for additional DTCs.
Visual inspection — Examine the Driver Power Window One Touch Window Relay wiring and connector for corrosion or damage.
Check voltage and ground — Use a multimeter to verify proper reference voltage.
Test component — Compare readings to factory specs. A stuck or erratic signal confirms failure.
Check for shorts/opens — Perform continuity tests on the wiring between the component and control module.

Repair & Solutions

If the component is defective, replace the Driver Power Window One Touch Window Relay with an OEM or quality aftermarket part.
Repair any damaged wiring or connectors using proper methods.
Clear the DTC with an OBD2 scanner and test drive to verify the code does not return.
If the code persists after component replacement, inspect the control module connector.

Related Codes

B1402 — Driver Power Window Down Switch Circuit Failure
B1403 — Driver Power Window Up Switch Circuit Failure
B1404 — Driver Power Window Down Circuit Open