B1415 — Power Window LR Motor Circuit Open

OBD2 code B1415 flags a problem with the body electrical system (power window LR motor circuit open). The car is usually drivable while you plan the repair. Common culprits: body control module (BCM) fault, damaged wiring in door jambs or wet areas, blown fuse or failed relay.

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 B1415 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 Do a continuity test end-to-end on the power window LR motor circuit and wiggle the harness while measuring — intermittent opens show up as fluctuating readings.
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 B1415 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for B1415 (parts and labor, USD, independent shop rates): BCM repair or replacement: $300–$900; Replace the switch or actuator: $120–$450; Repair wiring or connectors: $80–$250. Overall, fixing B1415 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 is the most common cause of B1415?

The most common causes are: body control module (BCM) fault, damaged wiring in door jambs or wet areas, blown fuse or failed relay.

Is it safe to drive with B1415?

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.

What are the symptoms of B1415?

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

Will B1415 clear itself?

Sometimes B1415 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

How do I diagnose B1415 myself?

Start with a scan: confirm B1415, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the power window LR motor, and verify the suspect component against live data before buying parts.

When your check engine light pops up and a scan tool pulls code B1415, it's pointing you toward a problem in the left-rear power window circuit. Specifically, the body control module has detected that the electrical path feeding the left-rear window motor is interrupted—meaning no current is reaching the motor when you press the switch. Without a complete circuit, that window simply won't move.

The body control module constantly monitors the health of all power window circuits across your vehicle. When you activate a window switch, the module sends voltage to the corresponding motor and expects to see current flow in return. Code B1415 triggers when the module sends that command but receives no response—a clear sign of an open circuit. Most manufacturers require this condition to appear across multiple drive cycles before storing the code permanently, which helps filter out temporary electrical glitches.

When diagnosing B1415, technicians start by recording the freeze frame data stored alongside the code. This snapshot captures engine RPM, load, coolant temperature, and vehicle speed at the exact moment the fault occurred. That context often points you toward the root cause much faster than jumping straight into the wiring.

Symptoms

The left-rear power window fails to respond when you press the up or down switch
The window may work intermittently, functioning normally on some occasions and refusing to move on others
Other body functions on the same circuit (if shared) could be affected, though this varies by vehicle design
The powertrain itself operates normally—your engine, transmission, and drivetrain feel unaffected
A check engine or body system warning light illuminates on the instrument cluster
You may notice a faint clicking sound from the door panel when activating the switch, indicating the module is attempting to send power

Common Causes

The most frequent culprit behind B1415 is a physical break in the wiring harness running to the left-rear window motor. Door hinges and door jambs create natural flex points where wires bend repeatedly, eventually fatiguing the copper conductors inside. Corrosion at connectors ranks second—moisture intrusion at the door connector eventually creates resistance or complete separation.

Backed-out or loose connector pins show up regularly, especially on vehicles that have had door panels removed for repairs or speaker upgrades. A pin that isn't fully seated creates high resistance, mimicking an open circuit. Blown fuses in the power window distribution circuit also trigger this code, though a fuse failure usually affects multiple windows simultaneously rather than just the left-rear unit.

An internally failed window motor—where the armature or brushes inside have broken—represents a genuine component failure rather than a wiring issue. Faulty window switches occasionally cause this code too, though they more commonly produce short-circuit codes instead. The body control module itself can fail, but this accounts for only a small percentage of B1415 cases and typically affects multiple systems simultaneously.

How to Diagnose

Connect your OBD2 scanner and verify that B1415 is the only stored code, then record all available freeze frame data before clearing anything. This information is invaluable when replicating the failure condition.
Research technical service bulletins for your specific make, model, and model year. Many body electrical faults have documented factory fixes, software recalibrations, or known defect patterns that service bulletins describe.
Perform a thorough visual inspection of the left-rear door harness and connector. Look for damaged insulation, cracked wire boots at the hinge point, greenish corrosion buildup, and ensure the connector is fully seated and locked.
Test circuit continuity end-to-end from the body control module output to the motor ground using a digital multimeter. Move the door harness through its full range of motion while monitoring continuity—intermittent opens often appear only when the wire is flexed in a specific position.
Operate the window switch while monitoring voltage at the motor connector in live data mode, if your scan tool supports body module PID streaming. This confirms whether the module is attempting to send power and helps isolate the problem between the switch input and motor output.
Verify proper ground integrity at the window motor. A poor ground creates identical symptoms to an open feed circuit, so don't assume the problem is always upstream.

Repair Options

Addressing B1415 starts with fixing the cheapest probable causes before considering component replacement. Connector cleaning and re-pinning typically runs $50-$100 at a shop, while full wiring harness repair for damaged sections costs $80-$250 depending on accessibility. If the window switch itself is faulty, replacement generally falls between $120-$450 when combining parts and labor. In rare cases where the body control module requires replacement, expect to pay $300-$900 for the repair.

How Much Does It Cost to Fix B1415?

The total repair bill hinges entirely on what the diagnosis uncovers. When the fix involves cleaning connectors or repairing a broken wire, most shops charge between $80 and $250 total. Replacing a failed window motor or switch typically lands in the $120-$450 range. The upper boundary comes into play only when the body control module itself needs replacement, which runs $300-$900. Most B1415 repairs end up on the lower end of that spectrum—an accurate diagnosis before purchasing parts always saves money in the long run.

Can You Drive with B1415?

Severity: Short — Generally safe to continue driving with this code stored. The fault affects only the left-rear window motor, leaving your engine, transmission, brakes, and steering completely unaffected. However, consider whether a non-operational rear window creates a visibility blind spot that compromises safety, especially if you regularly transport passengers or cargo in the left-rear seating position.