NISSAN/INFINITI 387614BF1A SERVOMOTOR
Product Specifications
Product quality
OEM Equivalent Grade
Wholesale price USD
$238.9
Wholesale price CNY
¥1620
bolt MOQ (Minimal order)
1 pcs
local_shipping Production time
20-45 days
package_2 Shipping Weight:
—
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Application (cross references) 2
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| NISSAN/INFINITI | 387614BF1A |
| NISSAN/INFINITI | 387614BF0A |
Overview & Operating Principle
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The SERVOMOTOR is an automotive servomotor — a compact DC electric motor integrated with a reduction gear train and, in most designs, a position feedback element — that converts an electrical command signal from a control module into precise, controlled mechanical displacement of a connected mechanism. Servomotors of this class are used throughout the vehicle wherever a control module must move a mechanism to a specific position, hold it there under load, and confirm that the commanded position has been achieved: HVAC blend door and air distribution flap actuators use small servomotors to position the temperature blend door and mode selector flaps in the heating and ventilation duct system, directing conditioned air to the correct outlets at the commanded temperature mix; electric parking brake actuators use higher-torque servomotors integrated into the rear brake caliper to wind a screw mechanism against the brake pads to apply and release the parking brake on command from the EPB switch or automatic hold system; 4WD transfer case actuators use servomotors to engage and disengage the front axle drive, lock the centre differential, and select high/low range in response to the driver's 4WD mode selector. All share the same operating architecture: the control module commands a target position, the motor drives through the gear train to that position, the feedback element — typically a potentiometer or Hall-effect encoder — reports the actual position back to the module, and the module closes the position control loop to confirm arrival at the target.
This unit — NISSAN/INFINITI 387614BF1A — is manufactured to OEM-equivalent specifications: motor voltage and rated current, gear reduction ratio and output torque, output shaft geometry and travel range, position feedback element type and signal range, housing dimensions and mounting geometry, connector pinout, and operating temperature range are matched to the original part. Supplied as a complete assembly ready for installation. Available wholesale from 238.9 USD, MOQ 1 pcs, production lead time 20-45 days.
Automotive servomotors fail through motor winding open-circuit from thermal overload — a motor commanded to hold a position against a mechanical obstruction draws locked-rotor current that overheats the winding; through gear train tooth fracture from attempting to drive a seized or ice-bound mechanism; through position feedback potentiometer track wear that produces an incorrect position signal causing the control module to drive the motor to the wrong position or report a fault; and through connector pin corrosion in underdash and underbody environments. A servomotor that produces a fault code but runs correctly when commanded directly with 12V has a failed feedback element rather than a failed motor — the motor is serviceable but the position reporting is incorrect.
Symptoms & Diagnostics
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Controlled function permanently stuck in one position — HVAC duct permanently directing air to one outlet, parking brake that will not release, 4WD mode that will not disengage — despite correct electrical commands from the control module — the motor has failed open-circuit or the gear train is mechanically seized; confirm by measuring supply voltage and ground at the motor connector during commanded operation — if voltage is present and ground is correct but the motor does not run, the motor winding or gear train has failed.
Warning light with fault code identifying a specific actuator position error or motor circuit fault — read the exact fault code description before removing any component; codes indicating motor circuit open or short point to motor or wiring failure; codes indicating target position not reached or position sensor out of range point to mechanical obstruction, feedback element failure, or a motor with insufficient torque from worn brushes; distinguish between these before ordering replacement parts.
HVAC system that delivers air only from one set of vents regardless of mode selection, or that maintains a fixed temperature regardless of blend door position commanded — one or more blend door servomotors have failed in a fixed position; identify which actuator controls the affected function from the vehicle service data; on multi-zone climate systems multiple actuators operate in parallel and individual failures produce partial rather than complete system loss.
Clicking, grinding, or buzzing noise from the HVAC duct area, rear caliper, or transfer case during operation — a gear tooth in the servomotor reduction train has fractured, allowing the remaining gear train to rattle during motor operation; or the motor is attempting to drive beyond its mechanical travel limit because the feedback element has failed and the module cannot detect the end-stop position; the noise is audible during commanded operation and typically intermittent as the broken gear skips.
Electric parking brake that applies but will not release, or that releases but will not apply, with the opposite function confirmed serviceable on the other rear caliper — the EPB servomotor on the affected caliper has failed in the applied or released direction; on EPB systems with individual caliper motors, the failed side can be identified by commanding individual caliper operation via a manufacturer-specific scan tool and observing which side does not respond.
4WD system that engages but will not disengage, or that does not engage when commanded, with no fault code stored — the transfer case servomotor has failed mid-travel or at a position that is within the module's expected range, preventing the module from detecting the fault; command the transfer case position change via the scan tool live data and observe whether the actuator position feedback signal changes — a signal that does not move confirms a failed motor or gear train.
Logistics & Customs
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International HS Code
8501.10
EAEU Customs Code (TN VED)
8501 10 910 0
Typical Net Weight
Country of Manufacture
China
Standard MOQ
1 pcs
Production Lead Time
20-45 days
Always verify the exact 8-digit or 10-digit subheading with your customs broker for the destination country, as tariff schedules and duty rates vary by jurisdiction.
Installation Tips
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- Read and record all fault codes from the relevant control module before disconnecting any component — servomotor fault codes describe which actuator position has failed and whether the fault is in the motor circuit, the feedback element, or the mechanical travel; replacing a servomotor based on a symptom without reading the module fault code risks removing a serviceable actuator while the actual fault is in the wiring harness, the connector, or the mechanism the actuator drives; always read codes first and confirm supply voltage and ground at the connector before condemning the motor.
- On EPB caliper servomotors, always use the manufacturer-specific scan tool EPB service mode to retract the piston before removing the caliper — the EPB motor can only retract the piston electrically through the service mode command; attempting to retract the piston manually without scan tool service mode activation will either fail completely or damage the screw mechanism; on a caliper whose EPB motor has completely failed and cannot be retracted electrically, the piston can sometimes be retracted manually using a special EPB wind-back tool designed for the specific caliper architecture.
- On HVAC blend door actuators, confirm the blend door mechanism moves freely by hand before installing the new actuator — a blend door that is stiff, binding, or has a broken pivot will stall the new motor on its first commanded movement, overloading the motor winding and destroying it within seconds; disconnect the new actuator's output shaft from the door link, confirm the door moves freely through its full travel by hand, and only connect the actuator after confirming free mechanical movement.
- Align the new actuator's output shaft to the mechanism's current position before mounting — on HVAC actuators and transfer case motors the output shaft must engage the driven lever or spline at the correct position before the mounting screws are tightened; installing with the output shaft offset from the mechanism's actual position causes the actuator to immediately drive to a commanded position that requires travel in excess of its mechanical range, stalling the motor or stripping the gear train on the first commanded movement.
- Torque all actuator mounting screws to the OEM specification — servomotor housings are typically moulded plastic; overtightening the mounting screws cracks the housing boss and allows the motor to shift position under load, misaligning the output shaft with the driven mechanism; undertightening allows vibration to loosen the screws and shift the actuator position over time; typical mounting screw torque is 2–5 Nm — always use a calibrated low-range torque screwdriver rather than tightening by feel.
- Install the new SERVOMOTOR (NISSAN/INFINITI 387614BF1A), reconnect the wiring connector until it clicks, clear all stored fault codes with a scan tool, command the actuator through its full travel range via the scan tool or by operating the relevant system control, confirm the position feedback signal changes smoothly from minimum to maximum travel without flat spots or hesitation, and verify the controlled function operates correctly at all commanded positions before returning the vehicle to service.
Tools: OBD-II scanner with module-specific actuator command and live data access (mandatory for EPB and 4WD applications), low-range torque screwdriver (2–5 Nm), EPB wind-back tool for mechanically seized EPB calipers, multimeter for supply voltage verification.
Frequently Asked Questions
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Is a calibration or adaptation procedure required after servomotor replacement, and on which systems?
Calibration requirements vary by system type. HVAC blend door actuators on most vehicles self-calibrate automatically — on first power-up after installation the HVAC module commands the actuator through a full sweep from one end-stop to the other to establish the travel range reference; this occurs automatically within the first 30 seconds of ignition-on and requires no scan tool intervention. EPB actuators require a mandatory calibration procedure via manufacturer-specific scan tool after every caliper or motor replacement — the EPB module must establish the new motor's piston position reference before applying and releasing the brake correctly. 4WD transfer case actuators typically require a position calibration via scan tool if the actuator has been replaced at a position different from the module's stored reference. Always clear fault codes and confirm no new codes are stored after calibration before returning the vehicle to service. ok.parts supplies servomotors at wholesale MOQ from 238.9 USD per unit.
How can a failed servomotor be distinguished from a failed control module before replacement?
The definitive isolation sequence is: first, confirm supply voltage and ground at the motor connector during commanded operation — if both are present and correct but the motor does not run, the motor has failed internally; if supply or ground is absent, the fault is in the module output driver or wiring. Second, apply 12V directly to the motor terminals (bypassing the module) — if the motor runs under direct power, the motor is mechanically serviceable and the fault is in the module's output driver or position feedback circuit; if the motor does not run under direct power, the motor winding or gear train has failed. Third, measure the position feedback signal voltage at the connector while manually moving the actuator output shaft by hand — a smoothly varying voltage confirms a serviceable feedback element; a fixed voltage or jumpy output confirms feedback failure. This sequence locates the fault in motor, feedback, wiring, or module without misdiagnosis.
How does the OEM-equivalent aftermarket unit compare to the genuine OEM part?
OEM-equivalent units in this catalogue replicate the current OEM design geometry and material specification. Quality is verified against OEM cross-reference data. When ordering in bulk, confirm with our team that the specification matches the latest OEM revision for your application.
Is white-label or custom packaging available for wholesale orders?
Yes. ok.parts works directly with the manufacturing facility and can accommodate neutral white-label packaging or fully branded packaging with your company logo, part numbers, and barcode. Minimum order quantities and lead times for custom packaging may differ from standard stock. Contact the team via the inquiry form to discuss your specific requirements.
Frequently Replaced Together
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| Part | Reason for Combined Replacement |
|---|---|
| Driven Mechanism (Flap, Lever, or Coupling) HVAC door link, transfer case fork, caliper screw — application-specific | A servomotor that has failed from mechanical overload — stalled by a seized blend door, a frozen transfer case fork, or an EPB mechanism at its travel limit — has transmitted abnormal forces to the driven mechanism throughout the overload period. Inspect the mechanism for deformation, cracking, or wear at the actuator attachment point before fitting the new motor; installing a new motor on a damaged driven mechanism reproduces the same overload condition and destroys the new motor at the same rate as the original. |
| Wiring Harness Connector Application-specific sealed connector | Servomotor connectors in underdash and underbody positions accumulate pin corrosion from humidity and condensation over extended service life. A corroded connector produces high contact resistance that causes the control module to misread the position feedback signal, generating spurious fault codes that appear to indicate motor failure while the motor itself is serviceable. Inspect and replace the connector when a new motor is installed to eliminate connector resistance as a source of immediate post-repair fault codes on the new unit. |
| Control Module HVAC control unit, EPB module, or 4WD control module | A motor that has failed from winding overload due to a sustained locked-rotor condition may have also damaged the control module's output driver transistor through the excessive current drawn during the stall event. If the new motor does not respond to module commands despite correct supply voltage at the connector, test the module output by measuring the voltage change at the motor connector during a commanded movement — a module whose output driver has failed produces no voltage change regardless of the command; the module requires replacement alongside the motor. |