B2514

Code

LAND ROVER B — Body

Failure of fan Failure in the fan motor control circuit high assembly - circuit failure

Brand: LAND ROVER

Type: B — Body

Views: UK: 12 EN: 15 RU: 12

AI status

Completed

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Page language: EN

Causes

Open circuit in the high-speed fan control wiring
Short to battery (high) on the fan control conductor
Poor or corroded connector/terminal at the fan or module
Failed fan motor or internal short in the motor windings
Failed fan control module / blower motor resistor / blower motor control unit
Blown fuse or faulty relay in the fan supply circuit

Symptoms

Fan will not run on high speed or will not reach expected high speed
Fan works intermittently or only on lower speeds
HVAC blower performance reduced (poor heating/defrost) or engine/radiator cooling performance reduced if radiator fan affected
Illumination of accessory HVAC fault message or MIL depending on system
Possible fuse keeps blowing or electrical burning smell in severe short cases

What to check

Scan with an appropriate dealer-level or compatible scan tool; read B2514 plus any additional related codes and freeze-frame data
Confirm operating conditions required to command fan to high (ambient/engine temp, HVAC settings) and attempt to reproduce
Visually inspect fan assembly, wiring harness and connectors for corrosion, damage, pin push-out, or water ingress
Check relevant fuses and relays for continuity and proper operation
Backprobe the fan motor connector and control module harness with a multimeter/oscilloscope while commanding fan high
Measure battery voltage at the fan supply with ignition ON and while fan is commanded

Signal parameters

Supply voltage at fan power feed: approximately battery voltage when fan requested (~11–14.5 V)
Control signal: PWM duty cycle 0–100% (0% = off, higher duty = higher speed)
PWM frequency typical range: roughly 20–500 Hz (vehicle-specific; confirm with service data)
Static motor resistance: generally low (typical range ~1–5 Ω for many blowers/fans) — compare to OEM specification
Current draw: should increase when commanded to high; excessive current (>spec) suggests short or seized motor

Diagnostic algorithm

Use scan tool: read all stored and pending codes, capture freeze-frame and live data for fan command and actual speed/current. Note conditions when B2514 set.
Verify operating conditions: ensure test conditions that should command high speed are present (HVAC settings, engine temperature). Attempt to reproduce the fault.
Visual inspection: check fan, harness, connectors, ground points and control module for damage, corrosion or water ingress. Repair visible issues.
Check fuses/relays: confirm fuses are intact and relays operate; replace if suspect.
Backprobe and measure: with fan commanded to high, measure supply voltage at fan connector and at the control module output. Expected: battery voltage at supply and a PWM/control output from module. Use an oscilloscope if available to view PWM waveform.
Measure motor resistance and bench test motor: disconnect fan and measure ohms; apply direct 12 V briefly to verify the motor runs at high (observe current draw). If motor does not run when directly powered, replace fan motor assembly.
If motor tests OK but no proper control signal or supply at connector, trace and test wiring continuity and look for short to battery or ground. Repair or replace damaged wiring/connectors as required.
If wiring and motor are good, suspect failed fan control module or HVAC/BCM driver. Confirm with module bench tests or swap with known-good module where appropriate per OEM procedures, then replace module if confirmed.
Clear codes and retest under same conditions to verify repair; monitor for reappearance and re-check any related modules for software updates if intermittent or unexplained faults persist.

Likely causes

Corroded/loose connector at fan motor or control module
Failed fan motor (does not draw/accept correct current at high)
Open or short in the high-speed feed or ground for the fan
Faulty fan control/driver module (internal transistor/PWM driver)
Blown fuse or failed relay supplying the fan high circuit

Fault status

⚠️ Status

Fault detected: Fan motor high-speed control circuit — circuit failure. Fan may not reach high speed; servicing required.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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