B1B68

Code

LAND ROVER B — Body

Air intake servo motor

Brand: LAND ROVER

Type: B — Body

Views: UK: 13 EN: 23 RU: 13

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Page language: EN

Causes

Failed/weak intake servo motor (actuator)
Damaged wiring or poor connector (power, ground, signal)
Blown fuse or poor fuse contact
Mechanical obstruction or seized intake/recirculation flap/linkage
Faulty HVAC control module or body control module
Loss of position feedback (sensor/encoder fault) or out-of-range feedback signal

Symptoms

HVAC stuck in recirculation or fresh-air mode
Inability to change intake mode from dash controls
Rattling, clicking, or no noise from dash when changing intake mode
Diminished HVAC performance or unusual airflow behavior
DTC stored and HVAC control self-test failures

What to check

Read and record all HVAC-related DTCs and freeze frame data
Perform visual inspection of actuator, harness, and connector for damage or corrosion
Verify related fuses and power distribution to HVAC module
Operate intake mode from controls and listen/observe actuator movement
Check for any obstruction in intake/recirculation flaps by gently moving linkage (engine off)
Scan for module communication errors or additional body/HVAC module codes

Signal parameters

Supply voltage to actuator: ~12 V (battery voltage) when commanded ON
Ground continuity: near 0 Ω to chassis ground
Motor winding resistance: manufacturer-specific (typically low ohms) — compare to spec
PWM control: presence of PWM signal from HVAC module (frequency and duty vary by model)
Position feedback voltage (if equipped): typically 0.5–4.5 V across travel
Current draw during operation: check for excessive draw (stall) or no draw

Diagnostic algorithm

Retrieve fault code(s) and clear then re-test to verify repeatability.
Perform visual inspection of actuator, wiring, and connector for damage, corrosion, or pin push-out.
With ignition on, command intake mode while monitoring voltage at the actuator supply and ground for presence when commanded.
Back-probe the control/wfeedback pins to confirm PWM/feedback signals from the HVAC control module (use oscilloscope if available).
Measure motor winding resistance with connector disconnected; compare to spec. Check for short to ground/short to power.
Check actuator current draw while commanding movement. Excessive current indicates binding or seized motor; zero/very low current indicates open circuit or failed motor.
Inspect and manually move the flap/linkage (engine off) to confirm not mechanically bound; remove debris or free linkage if present.
If electrical signals are correct and motor fails, bench-test actuator by applying appropriate test voltage and observe operation; replace if faulty.
If wiring or module faults are suspected, perform wiring continuity and insulation tests back to the HVAC module; repair damaged wiring or connectors.
After repair or replacement, perform actuator calibration/learn procedure per manufacturer, clear codes and verify operation across all modes.

Likely causes

Corroded/loose connector at servo motor
Actuator motor has failed or worn brushes
Flap linkage binding or foreign object preventing movement
Open or short in supply/ground or PWM control wire

Fault status

⚠️ Status

Air intake servo motor - circuit fault or faulty actuator detected (HVAC intake/recirculation door).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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