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Home / DTC / B1286 — Left air intake servo motor - circuit short-land

B1286 — Left air intake servo motor - circuit short-land

Detailed page for trouble code B1286.

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Code

B1286

LAND ROVER B — Body

Left air intake servo motor - circuit short-land

Brand: LAND ROVER
Type: B — Body
Views: UK: 6 EN: 10 RU: 7
AI status
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ready
Completed 100%
Page language: EN

Causes

  • Damaged/shorted wiring harness (abrasion, pinched, chafed) between HVAC module and left intake servo
  • Corroded or contaminated connector (moisture, corrosion) at the servo or module
  • Internal short or failure inside the left air intake servo motor
  • Shorted pin at HVAC control module output (failed driver transistor)
  • Water ingress or foreign debris causing shorts
  • Poor or missing ground at related circuits (intermittent contact)

Symptoms

  • DTC B1286 stored and MIL/airbag not expected (body code)
  • Left intake door stuck in one position (recirculate or fresh) or not responding to mode changes
  • Reduced or uneven cabin airflow or inability to select recirculation/fresh air
  • Audible abnormal noise from HVAC area when commanding intake flap
  • Blown related fuse or additional HVAC electrical faults if short is severe

What to check

  • Read stored DTCs and freeze-frame data with a diagnostic scanner; record related HVAC codes
  • Use scan tool to command left air intake servo and observe response/live data
  • Visually inspect wiring and connectors for damage, corrosion, water ingress, or pinched wiring from servo to module
  • Check connector pins for corrosion, pushed-back pins, or contamination; ensure connector is fully seated
  • Check fuses and relays related to HVAC circuits
  • With ignition off, disconnect left intake servo connector and measure resistance between the control signal and ground to check for short to ground

Signal parameters

  • Control drive: typically a switched/PWM drive from HVAC module — expected to vary with command (0–12 V range on drive during operation)
  • Feedback/position sensor: typically a low-voltage potentiometer or resistive feedback (approx. 0–5 V range across travel)
  • Normal actuator coil resistance: low ohms (tens of ohms) — an open circuit is high/OL, a short to ground will show near 0 Ω to ground
  • Short condition: control pin measures ~0 V relative to ground at rest and may pull excessive current when commanded (fuse may blow)

Diagnostic algorithm

  1. Connect a diagnostic scan tool, read fault memory and freeze-frame, note any related HVAC codes.
  2. Attempt to actuate the left air intake servo via the scanner. Observe whether the door moves and check live data for feedback voltage changes.
  3. Visually inspect the left intake servo, connector and wiring harness. Look for corrosion, water ingress, broken, pinched or chafed wires, and repair obvious damage.
  4. With ignition OFF, disconnect the left intake servo connector. Using a multimeter, measure continuity/resistance between the control drive pin and chassis ground. A direct short (near 0 Ω) indicates harness short to ground or module short.
  5. Measure resistance between the servo power and ground pins to check for internal short in the actuator. If the actuator shows a short to ground, replace the servo.
  6. With the actuator disconnected, turn ignition ON and command the actuator while measuring voltage at the module output wire. If the module output is shorted to ground (no voltage present or excessive current draw), suspect wiring to ground or HVAC module driver fault.
  7. Perform a wiggle test on the harness and monitor for intermittent behavior. Repair/replace damaged wiring, repair corroded connectors, and apply dielectric grease as needed.
  8. If wiring checks good and actuator tests open/not shorted, consider replacing the HVAC control module or have module output stage tested by a specialist.
  9. After repairs, clear codes and perform function test and road/operation verification to confirm the fault does not return.

Likely causes

  • Wiring abrasion or connector corrosion at the left intake servo (most common)
  • Internal short/failure inside the left intake servo motor
  • Failed output driver in HVAC control module (less common)

Fault status

⚠️ Status
Left air intake servo motor circuit short to ground detected (B1286). HVAC intake actuator control circuit fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.0 hours

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