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Home / DTC / B1428 — Front right - Seat climate module - Climate control module of fan 1

B1428 — Front right - Seat climate module - Climate control module of fan 1

Detailed page for trouble code B1428.

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Code

B1428

LAND ROVER B — Body

Front right - Seat climate module - Climate control module of fan 1

Brand: LAND ROVER
Type: B — Body
Views: UK: 8 EN: 12 RU: 9
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Page language: EN

Causes

  • Open or shorted wiring between climate control module and seat climate module
  • Faulty front-right seat climate module (internal electronics or driver for fan 1)
  • Failed seat ventilation blower (fan motor) or excessive mechanical load
  • Corroded or loose connector/pins at the seat module or HVAC harness
  • Blown fuse or poor power/ground connection to the seat module
  • Loss of CAN/LIN communication or software/configuration issue

Symptoms

  • Front-right seat ventilation (fan) does not operate or has reduced airflow
  • Intermittent or permanent loss of seat cooling on the front-right seat
  • HVAC or seat module warning/message on the instrument cluster or infotainment
  • Unusual noise from the seat area when ventilation is commanded
  • DTC B1428 stored and possibly accompanied by related communication codes

What to check

  • Read and record freeze-frame data and all related DTCs using a diagnostic tool
  • Visually inspect seat connectors, harness, and module for corrosion, water damage or physical damage
  • Check fuses and relays supplying the seat climate module
  • Verify battery voltage at the seat module power pin with key ON and fan commanded
  • Check module ground integrity (voltage drop or continuity to chassis)
  • Confirm presence of control signal (PWM or command) from the climate control unit and CAN/LIN messages

Signal parameters

  • Power supply: approx. battery voltage at module power input with key ON (typically ~11–14 V)
  • Ground:
  • Control input: variable duty-cycle PWM or digital command from seating/climate control; duty cycle 0–100% when commanded
  • Fan motor resistance: low ohms (motor-specific) — expect low to moderate resistance; open circuit indicates failed motor
  • Fan current draw: varies by motor and speed (typically hundreds of mA to a few amps); significantly higher current suggests motor binding or short
  • CAN/LIN: module should appear on vehicle bus; communication messages present when key ON

Diagnostic algorithm

  1. Connect a diagnostic scanner; read and note DTC B1428 and any related codes; check freeze-frame and occurrence count.
  2. Attempt an active test: command front-right seat fan 1 ON via diagnostic tool and observe response (fan movement, current draw, noise).
  3. Visually inspect the front-right seat connector and harness for corrosion, bent pins or water ingress; reseat connector.
  4. Inspect and test relevant fuses/relays. Replace any blown fuses and retest.
  5. With key ON and fan commanded, measure battery voltage at the module power terminal and verify a solid ground at the module ground terminal.
  6. Probe the control pin for a PWM signal or command when the fan is commanded; if no control signal, trace back to climate control/BCM/CAN node.
  7. Measure resistance of the seat fan motor (disconnect motor from module). An open circuit indicates failed motor; very low or shorted reading indicates internal short.
  8. Measure current draw of the motor while commanded. Excessive current can indicate binding or electrical short; no current indicates open circuit or lack of supply.
  9. Check CAN/LIN communication to ensure the seat climate module is visible and not reporting bus errors; inspect wiring and connectors for bus faults.
  10. If wiring, power and grounds are good but fault persists, consider module replacement or software update per manufacturer procedure. After repairs, clear codes and retest system operation.

Likely causes

  • Corroded/loose connector at the front-right seat climate module
  • No power or bad ground to the seat climate module (fuse, harness)
  • Faulty seat ventilation fan motor (motor stall or high current draw)
  • Defective seat climate module fan driver for fan 1
  • Intermittent CAN/LIN communication fault between control units

Fault status

⚠️ Status
Front-right seat climate module — fan 1 electrical or communication fault. May cause no or reduced seat ventilation for the front-right seat.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

B1427 B1429 B1410 U0121 U0231
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