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Home / DTC / B13FA — Left rear - Seat massage module, assembly of rear support

B13FA — Left rear - Seat massage module, assembly of rear support

Detailed page for trouble code B13FA.

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Code

B13FA

LAND ROVER B — Body

Left rear - Seat massage module, assembly of rear support

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring to the left rear seat massage module
  • Poor connector contact or corrosion at the seat harness connector
  • Blown fuse or lost power feed to the seat module
  • Faulty left rear seat massage module (internal electronics or motor drivers)
  • Mechanical jam or seized massage actuator/motor inside the seat
  • Loss of CAN/LIN communication between the seat module and vehicle control modules

Symptoms

  • Left rear seat massage function inoperative or intermittent
  • Warning message in infotainment or seat settings (e.g., 'Seat service required')
  • Stored B13FA DTC (may appear with other seat or network codes)
  • Noise or no movement from massage actuator when selection attempted
  • Possible loss of other seat functions if module shares power/ground

What to check

  • Read DTCs and freeze frame data with a capable scan tool; save for reference
  • Check for additional related DTCs (other seat modules, CAN/LIN communications)
  • Visual inspection of left rear seat wiring harness and connector for damage, corrosion or water intrusion
  • Verify fuses/relays related to rear seats and instrumented power circuits
  • Inspect seat plug retention, pin damage, or bent pins
  • Attempt to operate the massage function while observing connector and harness for movement (wiggle test) and listen for actuator

Signal parameters

  • Module battery supply voltage: approx. 12V (key ON/engine running as specified)
  • Module wake/switch feed voltage (ignition/accessory)
  • Ground continuity:
  • CAN or LIN bus signals present on seat module data lines (correct idle voltages and activity)
  • Actuator/motor current draw during operation (compare to spec)
  • Actuator/motor resistance/impedance (ohms) when disconnected

Diagnostic algorithm

  1. Connect a diagnostic scanner and record B13FA plus any related codes and freeze frame data.
  2. Clear codes, then attempt to reproduce the fault by operating the left rear massage function. Note whether code returns and any behavior.
  3. Visually inspect the left rear seat harness, connectors, and seat module for damage, moisture, or loose pins. Repair any obvious damage.
  4. Check relevant fuses and relays for seat power; verify 12 V supply at the seat module connector with ignition ON and when massage is selected.
  5. Verify a solid ground at the module ground pin (measure resistance to chassis ground).
  6. Check communication lines (CAN/LIN) at the module for proper bus voltages and activity with a scanner or oscilloscope. Look for other modules reporting communication errors.
  7. With connector attached, operate massage function and observe voltage/current to actuator. Listen for motor noise; if there is no motor current but supply present, suspect internal module failure.
  8. If actuator appears mechanically jammed, remove seat trim as required and inspect actuators/mechanisms. Measure motor resistance and attempt direct bench test if accessible.
  9. If wiring, power and communication are good and actuator is functional, reprogram/reflash or replace the left rear seat massage module per manufacturer procedures.
  10. After repair, clear codes and verify proper operation through a full function check and road test if required.

Likely causes

  • Damaged/loose connector at left rear seat harness
  • Loss of power or blown fuse to the seat module
  • Faulty seat massage module (module electronics or actuator motor)
  • Communication fault on CAN or LIN bus to the seat module
  • Mechanically jammed massage actuator

Fault status

⚠️ Status
Left rear seat massage module fault detected — massage function disabled. Service required to restore operation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B13F9 B13FB B13F0 U0140 U0121
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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