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Home / DTC / B13FB — Left rear - Seat switch input massage

B13FB — Left rear - Seat switch input massage

Detailed page for trouble code B13FB.

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Code

B13FB

LAND ROVER B — Body

Left rear - Seat switch input massage

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

Causes

  • Faulty left rear seat massage switch
  • Open, short to ground, or short to battery in switch wiring or connector
  • Poor connector contact or corrosion at seat harness connector
  • Water/moisture ingress in the seat or connector
  • Faulty seat control module or internal input circuit
  • Software/firmware issue or configuration error

Symptoms

  • Left rear seat massage function inoperative or intermittent
  • Possible warning message or icon for seat systems on instrument cluster
  • Massage switch does not respond or behaves erratically
  • Other seat features on the same module may be affected

What to check

  • Read and record all stored and pending codes; check freeze/frame data
  • Check for related codes (other seat switches or seat module faults)
  • Visually inspect the left rear seat, connectors and wiring harness for damage, corrosion or water
  • Perform a wiggle test while monitoring the code or live data to reproduce the fault
  • Check fuses and power/ground to the seat control module
  • Consult manufacturer service information and any technical service bulletins

Signal parameters

  • Seat switch is a low-voltage logic input referenced to vehicle battery/ground (typical input voltage within module logic range)
  • Expected behavior: defined binary state (closed/active vs open/inactive) when switch pressed/released
  • Continuity: switch closed should show low resistance (near 0 ohms) between switch terminals; open should show high resistance
  • No short to battery or ground on the switch wiring when circuit is inactive

Diagnostic algorithm

  1. Verify the customer concern and attempt to reproduce the symptom. Note when the fault occurs (after seat movement, moisture exposure, etc.).
  2. Retrieve and record all related DTCs and live data from the seat control module; clear codes and see if code returns.
  3. Visually inspect the left rear seat area, connectors (under the seat), and harness for signs of damage, corrosion, or water ingress. Pay attention to wiring routed through the seat base and hinge points.
  4. With ignition ON, backprobe the switch connector and measure the signal while operating the massage switch. Confirm the input changes state when the switch is pressed/released.
  5. Check continuity between the switch and the seat control module connector. Inspect for shorts to ground or battery by measuring resistance to ground and to battery voltage with circuit inactive.
  6. Wiggle harness and move seat through full travel while observing the signal or scanning tool to identify intermittent faults caused by broken wires.
  7. If signal and wiring check OK, verify power and ground at the seat control module. If power/ground are good, check for proper communication (CAN/LIN) if applicable.
  8. If available, swap in a known-good switch or seat module (per manufacturer guidance) to isolate component failure.
  9. Repair or replace damaged wiring, connector, or switch as required. Use manufacturer-approved parts and secure routing to prevent future chafing.
  10. After repairs, clear codes, verify proper operation of the massage function and perform a road/usage test to confirm the fault does not return.
  11. Safety note: Follow manufacturer procedures for disabling the battery and SRS systems before removing seats or disconnecting connectors near airbags.

Likely causes

  • Damaged or contaminated connector at the left rear seat switch
  • Open/short in the seat switch harness caused by seat movement
  • Failed massage switch (mechanical/electrical)
  • Seat control module input failure

Fault status

⚠️ Status
Left rear seat massage switch input circuit fault detected (open/short/intermittent) reported to seat control module.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

Similar codes

B13F8 B13F9 B13FA B13FC B13FD
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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