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Home / DTC / B122E — Cushion of the right seat

B122E — Cushion of the right seat

Detailed page for trouble code B122E.

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Code

B122E

LAND ROVER B — Body

Cushion of the right seat

Brand: LAND ROVER
Type: B — Body
Views: UK: 1 EN: 7 RU: 3
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Page language: EN

Causes

  • Damaged or corroded connector under right front seat
  • Open, short or high-resistance wiring in the cushion sensor/heater circuit
  • Faulty right seat cushion module or occupant detection sensor
  • Water/moisture ingress into seat cushion or connector
  • Software/configuration error in vehicle network or seat control module
  • Faulty body control module (BCM) or seat control ECU

Symptoms

  • Seat heater for right seat inoperative or intermittent
  • Passenger/occupant-detection warnings or incorrect seatbelt reminder behaviour
  • Airbag/Occupant Classification System (OCS) warning light or message
  • Related seat memory or power adjustment functions not working
  • Stored fault code B122E and possibly other seat/airbag related DTCs

What to check

  • Read stored codes and freeze-frame data with a diagnostic scanner; note any related DTCs (SRS, BCM, CAN).
  • Visually inspect right seat underside: connectors, wiring harness routing, clips, and signs of moisture or damage.
  • Check for corrosion or bent pins on the multi-pin connector at the seat base; disconnect and inspect contacts.
  • Attempt to reproduce fault while observing live data from seat module/OCS (occupancy, cushion sensor values, heater status).
  • Perform wiggle test on seat harness while watching live data to find intermittent opens/shorts.
  • Check vehicle fuses and relays feeding seat circuits.

Signal parameters

  • 12 V supply present at seat module/connector with ignition on (measure at pin)
  • Ground continuity from seat module shell/ground pin to chassis ground
  • CAN / LIN messages present for seat module on vehicle network (no bus errors)
  • Occupant/cushion sensor shows variable data in live stream (not always fixed open/short)
  • Heater element shows measurable continuity/resistance (refer to vehicle service spec)

Diagnostic algorithm

  1. Connect a capable diagnostic tool, read and record all seat, BCM and SRS codes and live data. Note freeze-frame conditions.
  2. Visually inspect connectors, wiring and seat pad for damage or moisture. Repair corrosion and dry area if required.
  3. With battery voltage stable, probe the seat connector: verify +12 V supply, ground, and communication lines; record readings.
  4. Monitor live occupant sensor and heater status while performing a wiggle test of the harness and moving the seat through its travel to find intermittent faults.
  5. Measure resistance/continuity of the cushion heater and occupant sensor leads (compare to service values). Isolate open or short circuits.
  6. If wiring and connectors are good but sensors or heater element are out of spec, remove seat trim and test/replace the cushion sensor/heater pad per service procedure.
  7. If seat module shows no power or communications while wiring is good, test or reprogram/replace the seat control module or BCM as directed by manufacturer diagnostics.
  8. After repair, clear codes and verify repair with road/in-vehicle checks and by rechecking live data and DTC memory.
  9. Safety note: when working near occupant sensors or SRS wiring, follow vehicle manufacturer procedures for disabling the SRS/airbag system and use proper static/electrostatic precautions.

Likely causes

  • Loose or corroded multi-pin connector at seat base
  • Open or shorted heater/occupant sensor element in cushion
  • Seat control module internal fault
  • Moisture damaged wiring or sensor in cushion pad

Fault status

⚠️ Status
Right seat cushion circuit fault detected — fault in cushion sensor/heater or seat module/connector. May affect occupant detection and seat-related functions. Diagnostic inspection and repair of wiring, connectors, seat cushion components or seat control module required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-3 hours

Similar codes

B122A B122B B122C B122D B122F
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