B2143

Code

LAND ROVER B — Body

Non-volatile memory failure Driver's seat switch failure of the driver

Brand: LAND ROVER

Type: B — Body

Views: UK: 27 EN: 45 RU: 28

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Page language: EN

Causes

Failed or corrupted non-volatile memory in the seat control module
Faulty/dirty/intermittent driver seat switch or selector
Open/shorted wiring or poor connector pin contact at the seat switch or seat module
Low battery voltage or voltage supply interruptions during module write operations
Water ingress/corrosion in the seat switch, connectors, or module
Software/firmware fault in seat control module or related modules

Symptoms

Seat memory presets not working or not storing positions
Driver seat switch(s) unresponsive or only intermittently operative
Seat may not move or may move unpredictably when switch is operated
Steering column/seat linked memory features fail
Related DTC(s) stored; possible interior warning/message on dash
Possible loss of other seat features (heating, lumbar) if controlled by same module

What to check

Read all related DTCs and freeze frame data with an appropriate diagnostic tool
Check battery and charging system voltage (stable ~12–14.5 V) before/while diagnosing
Visually inspect seat switch, seat module and connectors for corrosion, water, damage
Check fuses and relays that supply seat circuits
Check wiring continuity and for short to ground/power at seat switch and module
Verify CAN/bus communications to the seat module with a scan tool

Signal parameters

Supply voltage to seat module: nominal 12 V (engine off) to 14.4 V (engine running)
Switch reference/signal: typically 0–5 V or discrete ground-signal type depending on design
Switch/contact resistance: near 0 Ω when closed; open circuit when released (varies by switch type)
CAN bus idle voltages ~2.5 V on CAN_H/CAN_L (verify with oscilloscope/scan tool)
No. of NVM write/read errors or module internal status flags visible via diagnostic tool

Diagnostic algorithm

Connect a capable diagnostic scanner. Record B2143 and any related codes (seat, BCM, CAN). Note freeze frame and occurrence count.
Verify battery voltage stable and above 12 V. Recharge or connect battery maintainer if low.
Visually inspect driver's seat switch, harness and seat control module connectors for corrosion, pulled pins or water damage. Repair as needed.
Check fuses/power to seat module. Probe power and ground pins at the module connector for good supply and chassis ground continuity.
With ignition on, monitor live data for the driver's seat switch inputs while operating the switches. If inputs do not change, suspect switch or wiring.
Back-probe switch connector and measure continuity/resistance while actuating each function. Replace switch if contacts fail.
Check for stored NVM or internal module errors via dealer-level diagnostic functions. Attempt to clear code and operate memory function; retest for recurrence.
If module software update or NVM re-learn procedure is available from factory service information, perform as instructed. Re-run diagnostics after reprogramming.
If wiring, switch and reprogramming are good but fault persists, bench-test or replace the seat control module (observe safety and radio/airbag programming cautions).
After repair, clear codes and verify full seat switch and memory function over multiple ignition cycles; road test if required.

Likely causes

Corroded connector at the driver's seat switch or seat module
Faulty driver's seat switch (mechanical or electrical failure)
Seat module NVM corruption after a battery loss or failed update
Intermittent power/ground to the seat module

Fault status

⚠️ Status

Stored fault: Non-volatile memory failure — Driver's seat switch. Seat control module reports NVM corruption or driver switch circuit failure; memory and/or switch functions may be inoperative.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours

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B2143 — Non-volatile memory failure Driver's seat switch failure of the driver