B2085

Code

LAND ROVER B — Body

Driver seat module internal fault

Brand: LAND ROVER

Type: B — Body

Views: UK: 20 EN: 30 RU: 17

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Page language: EN

Causes

Internal failure of the driver seat control module electronics
Low or intermittent power supply to the seat module (blown fuse, loose connection, poor battery)
Poor ground or high-resistance ground connection
Corroded or damaged connector or wiring harness between module and vehicle power/CAN
Water ingress or physical damage to the seat module or wiring
Software corruption or failed module programming/flash

Symptoms

Seat adjustment functions inoperative or intermittent (fore/aft, recline, lumbar)
Seat memory or heating/lumbar features not available
Steering/seat memory not recalling positions (if equipped)
Warning message or lamp indicating seat service required or module fault
Occasional loss of communication with seat-related systems (e.g., memory, occupant sensors)

What to check

Use a manufacturer-level scan tool to read and log B2085 and any related codes; check freeze frame/occurrence data
Attempt to clear the code and see if it returns immediately or after operation
Visually inspect the driver seat area, connectors under the seat, and wiring harness for damage, corrosion, or water intrusion
Check fuses and relays related to seat power circuits
Measure battery voltage with ignition on and cranking; verify 12V feed to the seat module power pin
Verify ground continuity from module ground pin(s) to chassis (low resistance)

Signal parameters

Module supply voltage (key on): ~11–14.5 V at module power pin
Module ground: continuity to chassis, typical resistance
CAN bus idle level: approx. 2.5 V on CAN High and CAN Low (recessive state) — verify differential signaling with scope or CAN tester
CAN communication: module should send/receive messages when ignition awake — check with diagnostic tool for module alive messages
Resistance/continuity of motor circuits: within manufacturer specification (check service manual)

Diagnostic algorithm

Connect a compatible diagnostic scanner and read current and stored codes. Record freeze-frame data and any related seat or CAN codes.
Attempt to clear B2085; cycle ignition and attempt seat operations to see if code returns immediately or intermittently.
Inspect under-seat connectors and harness for corrosion, deformation, broken wires, or water damage. Repair or reseal as required.
Check fuses/relays supplying seat module power. Verify presence of ignition-switched 12 V at the module power pin with a meter.
Verify ground(s) from module to chassis. Clean and tighten ground connections if resistance is high.
Verify CAN bus connectivity: inspect connectors, measure idle voltages, check termination resistances (~60 Ω total), and confirm other modules communicate on the same network.
If power, ground, and CAN are good, consult service manual for module-specific tests (pin-out, actuator/motor tests) and perform bench tests where specified.
Check for available software updates/TSBs. If module software is corrupted, reflash or reprogram per factory procedure.
If internal module failure is confirmed after electrical and communication checks, replace the driver seat module with a genuine or OEM-equivalent unit and program/configure to vehicle per manufacturer procedure.
After repairs, clear codes and perform full functional test of seat operations and verify no return of B2085.

Likely causes

Failed/defective driver seat control module
Poor ground or intermittent 12V feed to module
Corroded/damaged connector at the seat module (moisture or abrasion)
CAN bus communication fault preventing normal module operation
Module software corruption after battery disconnect or failed update

Fault status

⚠️ Status

B2085 — Driver Seat Module: internal fault detected. Inspect seat module, wiring, and communication. Service required.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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B2085 — Driver seat module internal fault