B1031

Code

LAND ROVER B — Body

Left rear seat heater

Brand: LAND ROVER

Type: B — Body

Views: UK: 17 EN: 30 RU: 26

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Page language: EN

Causes

Blown fuse or tripped circuit breaker for seat heaters
Open or shorted heater element in the left rear seat cushion
Faulty seat temperature sensor (thermistor) or incorrect resistance
Faulty seat heater switch or steering wheel/module input
Poor connector pins, corrosion, damaged wiring or broken ground
Faulty seat control/module or body control module (BCM) software/firmware issue

Symptoms

Left rear seat heater does not heat or heats intermittently
Driver information message or seat heater warning lamp illuminated
Uneven heating compared to other seats
Possible increased battery draw if shorted
Associated DTCs for other seat heater circuits or seat modules

What to check

Read stored and pending codes with a capable scan tool; note freeze frame and event data
Visually inspect fuse(s) and seat heater circuit fusebox for blown fuse or damaged links
Inspect underside of left rear seat: connectors, wiring harness, retention clips and signs of corrosion or damage
Operate seat heater switch while watching live data for left rear seat heater status
Check for any occupant detection/seat module codes that may disable heater

Signal parameters

Battery voltage at heater connector with switch ON: ~11–13.5 V (key on/running)
Heater element resistance (seat cushion): typically low — on the order of a few ohms to tens of ohms (measure with element disconnected)
Seat temperature sensor (thermistor) resistance: varies with temperature (expect a measurable, temperature-dependent value, commonly kiloohm-range depending on design)
Heater control output: often PWM from seat module — duty cycle 0–100% (verify with oscilloscope or scope tool)
Current draw for a working seat element: typically a few amperes (measure with in-line ammeter)

Diagnostic algorithm

Verify customer complaint and note conditions when fault occurs; confirm B1031 is current or intermittent
Read all related codes and freeze-frame data — check for other seat/BCM codes
Perform visual inspection: fuses, connectors under left rear seat, seat cushion condition and wiring routing; repair obvious damage
With ignition ON, verify battery voltage at the seat heater power supply pin; if missing, trace back to fuse, relay, or BCM output
Disconnect the left rear seat heater connector and measure heater element resistance. If open or very high, suspect failed element — replace seat heater pad or cushion assembly
Measure seat temperature sensor (thermistor) resistance at ambient and compare to expected behavior (resistance should change with temperature); replace sensor if out of range or open
Backprobe/control module output: check for PWM control signal from seat or body module with the heater switch ON; if no output but control inputs are present, suspect module fault
Perform continuity checks for open/short to ground or battery on harness between seat connector and module; repair wiring or connectors as needed
If heater element measures good but no heat when connected, measure current draw with the circuit powered — low or no current indicates control or supply fault
After repairs, clear codes, run the heater through all settings, and confirm proper operation and that B1031 does not return
If intermittent and wiring and connectors pass, consider replacing seat control module or updating BCM/seat module software per dealer technical service information

Likely causes

Open or high-resistance heater element in the left rear seat
Faulty connector or corroded pin at seat harness/under-seat connector
Blown fuse or poor ground for seat heater circuit
Seat temperature sensor failure

Fault status

⚠️ Status

B1031 — Left Rear Seat Heater circuit fault (open/short/sensor/control). Check fuse, connectors, heater element, temperature sensor and seat control module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

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