B103F

Code

LAND ROVER B — Body

Control of the rear seat heater

Brand: LAND ROVER

Type: B — Body

Views: UK: 25 EN: 29 RU: 21

AI status

Completed

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Completed 100%

Page language: EN

Causes

Blown fuse or faulty relay for rear seat heater
Open or shorted wiring in seat heater circuit
Faulty seat heating element (broken filament or short)
Faulty seat temperature/occupancy sensor
Poor connector contacts or corrosion at seat/ECU connectors
Body control module (BCM) or seat module software/hardware fault

Symptoms

Rear seat heater not working or only working intermittently
Seat heater indicator (switch/cluster) not illuminating or indicates fault
Reduced or no heat from rear seat when activated
DTC B103F stored in body/control module and may set related warnings
Possible other body modules reporting seat-related communication errors

What to check

Read stored and pending DTCs and freeze-frame data with a factory-level scan tool
Verify correct fuse(s) and relays for rear seat heater are present and good
Inspect seat connector(s) and wiring for damage, corrosion, or loose pins
Operate rear seat heater switches while monitoring supply and ground voltages
Check for CAN/LIN communication errors related to seat module or BCM

Signal parameters

Supply voltage to seat heater circuit (12 V nominal)
Ground continuity for rear seat heater circuit
Seat heating element resistance (ohms) across heater pads
Seat temperature sensor voltage/resistance
Control module output command (PWM/duty cycle or relay control) to heater
CAN/LIN message presence and signal for seat module

Diagnostic algorithm

Connect a compatible diagnostic scanner, read DTCs and freeze-frame; note any related codes (CAN/seat module/BCM).
Verify supply fuse(s) and seat heater relay are intact; replace if blown and retest.
With ignition on, probe power feed and ground at the seat connector while operating the switch; confirm 12 V supply and good chassis ground.
Measure the resistance of the heating element in the rear seat pad(s); compare to specification or check for open/short circuits.
Inspect and wiggle wiring harness and connectors while watching live data for intermittent changes; repair any damaged wiring or corroded contacts.
Check seat temperature/occupancy sensor readings on the scan tool; replace sensor if out of range or inconsistent.
Verify control module outputs (relay control or PWM) when heater is commanded on; if module does not command, check module power/ground and communications.
Check CAN/LIN bus integrity if communications errors present; repair bus faults or remove/replace faulty modules as required.
If wiring, sensors and power/ground are good but fault persists, consider replacement or reflash of the seat control module/BCM per manufacturer guidance.
After repairs, clear codes and perform a functional test; monitor for return of B103F or related codes.

Likely causes

Blown fuse or poor power/ground to the rear seat heater
Open/shorted wiring or damaged connector in seat harness
Failed seat heating element or seat pad wiring
Faulty seat module or BCM controlling the heater

Fault status

⚠️ Status

Stored (confirmed) or intermittent fault detected for rear seat heater control. Module has logged an error requiring inspection of power/ground, wiring, heater element, sensor or communications. May be present as active, pending or permanent depending on vehicle history.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2 hours

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