B1426

Code

LAND ROVER B — Body

Right front - climate seat - electric thermal device 1

Brand: LAND ROVER

Type: B — Body

Views: UK: 16 EN: 32 RU: 16

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Page language: EN

Causes

Open or shorted wiring in the right-front seat heater circuit
Damaged/heated seat element (broken filament or excessive resistance)
Poor/corroded connector or pin contact at the seat harness
Faulty seat heater control module or seat ECU
Blown fuse or damaged relay supplying the seat heater
Water ingress or physical damage to the seat pad

Symptoms

Right front seat heater does not operate or only works intermittently
Seat heater indicator may not illuminate for the right front seat
One or more seat heating stages (low/medium/high) unavailable
DTC B1426 stored and may trigger a warning message or limited functionality
Possible burning or electrical smell in severe wiring/short cases

What to check

Read and record stored DTCs and freeze-frame data with a compatible scan tool
Check for other related seat or body control module codes
Visual inspection of right front seat, connectors, and wiring for damage or water
Inspect fuse(s) and relay(s) for the seat heater circuit
Check connector pins for corrosion, bent pins or poor mating
Perform wiggle test on harness while monitoring system operation or live data

Signal parameters

Supply voltage to seat heater: approx. battery voltage (11–14 V) with ignition/accessory on
Heater element resistance: low-ohm value (varies by vehicle; commonly less than 10–20 Ω)
Control module output: switched or PWM feed to heater when selected ON
Circuit continuity between seat heater element terminals and seat ECU ground
Current draw when heater is commanded ON increases (amps dependent on stage)

Diagnostic algorithm

Retrieve codes and freeze frame using diagnostic tool; note any other related codes.
Confirm customer complaint and attempt to operate right front seat heater while monitoring live data.
Visually inspect the right front seat covering, seams and underside for signs of water, damage or foreign objects.
Check fuses and relays for the seat heating circuit; replace if faulty and re-test.
With ignition off, disconnect the seat connector; inspect pins for corrosion, bending or damage. Repair or clean as required.
Measure resistance of the seat heater element across its terminals (bench or in-situ). Compare to manufacturer spec; an open or very high resistance indicates a broken element.
With ignition on, measure supply voltage and ground at the seat heater connector while commanding heater ON; verify the control module is delivering voltage (or PWM) to the element.
If voltage is present but element shows open/high resistance, replace the seat heating element/pad (or seat cushion) or repair wiring as required.
If element resistance is correct but no control voltage is present, diagnose the seat control module output, related fuses/relays, and vehicle network messages to the module; repair or replace module as needed.
After repair, clear codes and perform system check to confirm correct operation under all heater stages and verify no recurrence of DTC.

Likely causes

Broken or high-resistance heating element in the right front seat
Loose/corroded connector or pin at the seat heater harness
Open circuit (broken wire) between seat connector and module
Faulty seat control module output driving the heater
Moisture inside the seat causing short/ground faults

Fault status

⚠️ Status

Right front seat heater circuit fault detected — check seat heater element, connectors, wiring, fuses/relays and seat control module. Repair and verify operation.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

Repair manuals

Manual library for LAND ROVER

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Browse 339 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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B1426 — Right front - climate seat - electric thermal device 1