B1A74

Code

LAND ROVER B — Body

Right seat heater

Brand: LAND ROVER

Type: B — Body

Views: UK: 11 EN: 18 RU: 12

AI status

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Page language: EN

Causes

Open or short in right seat heater element
Damaged or corroded wiring or connector under the seat
Poor ground or blown fuse / faulty relay
Faulty seat temperature (thermistor) sensor
Seat control module / heater control unit failure
Water ingress or mechanical damage to the seat assembly

Symptoms

Right seat heater does not heat or heats intermittently
Driver information message or seat heater warning lamp present
Heater cycles rapidly or remains at a single setting
Related comfort features may show errors or reduced functionality

What to check

Read and record all stored DTCs and freeze frame data; check for related codes
Check for available technical service bulletins or software updates
Visually inspect fuses and relays for the seat heater circuit
Inspect connectors and wiring under the right seat for corrosion, pin damage, loose mates, or rodent damage
Check for signs of water ingress or physical damage to the seat cushion/cover
Confirm module communications on vehicle network (CAN) and check related modules

Signal parameters

Battery/supply voltage to seat heater circuit with ignition on: ~11–14 V expected
Heater element DC resistance (approximate, vehicle dependent): typically low ohms (roughly 0.5–5 Ω); open circuit indicates failed element
Seat temperature sensor (NTC) resistance at ~25 °C: typically in the kΩ range (vehicle dependent); verify against service data
Expected heater current draw when on: commonly 1–10 A depending on seat design
Control signal may be PWM from module: 0–100% duty at low Hz (refer to workshop data for exact frequency)

Diagnostic algorithm

Record freeze frame and all DTCs, then clear codes and attempt to re-run to confirm persistent fault
Consult manufacturer service data and TSBs for model-specific procedures and expected values
Visually inspect fuse(s) and relay(s) for the seat heater and replace if faulty
With ignition off, disconnect seat connector, inspect pins for corrosion, bent pins or damage; repair as needed
Measure resistance of the right seat heater element between its harness pins with connector disconnected. An open circuit or very high resistance suggests a failed element
Measure seat temperature sensor (NTC) resistance at ambient and compare to service values; if out of range, replace sensor
With harness connected and ignition on, verify supply voltage and ground at the seat heater connector; perform voltage drop checks while heater is commanded on
If possible, command the heater on via diagnostic tool and monitor current draw and PWM signal from the module
Repair or replace damaged wiring, connector, heater mat, sensor or seat control module as indicated by tests
After repairs, clear codes, perform any required module refresh/relearn procedures, and verify operation and that the code does not return

Likely causes

Open or high-resistance heater element due to damage or wear
Corroded/loose connector at the seat module or heater harness (common under seat)
Blown fuse or poor ground connection
Faulty seat temperature sensor (NTC) causing incorrect feedback

Fault status

⚠️ Status

Right seat heater circuit fault detected. Heater may not operate correctly; inspection of wiring, connectors, sensor and seat heater element recommended.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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