B113A

Code

LAND ROVER B — Body

General failure in the lumbar of the seat

Brand: LAND ROVER

Type: B — Body

Views: UK: 32 EN: 40 RU: 33

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Page language: EN

Causes

Failed lumbar motor or actuator
Damaged or disconnected wiring or connector to the lumbar motor
Faulty seat position/adjustment switch or control unit
Blown fuse or poor power/ground at the seat
Faulty seat control module (SCM) or software issue
Mechanical binding or obstruction in the lumbar mechanism

Symptoms

Lumbar adjustment does not operate or works intermittently
Unusual noise from the seat when attempting lumbar movement
Seat adjustment functions otherwise normal (or other functions may also be affected)
Fault indicator or stored fault in vehicle diagnostic system

What to check

Read and record stored DTCs and freeze-frame data from the vehicle using a diagnostic tool
Inspect lumbar motor connector and wiring for damage, corrosion, or disconnection
Check seat fuses and circuit breakers related to seat motors
Operate lumbar switch while monitoring for motor movement and listening for unusual noises
Perform voltage and ground checks at the lumbar motor connector with the switch operated
Scan for related seat module errors or communication faults on the vehicle network

Signal parameters

Battery/supply voltage present at lumbar motor feed when switch is operated (~vehicle battery voltage)
Ground continuity from motor negative terminal to chassis/seat module ground
Motor actuation command from seat control module (voltage change or PWM) when switch pressed
Current draw at motor during operation (should rise when motor runs; abnormally high suggests binding or short)
Resistance/continuity across motor terminals with power removed (open = motor fault)

Diagnostic algorithm

Connect a diagnostic scanner, read DTCs and note any related codes, clear and attempt to re-run the fault to capture conditions.
Visually inspect seat upholstery area and underside of seat for damaged wiring, pinched cables, or disconnected connectors near the lumbar motor.
Verify relevant fuses and seat power supplies. With key on, check for battery voltage at the lumbar motor power pin while operating the lumbar switch.
Check ground at the motor connector for continuity to chassis and seat module ground.
With power disconnected, measure resistance of the lumbar motor. An open circuit indicates a failed motor; very low resistance or burnt smell indicates internal short.
If motor supply and ground are present but motor does not run, command the motor from a diagnostic tool (if supported) to isolate switch vs module fault.
Measure current draw during motor operation. High current with no movement suggests mechanical binding, low/no current suggests open circuit or loss of supply/command.
Wiggle test wiring and connectors while operating to reproduce intermittent faults; repair any damaged wiring or corroded connectors.
If wiring and motor test good, investigate seat control module operation, check for software updates or re-calibration procedures as specified by manufacturer.
After repair, clear DTCs and verify proper lumbar operation and that the fault does not reappear.

Likely causes

Open or corroded connector at the lumbar motor
Motor seized or worn out (no movement or excessive current draw)
Intermittent supply voltage or poor ground from seat module
Faulty lumbar switch sending incorrect commands
Seat module internal fault or missing calibration

Fault status

⚠️ Status

B113A — General lumbar failure: Seat control module has detected a fault in the lumbar adjustment circuit. Possible causes include motor failure, wiring/connector fault, defective switch, blown fuse, mechanical binding, or seat module fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Browse 413 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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