B1190

Code

LAND ROVER B — Body

glass door window

Brand: LAND ROVER

Type: B — Body

Views: UK: 19 EN: 27 RU: 23

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Page language: EN

Causes

Failed or seized window regulator or motor
Faulty window switch or touch sensor
Blown fuse or faulty relay in the window power circuit
Damaged wiring, corroded connectors or poor ground at the door harness
Water ingress or mechanical obstruction in the window mechanism
Faulty body control module (BCM) or window control module software/communications

Symptoms

Window will not move up or down or moves intermittently
Slow or noisy window operation; grinding or binding noises
Window stops mid-travel or is misaligned
One-touch/auto up-down not functioning or partial operation
Related warning message or door module fault displayed on diagnostic tool

What to check

Retrieve full DTC list and freeze-frame data with a compatible scan tool
Verify battery voltage is stable (12 V+) during tests
Check fuses and relays for the window circuit and replace or test as needed
Operate window from master and individual switches to isolate switch vs motor
Inspect door wiring harness and connectors for corrosion, pin damage, or water ingress
Listen for motor noise when operation is commanded; note motor response

Signal parameters

Motor supply voltage: ~11–14 V when switch is actuated
Motor current draw: typical 2–15 A depending on vehicle and load; stalled or seized motors draw higher current
Switch signal: logic level change when pressed (consult vehicle manual), often pulled to ground or +12 V
Position sensor/potentiometer: ~0.5–4.5 V sweep for travel-position sensors (if fitted)
CAN bus idle voltage: ~2.5 V on CAN_H and CAN_L differential nominal; LIN bus idle ~0–12 V depending on protocol

Diagnostic algorithm

Connect diagnostic tool, read and record all stored and pending DTCs and freeze-frame data.
Attempt window operation while monitoring live data and observe behavior (from master and door switch).
Inspect fuses/relays for continuity; replace if faulty and retest operation.
Visually inspect door connector and wiring loom for damage, corrosion or chafing; repair as required.
Test switch operation: verify continuity or correct signal to the module when actuated.
Measure motor supply and ground at the motor connector while commanding the window; confirm ~12 V and good ground.
If supply is present but motor does not run, bench-test motor/ regulator assembly off the vehicle to confirm mechanical/electrical failure.
Measure motor current during operation to detect excessive draw (binding) or no draw (open motor).
Inspect and free any mechanical obstructions; check regulator guide rails and glass alignment.
Check BCM/window control module communications and update/calibrate software if dealer-level updates are available.
Clear codes and perform function test and any required auto-relearn or calibration procedures for the window system.
Replace the defective component (switch, motor/regulator, wiring, or module) only after confirming failure with tests, then confirm repair by rechecking for codes and normal operation.

Likely causes

Window motor or regulator failure (most common)
Corroded connector or broken conductor in the door harness
Faulty door/window switch causing intermittent/no operation
Blown fuse or intermittent supply to the motor
CAN or LIN comms fault to the window module (less common)

Fault status

⚠️ Status

Glass door window fault detected — malfunction in window operation, sensing, or communication. Investigation of motor, regulator, switches, wiring and control module recommended.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours

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Repair manuals

Manual library for LAND ROVER

320

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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