B1B54

Code

LAND ROVER B — Body

function LED Rain sensor module sliding roof Front sensor power circuit two sensors

Brand: LAND ROVER

Type: B — Body

Views: UK: 10 EN: 23 RU: 18

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Page language: EN

Causes

Blown fuse or poor fuse contact for the rain/LED sensor power feed
Open, shorted, or damaged wiring harness between the module and front sensor(s)
Corroded, loose or water-intruded connector at the sensor or module
Faulty front rain/LED sensor assembly (internal power circuitry or LEDs)
Faulty module that monitors the sensor power circuit
Poor chassis or battery ground in the sensor circuit

Symptoms

Automatic rain-sensing sliding roof/auto-close feature unavailable or inoperative
Warning or message on dash related to rain sensor or roof system
Illumination LED on sensor not operating or behaving erratically
DTC stored in vehicle control module, possibly accompanied by other related codes
Intermittent operation of sliding roof or rain-sensing features

What to check

Retrieve and record all stored DTCs and freeze-frame data with scan tool
Visually inspect sensor(s), connector(s), and wiring for damage, corrosion, or moisture
Check relevant fuses and fuse holder contacts for continuity and signs of overheating
Check connector seating and pin condition at sensor and control module
Perform simple wiggle test while monitoring live data or lamp to reproduce fault

Signal parameters

Battery/supply voltage at sensor power pin with ignition ON: approximately 11–14 V
Reference/signal voltage where applicable (sensor output): varies with operation; should not be stuck open or shorted to battery
Ground continuity from sensor ground pin to chassis:
Open-circuit condition: infinite/OL on continuity between supply and sensor indicates open wiring
Short-to-ground condition: near 0 ohms between supply and ground indicates short

Diagnostic algorithm

Connect a compatible scan tool, read and note DTCs and freeze-frame data. Confirm B1B54 and any related codes.
Visually inspect the rain/LED sensor(s) and harness (windscreen/A-pillar area) for physical damage, water ingress, or detached connectors. Repair obvious issues.
Check the related fuse(s). Verify continuity and correct voltage at the fuse contact with ignition ON. Replace fuse if blown and investigate cause if it blows again.
With ignition ON, backprobe the sensor power feed pin and measure battery/supply voltage at the sensor connector. If no supply, trace back toward the module/fuse/relay and check wiring and connectors.
Check sensor ground continuity to chassis. Repair high-resistance ground connections.
Inspect and test continuity of the wiring between the control module and sensor pins (power, ground, signal). Repair any open or shorted conductors. Pay attention to chafe points and connector seals.
If power and ground are present and wiring is ok, monitor sensor outputs/signals with scan tool or oscilloscope while wetting the sensor to observe expected changes. If outputs do not change or are abnormal, suspect faulty sensor.
If multiple sensors are used, swap or isolate sensors if possible to determine if the fault follows a sensor or stays on the harness/module side.
If wiring and sensor check good, inspect module connector and pins, and consider replacing the rain sensor module per manufacturer procedure.
After repairs, clear codes, perform self-test routines (if available), and road/test operate the sliding roof/rain-sensing function to confirm repair. Re-scan to ensure code does not return.

Likely causes

Water ingress/corrosion in sensor connector or harness near the windscreen
Broken wire where the harness bends near the A-pillar or sliding roof mechanism
Blown in-line fuse or poor contact at fuse/relay
Intermittent connector due to vibration or improper seating
Failed sensor electronics after impact or prolonged moisture exposure

Fault status

⚠️ Status

Front rain/LED sensor power circuit fault (two-sensor configuration)

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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