B1D13

Code

LAND ROVER B — Body

Indoor lamps 1 circuit

Brand: LAND ROVER

Type: B — Body

Views: UK: 10 EN: 22 RU: 13

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Page language: EN

Causes

Blown fuse for interior lamps circuit
Failed interior lamp (bulb or LED module)
Open or shorted wiring between BCM and lamps
Corroded or loose connector at lamp or BCM
Faulty switch or dimmer module
BCM output driver fault or software issue

Symptoms

One or more interior lamps do not illuminate
Interior lamps flicker or cycle on/off intermittently
Interior lamps stuck on or do not respond to switches
Battery drain with vehicle off if lamp stuck on
Related dash messages or stored BCM faults

What to check

Scan vehicle with a capable diagnostic tool; read and record all BCM codes and freeze frame data
Check interior lamp fuse(s) for continuity and proper rating
Visually inspect lamp assemblies, sockets and connectors for corrosion, damage or water ingress
Operate lamp switch(s) while observing lamp behavior and scanning live data
Measure supply voltage at lamp connector with switch ON and OFF
Check ground continuity from lamp ground to vehicle chassis/BCM

Signal parameters

Lamp supply voltage: ~12 V with lamp switch ON, ~0 V (or battery voltage through switch open depending on design) with OFF
Ground: near 0 V relative to chassis when measured at connector
Continuity: low resistance circuit expected between lamp and BCM (
Current: incandescent lamps typically draw hundreds of milliamps; LED modules draw much less (tens to low hundreds mA)
BCM output switching may be saturated or PWM for dimming — waveform present when dimmer active

Diagnostic algorithm

Retrieve freeze frame and full fault list with diagnostic scanner. Note any related codes or network communication errors.
Perform a visual inspection of lamps, sockets, connectors and fuse(s). Replace blown fuses only after verifying cause.
With ignition ON, measure battery voltage at lamp supply pin at the connector while operating the interior lamp switch/dimmer. Confirm voltage changes as expected.
Measure voltage at lamp ground pin and check continuity to chassis ground; repair any high-resistance grounds.
If supply and ground are correct but lamp does not illuminate, remove lamp and bench-test the lamp module or bulb (replace if faulty).
If lamp still not powered, perform continuity check from BCM pin to lamp connector; wiggle harness in suspect areas (door hinges, roof liner) to see if fault is intermittent.
If wiring and lamp are good, test BCM output using an oscilloscope or multimeter (observe PWM if dimming). Compare to specification. Consider swapping known-good BCM connector outputs if available and supported.
Repair or replace faulty wiring, connectors or lamp module as required. Clear codes and re-test function and for return of fault after multiple cycles.
If fault persists and wiring/lamp are confirmed good, consult vehicle-specific service information for BCM diagnostic procedures and consider BCM reprogramming or replacement following proper module programming steps.

Likely causes

Blown fuse or poor fuse contact
Failed lamp (burned filament or failed LED module)
Loose/corroded connector at lamp or ground
Broken/open wire in harness near door hinge or lamp
BCM driver fault (less common)

Fault status

⚠️ Status

Indoor lamps 1 circuit fault detected — electrical issue (open/short/high resistance) in the interior lamp circuit.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours

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LAND ROVER

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