B2026

Code

LAND ROVER B — Body

Backlight incandescent output - circuit failure

Brand: LAND ROVER

Type: B — Body

Views: UK: 15 EN: 19 RU: 17

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Page language: EN

Causes

Burnt or failed incandescent bulb(s)
Open circuit in wiring (broken wire, disconnected connector)
Short to ground or short to battery in the backlight circuit
Blown fuse or fusible link for lighting/backlight circuit
Corroded or damaged connector/pin at lamp or module
Poor or high-resistance ground

Symptoms

One or more interior or instrument backlights do not illuminate
Backlight may be dim, flicker, or vary with engine speed
Related dash or module warning messages or lamp icons
Multiple lighting circuits affected if fuse or module output has failed

What to check

Read all stored codes and freeze-frame data from all modules
Visually inspect bulbs, lamp holders and associated connectors for damage or corrosion
Check relevant fuses and fusible links for continuity
Inspect wiring harness for signs of chafe, burns, or pinched wires
Check grounds for tightness and corrosion
Confirm whether the fault is present with key-on and engine running

Signal parameters

Nominal supply voltage: ~12 V (key ON/engine OFF) to ~13.5–14.5 V (engine running)
Expected lamp connector voltage to supply side: battery voltage (12 V) when switched ON
Typical incandescent lamp current draw: often 0.1–2 A per lamp depending on lamp rating
If controlled by BCM/PWM, expect a switched ground or PWM waveform; duty cycle varies with dimmer setting
Open-circuit: infinite resistance between lamp terminals; short-to-ground: near 0 Ω to chassis

Diagnostic algorithm

Retrieve all stored and pending codes from all modules; note any related communication or power codes.
Perform a visual inspection of the affected lamp(s), lamp holders, connectors, wiring harness and related fuses for obvious damage or corrosion.
With lamp removed, measure bulb filament continuity with a multimeter. Replace any failed bulbs.
Check fuses and fusible links for the lighting/backlight circuit; replace if blown and investigate cause of fuse failure.
With connector disconnected, measure supply voltage at the lamp power feed with respect to chassis ground (key ON). Verify expected battery voltage is present when the circuit should be on.
Measure resistance from the lamp ground pin to chassis ground to confirm a good ground connection.
If the circuit is PWM/switched by the BCM, use a scope or multimeter to check the output driver for switching/PWM and measure duty cycle with dimmer control changes.
Back-probe the connector and check for short to ground or short to battery by measuring resistance between the feed and chassis ground and between feed and battery positive (with power removed).
Wiggle test wiring and connectors while observing lamp behavior or measuring circuit to locate intermittent wiring faults.
If wiring and bulbs check good, interrogate the BCM/instrument pack: verify power/grounds to module and check for software updates or module faults. Consider module replacement only after wiring and external components are confirmed good.
Clear codes, operate lights through full range (different dimmer settings, ignition states) and confirm no return of the fault.

Likely causes

Failed incandescent lamp or lamps
Loose/disconnected connector at lamp or instrument cluster
Corroded pin or water ingress in connector
Open fuse or fusible link
Short to ground caused by chafed wiring
Faulty output transistor or PWM driver in BCM/instrument pack

Fault status

⚠️ Status

Backlight incandescent output circuit malfunction detected — possible open, short, or abnormal driver signal on the incandescent backlight circuit. Inspection of lamps, wiring, fuses, grounds and module outputs recommended.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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B2026 — Backlight incandescent output - circuit failure