B1C99

Code

LAND ROVER B — Body

Lamp circuit from the corner right

Brand: LAND ROVER

Type: B — Body

Views: UK: 16 EN: 27 RU: 14

AI status

Completed

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Page language: EN

Causes

Blown or faulty bulb / LED module
Open or short in wiring harness to right corner lamp
Poor or corroded connector/ground
Faulty lamp control module / Body Control Module (BCM)
Water ingress or mechanical damage to lamp assembly
Blown fuse or faulty relay in lamp power feed

Symptoms

Right corner lamp (or associated side marker/cornering lamp) not illuminating
Lamp flickers or works intermittently
Relevant warning on dash (lamp out) or stored DTC
Visible moisture or damage in lamp housing
Other lamps on same circuit may be affected

What to check

Scan vehicle and confirm B1C99 present and freeze frame data
Inspect right corner lamp lens and housing for damage or moisture
Visually check bulb or LED module condition and seating
Inspect wiring and connector for corrosion, damage, or loose pins
Check related fuses and relays
Swap lamp with opposite side (if identical) to check lamp vs wiring

Signal parameters

Supply voltage at lamp connector: approximately battery voltage (~11–14 V) when ON
Ground continuity: near 0 Ω to chassis ground
Bulb filament resistance (typical for incandescent): check service data — commonly 2–30 Ω depending on lamp
LED modules: may be driven by PWM or constant current — verify expected PWM frequency or current per service docs
No-voltage (open) or short-to-ground/short-to-VB should be detected with digital multimeter

Diagnostic algorithm

Verify the code: Clear codes and see if B1C99 returns. Note conditions when code sets (ignition state, lights on, turn signal activation, cornering function).
Visual inspection: Check right corner lamp assembly, lens, mounting, and look for moisture, corrosion, broken sockets or loose bulbs/LED modules.
Lamp swap test: If lamp type is interchangeable, swap the right lamp with the left. If code follows the lamp, replace the lamp unit.
Connector and wiring: Disconnect connector, inspect pins for corrosion/push-back, check for continuity between connector and BCM (or harness splice). Repair any damaged pins or wiring.
Power/ground tests: With lights commanded ON, measure voltage at the lamp power pin. Verify a good ground at the ground pin. No voltage indicates open power feed; no ground indicates grounding issue.
Wiggle test: With a helper activating lamp function, gently manipulate harness and connectors to reproduce intermittent faults.
Check fuses/relays: Confirm appropriate fuses and relays for the lamp circuit are intact and operating.
Module outputs: Using a scan tool, command the lamp ON and monitor BCM output state. If BCM output is commanded but voltage is absent at lamp connector, trace power feed and fuses. If BCM output not commanding, investigate BCM power/ground and network communications.
Repair and retest: Repair wiring, replace lamp or connectors as required, clear codes and confirm repair under the same operating conditions that set the fault.
If wiring and lamp are good but fault persists, consult OEM repair information for BCM driver tests and consider module replacement only after exhaustive proof of failure.

Likely causes

Failed lamp bulb or integrated LED unit
Disconnected or corroded multi-pin connector at lamp
Damaged wiring from chafe, pinch, or rodent
Intermittent ground at lamp housing
Faulty output transistor or driver in BCM
Aftermarket bulb or incorrect lamp fitted

Fault status

⚠️ Status

Right corner lamp circuit fault detected. Check bulb, connector, wiring, fuses and BCM outputs.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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