Land Rover B1d1787 |top| -

Reinstall original OEM module or a known-compatible brand (e.g., Philips Ultinon or Sylvania Zevo).

This is almost always a issue, meaning the wire carrying the turn signal power is unintentionally touching a wire that carries constant battery power (12V+). land rover b1d1787

Your Land Rover monitors every bulb and LED array for resistance and voltage. When you activate the left turn signal, the Body Control Module (BCM) or Central Junction Box (CJB) sends power to that circuit. The code B1D1787 triggers when the computer detects (usually above 16V) on the left front turn signal circuit. Reinstall original OEM module or a known-compatible brand (e