Home >> Land Rover >> 2021 >> Defender 90 S >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Trailer Control Module (TRM) -- Defender/L663 >> Diagnostic Trouble Code Index - DTC: Trailer Control Module (TRM) (G2445144) >> Description And Operation >> Trailer Control Module (TRM) >> DTC B1D09-53: Left Trailer Direction Indicator - Deactivated >> Possible Causes