Home >> Land Rover >> 2021 >> Range Rover SVAutobiography Dynamic Blk. >> Repair and Diagnosis >> Quick Lookups >> Common Specs & Procedures >> Diagnostic Trouble Code Index DTC: Seat Module - Rear - Left (RLSM)/Right (RRSM) -- Range Rover/L405 >> General Information >> Description And Operation >> Diagnostic Trouble Code Index - DTC: Seat Module - Rear - Left (RLSM)/Right (RRSM) (G2409277) >> DTC B154A-87: Rear Seat Massage Module - Missing message >> Possible Causes