How Terrain Response Works
Terrain Response (TR) was introduced on the LR3 in 2005 and has since been refined into Terrain Response 2 on the L405 Range Rover, L462 Discovery 5, and L494 Range Rover Sport. The system uses a rotary dial or touchscreen input to select a terrain mode — General, Grass/Gravel/Snow, Mud/Ruts, Sand, or Rock Crawl on TR1; Auto and additional modes on TR2. Once a mode is selected, the TR ECU sends commands to the transmission module, the center differential, the electronic rear differential (where fitted), the stability control module, and on air suspension vehicles, the ride height controller. The system is genuinely integrated — all these subsystems must communicate correctly for TR to function. A fault in any one of them can trigger a Terrain Response warning.