diff --git a/src/saic_ismart_client_ng/api/vehicle/climate/__init__.py b/src/saic_ismart_client_ng/api/vehicle/climate/__init__.py
index a03fdeb..86adfda 100644
--- a/src/saic_ismart_client_ng/api/vehicle/climate/__init__.py
+++ b/src/saic_ismart_client_ng/api/vehicle/climate/__init__.py
@@ -81,10 +81,10 @@ async def control_heated_seats(
     ) -> VehicleControlResp:
         rcv_params = [
             RvcParams(
-                RvcParamsId.HEATED_SEAT_DRIVER, left_side_level.to_bytes(1, "big")
+                RvcParamsId.HEATED_SEAT_FRONT_LEFT, left_side_level.to_bytes(1, "big")
             ),
             RvcParams(
-                RvcParamsId.HEATED_SEAT_PASSENGER, right_side_level.to_bytes(1, "big")
+                RvcParamsId.HEATED_SEAT_FRONT_RIGHT, right_side_level.to_bytes(1, "big")
             ),
             RvcParams(RvcParamsId.PARAMS_MAX, b"\x00\x00\x00\x00"),
         ]
diff --git a/src/saic_ismart_client_ng/api/vehicle/climate/schema.py b/src/saic_ismart_client_ng/api/vehicle/climate/schema.py
index 86be7bf..daf46b7 100644
--- a/src/saic_ismart_client_ng/api/vehicle/climate/schema.py
+++ b/src/saic_ismart_client_ng/api/vehicle/climate/schema.py
@@ -6,10 +6,15 @@
 
 
 class HeatedSeat(Enum):
-    """A single heated seat, by the parameter the iSmart app uses for it."""
+    """A single heated seat, by the parameter the iSmart app uses for it.
 
-    FRONT_LEFT = RvcParamsId.HEATED_SEAT_DRIVER
-    FRONT_RIGHT = RvcParamsId.HEATED_SEAT_PASSENGER
+    Left and right are the physical sides of the car, the same on left- and
+    right-hand drive cars. They match ``frontLeftSeatHeatLevel`` /
+    ``frontRightSeatHeatLevel`` in the vehicle status.
+    """
+
+    FRONT_LEFT = RvcParamsId.HEATED_SEAT_FRONT_LEFT
+    FRONT_RIGHT = RvcParamsId.HEATED_SEAT_FRONT_RIGHT
     REAR_LEFT = RvcParamsId.HEATED_SEAT_REAR_LEFT
     REAR_RIGHT = RvcParamsId.HEATED_SEAT_REAR_RIGHT
 
diff --git a/src/saic_ismart_client_ng/api/vehicle/schema.py b/src/saic_ismart_client_ng/api/vehicle/schema.py
index cba2785..742207a 100644
--- a/src/saic_ismart_client_ng/api/vehicle/schema.py
+++ b/src/saic_ismart_client_ng/api/vehicle/schema.py
@@ -172,8 +172,15 @@ class RvcParamsId(Enum):
     WINDOW_3 = 11
     WINDOW_4 = 12
     WINDOW_OPEN_CLOSE = 13
-    HEATED_SEAT_DRIVER = 17
-    HEATED_SEAT_PASSENGER = 18
+    # Heated seats are addressed by PHYSICAL side, not driver/passenger:
+    # 17 is the front-left seat and 18 the front-right on both left- and
+    # right-hand drive cars (confirmed on a right-hand drive MG S6 EV, where
+    # the app's front-left seat sends 17). The DRIVER/PASSENGER names are the
+    # original ones, kept as aliases; they're only right for left-hand drive.
+    HEATED_SEAT_FRONT_LEFT = 17
+    HEATED_SEAT_FRONT_RIGHT = 18
+    HEATED_SEAT_DRIVER = 17  # noqa: PIE796 - alias of HEATED_SEAT_FRONT_LEFT
+    HEATED_SEAT_PASSENGER = 18  # noqa: PIE796 - alias of HEATED_SEAT_FRONT_RIGHT
     FAN_SPEED = 19
     TEMPERATURE = 20
     AC_ON_OFF = 22
diff --git a/tests/test_heated_seat_sides.py b/tests/test_heated_seat_sides.py
new file mode 100644
index 0000000..1ae7411
--- /dev/null
+++ b/tests/test_heated_seat_sides.py
@@ -0,0 +1,53 @@
+"""Front heated seats are named by physical side, not driver/passenger.
+
+Parameters 17 and 18 are the front-left and front-right seats on both left-
+and right-hand drive cars: on a right-hand drive MG S6 EV the iSmart app's
+front-left (passenger) seat sends 17. HEATED_SEAT_FRONT_LEFT/RIGHT are the
+new names; HEATED_SEAT_DRIVER/PASSENGER are kept as aliases, and the bytes
+sent are unchanged.
+"""
+
+from __future__ import annotations
+
+import base64
+from typing import Any
+import unittest
+
+from saic_ismart_client_ng import SaicApi
+from saic_ismart_client_ng.api.vehicle import RvcParamsId
+from saic_ismart_client_ng.api.vehicle.climate import HeatedSeat
+from saic_ismart_client_ng.model import SaicApiConfiguration
+
+
+class TestHeatedSeatSides(unittest.IsolatedAsyncioTestCase):
+    def test_front_seats_are_physical_sides(self) -> None:
+        assert RvcParamsId.HEATED_SEAT_FRONT_LEFT.value == 17
+        assert RvcParamsId.HEATED_SEAT_FRONT_RIGHT.value == 18
+        assert HeatedSeat.FRONT_LEFT.value is RvcParamsId.HEATED_SEAT_FRONT_LEFT
+        assert HeatedSeat.FRONT_RIGHT.value is RvcParamsId.HEATED_SEAT_FRONT_RIGHT
+
+    def test_old_names_still_work(self) -> None:
+        # Looked up by name: mypy doesn't know enum aliases share a member.
+        assert RvcParamsId["HEATED_SEAT_DRIVER"] is RvcParamsId.HEATED_SEAT_FRONT_LEFT
+        assert (
+            RvcParamsId["HEATED_SEAT_PASSENGER"] is RvcParamsId.HEATED_SEAT_FRONT_RIGHT
+        )
+
+    async def test_both_front_seats_command_unchanged(self) -> None:
+        api = SaicApi(SaicApiConfiguration(username="user", password="pass"))  # noqa: S106
+        captured: dict[str, Any] = {}
+
+        async def capture(body: Any, vin: str) -> None:
+            captured["body"] = body
+            captured["vin"] = vin
+
+        api.send_vehicle_control_command = capture  # type: ignore[method-assign,assignment]
+        await api.control_heated_seats(
+            "OFFLINE0000000000", left_side_level=1, right_side_level=3
+        )
+        await api.close()
+        params = [
+            (p.paramId, base64.b64decode(p.paramValue))
+            for p in captured["body"].rvcParams
+        ]
+        assert params == [(17, b"\x01"), (18, b"\x03"), (255, b"\x00\x00\x00\x00")]