From cf6eaeced800c2aa3dcf2cd03c5adf241c386bbb Mon Sep 17 00:00:00 2001
From: Brett Adams <Bre77@users.noreply.github.com>
Date: Fri, 31 Jul 2026 14:28:19 +1000
Subject: [PATCH] Add rear defroster binary sensor to Teslemetry (#177609)

---
 .../components/teslemetry/binary_sensor.py    | 10 +++
 .../components/teslemetry/strings.json        |  3 +
 .../snapshots/test_binary_sensor.ambr         | 65 +++++++++++++++++++
 .../teslemetry/test_binary_sensor.py          |  2 +
 4 files changed, 80 insertions(+)

diff --git a/homeassistant/components/teslemetry/binary_sensor.py b/homeassistant/components/teslemetry/binary_sensor.py
index e64af7b6e078..f0d1f671ae37 100644
--- a/homeassistant/components/teslemetry/binary_sensor.py
+++ b/homeassistant/components/teslemetry/binary_sensor.py
@@ -139,6 +139,16 @@ VEHICLE_DESCRIPTIONS: tuple[TeslemetryBinarySensorEntityDescription, ...] = (
         entity_category=EntityCategory.DIAGNOSTIC,
         entity_registry_enabled_default=False,
     ),
+    TeslemetryBinarySensorEntityDescription(
+        key="climate_state_is_rear_defroster_on",
+        polling=True,
+        streaming_listener=lambda vehicle, callback: vehicle.listen_RearDefrostEnabled(
+            callback
+        ),
+        device_class=BinarySensorDeviceClass.HEAT,
+        entity_category=EntityCategory.DIAGNOSTIC,
+        entity_registry_enabled_default=False,
+    ),
     TeslemetryBinarySensorEntityDescription(
         key="vehicle_state_dashcam_state",
         polling=True,
diff --git a/homeassistant/components/teslemetry/strings.json b/homeassistant/components/teslemetry/strings.json
index 84957296f254..974171c5b47a 100644
--- a/homeassistant/components/teslemetry/strings.json
+++ b/homeassistant/components/teslemetry/strings.json
@@ -104,6 +104,9 @@
       "climate_state_is_preconditioning": {
         "name": "Preconditioning"
       },
+      "climate_state_is_rear_defroster_on": {
+        "name": "Rear defroster"
+      },
       "components_grid_services_enabled": {
         "name": "Grid services enabled"
       },
diff --git a/tests/components/teslemetry/snapshots/test_binary_sensor.ambr b/tests/components/teslemetry/snapshots/test_binary_sensor.ambr
index f96e11d555b6..70d4447cff51 100644
--- a/tests/components/teslemetry/snapshots/test_binary_sensor.ambr
+++ b/tests/components/teslemetry/snapshots/test_binary_sensor.ambr
@@ -808,6 +808,57 @@
     'state': 'off',
   })
 # ---
+# name: test_binary_sensor[binary_sensor.test_rear_defroster-entry]
+  EntityRegistryEntrySnapshot({
+    'aliases': list([
+      None,
+    ]),
+    'area_id': None,
+    'capabilities': None,
+    'config_entry_id': <ANY>,
+    'config_subentry_id': <ANY>,
+    'device_class': None,
+    'device_id': <ANY>,
+    'disabled_by': None,
+    'domain': 'binary_sensor',
+    'entity_category': <EntityCategory.DIAGNOSTIC: 'diagnostic'>,
+    'entity_id': 'binary_sensor.test_rear_defroster',
+    'has_entity_name': True,
+    'hidden_by': None,
+    'icon': None,
+    'id': <ANY>,
+    'labels': set({
+    }),
+    'name': None,
+    'object_id_base': 'Rear defroster',
+    'options': dict({
+    }),
+    'original_device_class': <BinarySensorDeviceClass.HEAT: 'heat'>,
+    'original_icon': None,
+    'original_name': 'Rear defroster',
+    'platform': 'teslemetry',
+    'previous_unique_id': None,
+    'suggested_object_id': None,
+    'supported_features': 0,
+    'translation_key': 'climate_state_is_rear_defroster_on',
+    'unique_id': 'LRW3F7EK4NC700000-climate_state_is_rear_defroster_on',
+    'unit_of_measurement': None,
+  })
+# ---
+# name: test_binary_sensor[binary_sensor.test_rear_defroster-state]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      <EntityStateAttribute.DEVICE_CLASS: 'device_class'>: 'heat',
+      <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Test Rear defroster',
+    }),
+    'context': <ANY>,
+    'entity_id': 'binary_sensor.test_rear_defroster',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': 'off',
+  })
+# ---
 # name: test_binary_sensor[binary_sensor.test_rear_driver_door-entry]
   EntityRegistryEntrySnapshot({
     'aliases': list([
@@ -1635,6 +1686,20 @@
     'state': 'off',
   })
 # ---
+# name: test_binary_sensor_refresh[binary_sensor.test_rear_defroster-statealt]
+  StateSnapshot({
+    'attributes': ReadOnlyDict({
+      <EntityStateAttribute.DEVICE_CLASS: 'device_class'>: 'heat',
+      <EntityStateAttribute.FRIENDLY_NAME: 'friendly_name'>: 'Test Rear defroster',
+    }),
+    'context': <ANY>,
+    'entity_id': 'binary_sensor.test_rear_defroster',
+    'last_changed': <ANY>,
+    'last_reported': <ANY>,
+    'last_updated': <ANY>,
+    'state': 'off',
+  })
+# ---
 # name: test_binary_sensor_refresh[binary_sensor.test_rear_driver_door-statealt]
   StateSnapshot({
     'attributes': ReadOnlyDict({
diff --git a/tests/components/teslemetry/test_binary_sensor.py b/tests/components/teslemetry/test_binary_sensor.py
index bf7bea16d935..1f13871be3a7 100644
--- a/tests/components/teslemetry/test_binary_sensor.py
+++ b/tests/components/teslemetry/test_binary_sensor.py
@@ -86,6 +86,7 @@ async def test_binary_sensors_streaming(
                     }
                 },
                 Signal.DRIVER_SEAT_BELT: None,
+                Signal.REAR_DEFROST_ENABLED: True,
             },
             "createdAt": "2024-10-04T10:45:17.537Z",
         }
@@ -104,6 +105,7 @@ async def test_binary_sensors_streaming(
     assert hass.states.get("binary_sensor.test_front_driver_door").state == "off"
     assert hass.states.get("binary_sensor.test_front_passenger_door").state == "off"
     assert hass.states.get("binary_sensor.test_driver_seat_belt").state == "off"
+    assert hass.states.get("binary_sensor.test_rear_defroster").state == "on"
 
 
 async def test_binary_sensors_connectivity(