diff --git a/automotive/occupant_awareness/aidl/default/Android.bp b/automotive/occupant_awareness/aidl/default/Android.bp
new file mode 100644
index 0000000..1b2fba2
--- /dev/null
+++ b/automotive/occupant_awareness/aidl/default/Android.bp
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+cc_binary {
+    name: "android.hardware.automotive.occupant_awareness@1.0-service",
+    init_rc: ["android.hardware.automotive.occupant_awareness@1.0-service.rc"],
+    relative_install_path: "hw",
+    vendor: true,
+    srcs: [
+        "service.cpp",
+        "OccupantAwareness.cpp",
+    ],
+    shared_libs: [
+        "libbase",
+        "libbinder_ndk",
+        "libutils",
+        "android.hardware.automotive.occupant_awareness-ndk_platform",
+    ],
+}
diff --git a/automotive/occupant_awareness/aidl/default/OccupantAwareness.cpp b/automotive/occupant_awareness/aidl/default/OccupantAwareness.cpp
new file mode 100644
index 0000000..ef5055f
--- /dev/null
+++ b/automotive/occupant_awareness/aidl/default/OccupantAwareness.cpp
@@ -0,0 +1,122 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "OccupantAwareness.h"
+
+namespace android {
+namespace hardware {
+namespace automotive {
+namespace occupant_awareness {
+namespace V1_0 {
+namespace implementation {
+
+using ndk::ScopedAStatus;
+
+static const int32_t kAllCapabilities = OccupantAwareness::CAP_PRESENSE_DETECTION |
+                                        OccupantAwareness::CAP_GAZE_DETECTION |
+                                        OccupantAwareness::CAP_DRIVER_MONITORING_DETECTION;
+
+ScopedAStatus OccupantAwareness::startDetection(OccupantAwarenessStatus* status) {
+    std::lock_guard<std::mutex> lock(mMutex);
+    if (mStatus != OccupantAwarenessStatus::NOT_SUPPORTED) {
+        mStatus = OccupantAwarenessStatus::NOT_SUPPORTED;
+        if (mCallback) {
+            mCallback->onSystemStatusChanged(kAllCapabilities,
+                                             OccupantAwarenessStatus::NOT_SUPPORTED);
+        }
+    }
+    *status = mStatus;
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus OccupantAwareness::stopDetection(OccupantAwarenessStatus* status) {
+    std::lock_guard<std::mutex> lock(mMutex);
+    if (mStatus != OccupantAwarenessStatus::NOT_INITIALIZED) {
+        mStatus = OccupantAwarenessStatus::NOT_INITIALIZED;
+        if (mCallback) {
+            mCallback->onSystemStatusChanged(kAllCapabilities,
+                                             OccupantAwarenessStatus::NOT_INITIALIZED);
+        }
+    }
+    *status = mStatus;
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus OccupantAwareness::getCapabilityForRole(Role occupantRole, int32_t* capabilities) {
+    if (!isValidRole(occupantRole)) {
+        return ScopedAStatus::fromExceptionCode(EX_TRANSACTION_FAILED);
+    }
+
+    // No awareness capability for default HAL.
+    *capabilities = 0;
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus OccupantAwareness::getState(Role occupantRole, int detectionCapability,
+                                          OccupantAwarenessStatus* status) {
+    if (!isValidRole(occupantRole)) {
+        return ScopedAStatus::fromExceptionCode(EX_TRANSACTION_FAILED);
+    }
+
+    if (!isValidDetectionCapabilities(detectionCapability) ||
+        !isSingularCapability(detectionCapability)) {
+        return ScopedAStatus::fromExceptionCode(EX_TRANSACTION_FAILED);
+    }
+
+    std::lock_guard<std::mutex> lock(mMutex);
+    *status = mStatus;
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus OccupantAwareness::setCallback(
+        const std::shared_ptr<IOccupantAwarenessClientCallback>& callback) {
+    if (callback == nullptr) {
+        return ScopedAStatus::fromExceptionCode(EX_TRANSACTION_FAILED);
+    }
+
+    std::lock_guard<std::mutex> lock(mMutex);
+    mCallback = callback;
+    return ScopedAStatus::ok();
+}
+
+ScopedAStatus OccupantAwareness::getLatestDetection(OccupantDetections* detections) {
+    // No detection generated for default hal.
+    (void)detections;
+    return ScopedAStatus::fromExceptionCode(EX_TRANSACTION_FAILED);
+}
+
+bool OccupantAwareness::isValidRole(Role occupantRole) {
+    int intVal = static_cast<int>(occupantRole);
+    int allOccupants = static_cast<int>(Role::ALL_OCCUPANTS);
+    return (occupantRole != Role::INVALID) && ((intVal & (~allOccupants)) == 0);
+}
+
+bool OccupantAwareness::isValidDetectionCapabilities(int detectionCapabilities) {
+    return (detectionCapabilities != CAP_NONE) &&
+           ((detectionCapabilities & (~kAllCapabilities)) == 0);
+}
+
+bool OccupantAwareness::isSingularCapability(int detectionCapability) {
+    // Check whether the value is 0, or the value has only one bit set.
+    return (detectionCapability & (detectionCapability - 1)) == 0;
+}
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace occupant_awareness
+}  // namespace automotive
+}  // namespace hardware
+}  // namespace android
diff --git a/automotive/occupant_awareness/aidl/default/OccupantAwareness.h b/automotive/occupant_awareness/aidl/default/OccupantAwareness.h
new file mode 100644
index 0000000..ac51aa4
--- /dev/null
+++ b/automotive/occupant_awareness/aidl/default/OccupantAwareness.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+#include <aidl/android/hardware/automotive/occupant_awareness/BnOccupantAwareness.h>
+#include <aidl/android/hardware/automotive/occupant_awareness/BnOccupantAwarenessClientCallback.h>
+#include <utils/StrongPointer.h>
+
+namespace android {
+namespace hardware {
+namespace automotive {
+namespace occupant_awareness {
+namespace V1_0 {
+namespace implementation {
+
+using ::aidl::android::hardware::automotive::occupant_awareness::BnOccupantAwareness;
+using ::aidl::android::hardware::automotive::occupant_awareness::IOccupantAwarenessClientCallback;
+using ::aidl::android::hardware::automotive::occupant_awareness::OccupantAwarenessStatus;
+using ::aidl::android::hardware::automotive::occupant_awareness::OccupantDetections;
+using ::aidl::android::hardware::automotive::occupant_awareness::Role;
+
+/**
+ * The default HAL mimics a system which has no Occupant awareness capability. The hal does not
+ * do any useful work, and returns appropriate failure code / status.
+ **/
+class OccupantAwareness : public BnOccupantAwareness {
+  public:
+    // Methods from ::android::hardware::automotive::occupant_awareness::IOccupantAwareness
+    // follow.
+    ndk::ScopedAStatus startDetection(OccupantAwarenessStatus* status) override;
+    ndk::ScopedAStatus stopDetection(OccupantAwarenessStatus* status) override;
+    ndk::ScopedAStatus getCapabilityForRole(Role occupantRole, int32_t* capabilities) override;
+    ndk::ScopedAStatus getState(Role occupantRole, int detectionCapability,
+                                OccupantAwarenessStatus* status) override;
+    ndk::ScopedAStatus setCallback(
+            const std::shared_ptr<IOccupantAwarenessClientCallback>& callback) override;
+    ndk::ScopedAStatus getLatestDetection(OccupantDetections* detections) override;
+
+  private:
+    bool isValidRole(Role occupantRole);
+    bool isValidDetectionCapabilities(int detectionCapabilities);
+    bool isSingularCapability(int detectionCapability);
+
+    std::mutex mMutex;
+    std::shared_ptr<IOccupantAwarenessClientCallback> mCallback = nullptr;
+    OccupantAwarenessStatus mStatus = OccupantAwarenessStatus::NOT_INITIALIZED;
+};
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace occupant_awareness
+}  // namespace automotive
+}  // namespace hardware
+}  // namespace android
diff --git a/automotive/occupant_awareness/aidl/default/android.hardware.automotive.occupant_awareness@1.0-service.rc b/automotive/occupant_awareness/aidl/default/android.hardware.automotive.occupant_awareness@1.0-service.rc
new file mode 100644
index 0000000..35d5bca
--- /dev/null
+++ b/automotive/occupant_awareness/aidl/default/android.hardware.automotive.occupant_awareness@1.0-service.rc
@@ -0,0 +1,4 @@
+service hal_occupant_awareness_default /vendor/bin/hw/android.hardware.automotive.occupant_awareness@1.0-service
+    class hal
+    user system
+    group system
diff --git a/automotive/occupant_awareness/aidl/default/service.cpp b/automotive/occupant_awareness/aidl/default/service.cpp
new file mode 100644
index 0000000..44960fb
--- /dev/null
+++ b/automotive/occupant_awareness/aidl/default/service.cpp
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "android.hardware.automotive.occupant_awareness@1.0-service"
+
+#include <unistd.h>
+
+#include <android-base/logging.h>
+#include <android/binder_manager.h>
+#include <android/binder_process.h>
+
+#include "OccupantAwareness.h"
+
+using ::aidl::android::hardware::automotive::occupant_awareness::IOccupantAwareness;
+using ::android::hardware::automotive::occupant_awareness::V1_0::implementation::OccupantAwareness;
+using ::ndk::ScopedAStatus;
+using ::ndk::SharedRefBase;
+
+const static char kOccupantAwarenessServiceName[] = "default";
+
+int main() {
+    ABinderProcess_setThreadPoolMaxThreadCount(0);
+    LOG(INFO) << "Occupant Awareness service is starting";
+    std::shared_ptr<OccupantAwareness> occupantAwareness = SharedRefBase::make<OccupantAwareness>();
+
+    const std::string instance =
+            std::string() + IOccupantAwareness::descriptor + "/" + kOccupantAwarenessServiceName;
+
+    binder_status_t status =
+            AServiceManager_addService(occupantAwareness->asBinder().get(), instance.c_str());
+    if (status == STATUS_OK) {
+        LOG(INFO) << "Service " << kOccupantAwarenessServiceName << " is ready";
+        ABinderProcess_joinThreadPool();
+    } else {
+        LOG(ERROR) << "Could not register service " << kOccupantAwarenessServiceName
+                   << ", status: " << status;
+    }
+
+    // In normal operation, we don't expect the thread pool to exit.
+    LOG(ERROR) << "Occupant Awareness service is shutting down";
+    return 1;
+}
diff --git a/compatibility_matrices/compatibility_matrix.current.xml b/compatibility_matrices/compatibility_matrix.current.xml
index 4bd8332..c9eb6d4 100644
--- a/compatibility_matrices/compatibility_matrix.current.xml
+++ b/compatibility_matrices/compatibility_matrix.current.xml
@@ -49,6 +49,13 @@
             <instance>default</instance>
         </interface>
     </hal>
+    <hal format="aidl" optional="true">
+        <name>android.hardware.automotive.occupant_awareness</name>
+        <interface>
+            <name>IOccupantAwareness</name>
+            <instance>default</instance>
+        </interface>
+    </hal>
     <hal format="hidl" optional="true">
         <name>android.hardware.automotive.vehicle</name>
         <version>2.0</version>