diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/HeadsUpAppearanceController.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/HeadsUpAppearanceController.java
index f15dcc3108373..a1f12b896d3b6 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/HeadsUpAppearanceController.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/HeadsUpAppearanceController.java
@@ -81,6 +81,7 @@ public class HeadsUpAppearanceController extends ViewController<HeadsUpStatusBar
     private final BiConsumer<Float, Float> mSetExpandedHeight = this::setAppearFraction;
     private final KeyguardBypassController mBypassController;
     private final StatusBarStateController mStatusBarStateController;
+    private final PhoneStatusBarTransitions mPhoneStatusBarTransitions;
     private final CommandQueue mCommandQueue;
     private final NotificationWakeUpCoordinator mWakeUpCoordinator;
 
@@ -109,6 +110,7 @@ public class HeadsUpAppearanceController extends ViewController<HeadsUpStatusBar
             NotificationIconAreaController notificationIconAreaController,
             HeadsUpManagerPhone headsUpManager,
             StatusBarStateController stateController,
+            PhoneStatusBarTransitions phoneStatusBarTransitions,
             KeyguardBypassController bypassController,
             NotificationWakeUpCoordinator wakeUpCoordinator,
             DarkIconDispatcher darkIconDispatcher,
@@ -156,6 +158,7 @@ public class HeadsUpAppearanceController extends ViewController<HeadsUpStatusBar
         });
         mBypassController = bypassController;
         mStatusBarStateController = stateController;
+        mPhoneStatusBarTransitions = phoneStatusBarTransitions;
         mWakeUpCoordinator = wakeUpCoordinator;
         mCommandQueue = commandQueue;
         mKeyguardStateController = keyguardStateController;
@@ -203,6 +206,7 @@ public class HeadsUpAppearanceController extends ViewController<HeadsUpStatusBar
     @Override
     public void onHeadsUpStateChanged(@NonNull NotificationEntry entry, boolean isHeadsUp) {
         updateHeadsUpAndPulsingRoundness(entry);
+        mPhoneStatusBarTransitions.onHeadsUpStateChanged(isHeadsUp);
     }
 
     private void updateTopEntry() {
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarTransitions.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarTransitions.java
index 15c6dcfd7889b..cc38405701f56 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarTransitions.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBarTransitions.java
@@ -31,6 +31,8 @@ public final class PhoneStatusBarTransitions extends BarTransitions {
 
     private final float mIconAlphaWhenOpaque;
 
+    private boolean mIsHeadsUp;
+
     private View mStartSide, mStatusIcons, mBattery;
     private Animator mCurrentAnimation;
 
@@ -52,15 +54,32 @@ public final class PhoneStatusBarTransitions extends BarTransitions {
         return ObjectAnimator.ofFloat(v, "alpha", v.getAlpha(), toAlpha);
     }
 
-    private float getNonBatteryClockAlphaFor(int mode) {
-        return isLightsOut(mode) ? ICON_ALPHA_WHEN_LIGHTS_OUT_NON_BATTERY_CLOCK
-                : !isOpaque(mode) ? ICON_ALPHA_WHEN_NOT_OPAQUE
-                : mIconAlphaWhenOpaque;
+    private float getStatusIconsAlphaFor(int mode) {
+        return getDefaultAlphaFor(mode);
+    }
+
+    private float getStartSideAlphaFor(int mode) {
+        // When there's a heads up notification, we need the start side icons to show regardless of
+        // lights out mode.
+        if (mIsHeadsUp) {
+            return getIconAlphaBasedOnOpacity(mode);
+        }
+        return getDefaultAlphaFor(mode);
     }
 
     private float getBatteryClockAlpha(int mode) {
         return isLightsOut(mode) ? ICON_ALPHA_WHEN_LIGHTS_OUT_BATTERY_CLOCK
-                : getNonBatteryClockAlphaFor(mode);
+                : getIconAlphaBasedOnOpacity(mode);
+    }
+
+    private float getDefaultAlphaFor(int mode) {
+        return isLightsOut(mode) ? ICON_ALPHA_WHEN_LIGHTS_OUT_NON_BATTERY_CLOCK
+                : getIconAlphaBasedOnOpacity(mode);
+    }
+
+    private float getIconAlphaBasedOnOpacity(int mode) {
+        return !isOpaque(mode) ? ICON_ALPHA_WHEN_NOT_OPAQUE
+                : mIconAlphaWhenOpaque;
     }
 
     private boolean isOpaque(int mode) {
@@ -74,19 +93,28 @@ public final class PhoneStatusBarTransitions extends BarTransitions {
         applyMode(newMode, animate);
     }
 
+    /** Informs this controller that the heads up notification state has changed. */
+    public void onHeadsUpStateChanged(boolean isHeadsUp) {
+        mIsHeadsUp = isHeadsUp;
+        // We want the icon to be fully visible when the HUN appears, so just immediately change the
+        // icon visibility and don't animate.
+        applyMode(getMode(), /* animate= */ false);
+    }
+
     private void applyMode(int mode, boolean animate) {
         if (mStartSide == null) return; // pre-init
-        float newAlpha = getNonBatteryClockAlphaFor(mode);
-        float newAlphaBC = getBatteryClockAlpha(mode);
+        float newStartSideAlpha = getStartSideAlphaFor(mode);
+        float newStatusIconsAlpha = getStatusIconsAlphaFor(mode);
+        float newBatteryAlpha = getBatteryClockAlpha(mode);
         if (mCurrentAnimation != null) {
             mCurrentAnimation.cancel();
         }
         if (animate) {
             AnimatorSet anims = new AnimatorSet();
             anims.playTogether(
-                    animateTransitionTo(mStartSide, newAlpha),
-                    animateTransitionTo(mStatusIcons, newAlpha),
-                    animateTransitionTo(mBattery, newAlphaBC)
+                    animateTransitionTo(mStartSide, newStartSideAlpha),
+                    animateTransitionTo(mStatusIcons, newStatusIconsAlpha),
+                    animateTransitionTo(mBattery, newBatteryAlpha)
                     );
             if (isLightsOut(mode)) {
                 anims.setDuration(LIGHTS_OUT_DURATION);
@@ -94,9 +122,9 @@ public final class PhoneStatusBarTransitions extends BarTransitions {
             anims.start();
             mCurrentAnimation = anims;
         } else {
-            mStartSide.setAlpha(newAlpha);
-            mStatusIcons.setAlpha(newAlpha);
-            mBattery.setAlpha(newAlphaBC);
+            mStartSide.setAlpha(newStartSideAlpha);
+            mStatusIcons.setAlpha(newStatusIconsAlpha);
+            mBattery.setAlpha(newBatteryAlpha);
         }
     }
 }
diff --git a/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/HeadsUpAppearanceControllerTest.java b/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/HeadsUpAppearanceControllerTest.java
index 2f1e372eb33de..ec6286b66ed2c 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/HeadsUpAppearanceControllerTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/HeadsUpAppearanceControllerTest.java
@@ -75,6 +75,7 @@ public class HeadsUpAppearanceControllerTest extends SysuiTestCase {
     private HeadsUpManagerPhone mHeadsUpManager;
     private View mOperatorNameView;
     private StatusBarStateController mStatusbarStateController;
+    private PhoneStatusBarTransitions mPhoneStatusBarTransitions;
     private KeyguardBypassController mBypassController;
     private NotificationWakeUpCoordinator mWakeUpCoordinator;
     private KeyguardStateController mKeyguardStateController;
@@ -95,6 +96,7 @@ public class HeadsUpAppearanceControllerTest extends SysuiTestCase {
         mHeadsUpManager = mock(HeadsUpManagerPhone.class);
         mOperatorNameView = new View(mContext);
         mStatusbarStateController = mock(StatusBarStateController.class);
+        mPhoneStatusBarTransitions = mock(PhoneStatusBarTransitions.class);
         mBypassController = mock(KeyguardBypassController.class);
         mWakeUpCoordinator = mock(NotificationWakeUpCoordinator.class);
         mKeyguardStateController = mock(KeyguardStateController.class);
@@ -105,6 +107,7 @@ public class HeadsUpAppearanceControllerTest extends SysuiTestCase {
                 mock(NotificationIconAreaController.class),
                 mHeadsUpManager,
                 mStatusbarStateController,
+                mPhoneStatusBarTransitions,
                 mBypassController,
                 mWakeUpCoordinator,
                 mDarkIconDispatcher,
@@ -188,6 +191,7 @@ public class HeadsUpAppearanceControllerTest extends SysuiTestCase {
                 mock(NotificationIconAreaController.class),
                 mHeadsUpManager,
                 mStatusbarStateController,
+                mPhoneStatusBarTransitions,
                 mBypassController,
                 mWakeUpCoordinator,
                 mDarkIconDispatcher,
@@ -283,4 +287,18 @@ public class HeadsUpAppearanceControllerTest extends SysuiTestCase {
                 /* delta = */ 0.001
         );
     }
+
+    @Test
+    public void onHeadsUpStateChanged_true_transitionsNotified() {
+        mHeadsUpAppearanceController.onHeadsUpStateChanged(mEntry, true);
+
+        verify(mPhoneStatusBarTransitions).onHeadsUpStateChanged(true);
+    }
+
+    @Test
+    public void onHeadsUpStateChanged_false_transitionsNotified() {
+        mHeadsUpAppearanceController.onHeadsUpStateChanged(mEntry, false);
+
+        verify(mPhoneStatusBarTransitions).onHeadsUpStateChanged(false);
+    }
 }
diff --git a/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/PhoneStatusBarTransitionsTest.kt b/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/PhoneStatusBarTransitionsTest.kt
new file mode 100644
index 0000000000000..4af1b24ba96c8
--- /dev/null
+++ b/packages/SystemUI/tests/src/com/android/systemui/statusbar/phone/PhoneStatusBarTransitionsTest.kt
@@ -0,0 +1,237 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+
+package com.android.systemui.statusbar.phone
+
+import android.testing.TestableLooper
+import android.view.View
+import androidx.test.filters.SmallTest
+import com.android.systemui.R
+import com.android.systemui.SysuiTestCase
+import com.android.systemui.statusbar.phone.BarTransitions.MODE_LIGHTS_OUT
+import com.android.systemui.statusbar.phone.BarTransitions.MODE_LIGHTS_OUT_TRANSPARENT
+import com.android.systemui.statusbar.phone.BarTransitions.MODE_OPAQUE
+import com.android.systemui.statusbar.phone.BarTransitions.MODE_SEMI_TRANSPARENT
+import com.android.systemui.statusbar.phone.BarTransitions.MODE_TRANSLUCENT
+import com.android.systemui.statusbar.phone.BarTransitions.MODE_TRANSPARENT
+import com.android.systemui.util.mockito.argumentCaptor
+import com.android.systemui.util.mockito.mock
+import com.android.systemui.util.mockito.whenever
+import com.google.common.truth.Truth.assertThat
+import org.junit.Before
+import org.junit.Test
+import org.mockito.Mockito.reset
+import org.mockito.Mockito.verify
+
+@SmallTest
+@TestableLooper.RunWithLooper(setAsMainLooper = true)
+class PhoneStatusBarTransitionsTest : SysuiTestCase() {
+
+    // PhoneStatusBarView does a lot of non-standard things when inflating, so just use mocks.
+    private val batteryView = mock<View>()
+    private val statusIcons = mock<View>()
+    private val startIcons = mock<View>()
+    private val statusBarView =
+        mock<PhoneStatusBarView>().apply {
+            whenever(this.context).thenReturn(mContext)
+            whenever(this.findViewById<View>(R.id.battery)).thenReturn(batteryView)
+            whenever(this.findViewById<View>(R.id.statusIcons)).thenReturn(statusIcons)
+            whenever(this.findViewById<View>(R.id.status_bar_start_side_except_heads_up))
+                .thenReturn(startIcons)
+        }
+    private val backgroundView = mock<View>().apply { whenever(this.context).thenReturn(mContext) }
+
+    private val underTest: PhoneStatusBarTransitions by lazy {
+        PhoneStatusBarTransitions(statusBarView, backgroundView).also {
+            // The views' alphas will be set when PhoneStatusBarTransitions is created and we want
+            // to ignore those in the tests, so clear those verifications here.
+            reset(batteryView)
+            reset(statusIcons)
+            reset(startIcons)
+        }
+    }
+
+    @Before
+    fun setUp() {
+        context.orCreateTestableResources.addOverride(
+            R.dimen.status_bar_icon_drawing_alpha,
+            RESOURCE_ALPHA,
+        )
+    }
+
+    @Test
+    fun transitionTo_lightsOutMode_batteryTranslucent() {
+        underTest.transitionTo(/* mode= */ MODE_LIGHTS_OUT, /* animate= */ false)
+
+        val alpha = batteryView.capturedAlpha()
+        assertThat(alpha).isGreaterThan(0)
+        assertThat(alpha).isLessThan(1)
+    }
+
+    @Test
+    fun transitionTo_lightsOutMode_statusIconsHidden() {
+        underTest.transitionTo(/* mode= */ MODE_LIGHTS_OUT, /* animate= */ false)
+
+        assertThat(statusIcons.capturedAlpha()).isEqualTo(0)
+    }
+
+    @Test
+    fun transitionTo_lightsOutMode_startIconsHidden() {
+        underTest.transitionTo(/* mode= */ MODE_LIGHTS_OUT, /* animate= */ false)
+
+        assertThat(startIcons.capturedAlpha()).isEqualTo(0)
+    }
+
+    @Test
+    fun transitionTo_lightsOutTransparentMode_batteryTranslucent() {
+        underTest.transitionTo(/* mode= */ MODE_LIGHTS_OUT_TRANSPARENT, /* animate= */ false)
+
+        val alpha = batteryView.capturedAlpha()
+        assertThat(alpha).isGreaterThan(0)
+        assertThat(alpha).isLessThan(1)
+    }
+
+    @Test
+    fun transitionTo_lightsOutTransparentMode_statusIconsHidden() {
+        underTest.transitionTo(/* mode= */ MODE_LIGHTS_OUT_TRANSPARENT, /* animate= */ false)
+
+        assertThat(statusIcons.capturedAlpha()).isEqualTo(0)
+    }
+
+    @Test
+    fun transitionTo_lightsOutTransparentMode_startIconsHidden() {
+        underTest.transitionTo(/* mode= */ MODE_LIGHTS_OUT_TRANSPARENT, /* animate= */ false)
+
+        assertThat(startIcons.capturedAlpha()).isEqualTo(0)
+    }
+
+    @Test
+    fun transitionTo_translucentMode_batteryIconShown() {
+        underTest.transitionTo(/* mode= */ MODE_TRANSLUCENT, /* animate= */ false)
+
+        assertThat(batteryView.capturedAlpha()).isEqualTo(1)
+    }
+
+    @Test
+    fun transitionTo_semiTransparentMode_statusIconsShown() {
+        underTest.transitionTo(/* mode= */ MODE_SEMI_TRANSPARENT, /* animate= */ false)
+
+        assertThat(statusIcons.capturedAlpha()).isEqualTo(1)
+    }
+
+    @Test
+    fun transitionTo_transparentMode_startIconsShown() {
+        // Transparent is the default, so we need to switch to a different mode first
+        underTest.transitionTo(/* mode= */ MODE_OPAQUE, /* animate= */ false)
+        reset(startIcons)
+
+        underTest.transitionTo(/* mode= */ MODE_TRANSPARENT, /* animate= */ false)
+
+        assertThat(startIcons.capturedAlpha()).isEqualTo(1)
+    }
+
+    @Test
+    fun transitionTo_opaqueMode_batteryIconUsesResourceAlpha() {
+        underTest.transitionTo(/* mode= */ MODE_OPAQUE, /* animate= */ false)
+
+        assertThat(batteryView.capturedAlpha()).isEqualTo(RESOURCE_ALPHA)
+    }
+
+    @Test
+    fun transitionTo_opaqueMode_statusIconsUseResourceAlpha() {
+        underTest.transitionTo(/* mode= */ MODE_OPAQUE, /* animate= */ false)
+
+        assertThat(statusIcons.capturedAlpha()).isEqualTo(RESOURCE_ALPHA)
+    }
+
+    @Test
+    fun transitionTo_opaqueMode_startIconsUseResourceAlpha() {
+        underTest.transitionTo(/* mode= */ MODE_OPAQUE, /* animate= */ false)
+
+        assertThat(startIcons.capturedAlpha()).isEqualTo(RESOURCE_ALPHA)
+    }
+
+    @Test
+    fun onHeadsUpStateChanged_true_semiTransparentMode_startIconsShown() {
+        underTest.transitionTo(/* mode= */ MODE_SEMI_TRANSPARENT, /* animate= */ false)
+        reset(startIcons)
+
+        underTest.onHeadsUpStateChanged(true)
+
+        assertThat(startIcons.capturedAlpha()).isEqualTo(1)
+    }
+
+    @Test
+    fun onHeadsUpStateChanged_true_opaqueMode_startIconsUseResourceAlpha() {
+        underTest.transitionTo(/* mode= */ MODE_OPAQUE, /* animate= */ false)
+        reset(startIcons)
+
+        underTest.onHeadsUpStateChanged(true)
+
+        assertThat(startIcons.capturedAlpha()).isEqualTo(RESOURCE_ALPHA)
+    }
+
+    /** Regression test for b/291173113. */
+    @Test
+    fun onHeadsUpStateChanged_true_lightsOutMode_startIconsUseResourceAlpha() {
+        underTest.transitionTo(/* mode= */ MODE_LIGHTS_OUT, /* animate= */ false)
+        reset(startIcons)
+
+        underTest.onHeadsUpStateChanged(true)
+
+        assertThat(startIcons.capturedAlpha()).isEqualTo(RESOURCE_ALPHA)
+    }
+
+    @Test
+    fun onHeadsUpStateChanged_false_semiTransparentMode_startIconsShown() {
+        underTest.transitionTo(/* mode= */ MODE_SEMI_TRANSPARENT, /* animate= */ false)
+        reset(startIcons)
+
+        underTest.onHeadsUpStateChanged(false)
+
+        assertThat(startIcons.capturedAlpha()).isEqualTo(1)
+    }
+
+    @Test
+    fun onHeadsUpStateChanged_false_opaqueMode_startIconsUseResourceAlpha() {
+        underTest.transitionTo(/* mode= */ MODE_OPAQUE, /* animate= */ false)
+        reset(startIcons)
+
+        underTest.onHeadsUpStateChanged(false)
+
+        assertThat(startIcons.capturedAlpha()).isEqualTo(RESOURCE_ALPHA)
+    }
+
+    @Test
+    fun onHeadsUpStateChanged_false_lightsOutMode_startIconsHidden() {
+        underTest.transitionTo(/* mode= */ MODE_LIGHTS_OUT, /* animate= */ false)
+        reset(startIcons)
+
+        underTest.onHeadsUpStateChanged(false)
+
+        assertThat(startIcons.capturedAlpha()).isEqualTo(0)
+    }
+
+    private fun View.capturedAlpha(): Float {
+        val captor = argumentCaptor<Float>()
+        verify(this).alpha = captor.capture()
+        return captor.value
+    }
+
+    private companion object {
+        const val RESOURCE_ALPHA = 0.34f
+    }
+}