diff --git a/res/values/strings.xml b/res/values/strings.xml
index 624e096..c8411ef 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -18,7 +18,10 @@
     <!-- Component name of default touch IME. This resource should be overlaid if a device uses an
          IME other than CarLatinIME. This resource should not be empty. -->
     <string name="default_touch_input_method" translatable="false">com.android.inputmethod.latin/.CarLatinIME</string>
-    <!-- Component name of rotary IME. Empty if none. -->
+    <!-- Component name of rotary IME. Empty if none. The value must be different from
+         default_touch_input_method.
+         If the value is not empty, this IME will be only used in rotary mode; otherwise, touch IME
+         will be used in both touch mode and rotary mode.  -->
     <string name="rotary_input_method" translatable="false"></string>
 
     <!-- Intents to launch an activity when the user nudges up, down, left, or right off the edge of
diff --git a/src/com/android/car/rotary/RotaryService.java b/src/com/android/car/rotary/RotaryService.java
index c6a84bb..c85e893 100644
--- a/src/com/android/car/rotary/RotaryService.java
+++ b/src/com/android/car/rotary/RotaryService.java
@@ -631,12 +631,13 @@
         validateImeConfiguration(mDefaultTouchInputMethod);
         mTouchInputMethod = mPrefs.getString(TOUCH_INPUT_METHOD_PREFIX
                 + mUserManager.getUserName(), mDefaultTouchInputMethod);
-        if (mTouchInputMethod.isEmpty()) {
+        // TODO(b/346437360): use a better way to initialize mTouchInputMethod.
+        if (mTouchInputMethod.isEmpty()
+                || !Utils.isInstalledIme(mTouchInputMethod, mInputMethodManager)) {
             // Workaround for b/323013736.
-            L.e("mTouchInputMethod shouldn't be empty!");
+            L.e("mTouchInputMethod is empty or not installed!");
             mTouchInputMethod = mDefaultTouchInputMethod;
         }
-        validateImeConfiguration(mTouchInputMethod);
 
         if (mRotaryInputMethod != null && mRotaryInputMethod.equals(getCurrentIme())) {
             // Switch from the rotary IME to the touch IME in case Android defaults to the rotary
@@ -768,6 +769,7 @@
     @Override
     public void onDestroy() {
         L.v("onDestroy");
+        mExecutor.shutdown();
         unregisterReceiver(mAppInstallUninstallReceiver);
 
         unregisterInputMethodObserver();
@@ -2055,7 +2057,7 @@
         if (mNavigator.supportTemplateApp()) {
             // Check if there is a SurfaceView node to decide whether the foreground app is an
             // AAOS template app. This is done on background thread to avoid ANR (b/322324727).
-            // TODO: find a better way to solve this to avoid potential race condition.
+            // TODO(b/322324727): find a better way to solve this to avoid potential race condition.
             mExecutor.execute(() -> {
                 // If the foreground app is a client app, store its package name.
                 AccessibilityNodeInfo surfaceView =
diff --git a/tests/unit/src/com/android/car/rotary/NavigatorTest.java b/tests/unit/src/com/android/car/rotary/NavigatorTest.java
index 9eb82e2..03fed32 100644
--- a/tests/unit/src/com/android/car/rotary/NavigatorTest.java
+++ b/tests/unit/src/com/android/car/rotary/NavigatorTest.java
@@ -75,7 +75,8 @@
 
     @BeforeClass
     public static void oneTimeSetup() {
-        sUiAutomoation = InstrumentationRegistry.getInstrumentation().getUiAutomation();
+        sUiAutomoation = InstrumentationRegistry.getInstrumentation().getUiAutomation(
+                UiAutomation.FLAG_DONT_SUPPRESS_ACCESSIBILITY_SERVICES);
 
         // FLAG_RETRIEVE_INTERACTIVE_WINDOWS is necessary to reliably access the root window.
         AccessibilityServiceInfo serviceInfo = sUiAutomoation.getServiceInfo();
diff --git a/tests/unit/src/com/android/car/rotary/RotaryServiceTest.java b/tests/unit/src/com/android/car/rotary/RotaryServiceTest.java
index b1a26f7..358e4c5 100644
--- a/tests/unit/src/com/android/car/rotary/RotaryServiceTest.java
+++ b/tests/unit/src/com/android/car/rotary/RotaryServiceTest.java
@@ -100,7 +100,8 @@
 
     @BeforeClass
     public static void setUpClass() {
-        sUiAutomation = InstrumentationRegistry.getInstrumentation().getUiAutomation();
+        sUiAutomation = InstrumentationRegistry.getInstrumentation().getUiAutomation(
+                UiAutomation.FLAG_DONT_SUPPRESS_ACCESSIBILITY_SERVICES);
 
         // FLAG_RETRIEVE_INTERACTIVE_WINDOWS is necessary to reliably access the root window.
         AccessibilityServiceInfo serviceInfo = sUiAutomation.getServiceInfo();