Index: firmware/App/Modes/OperationModes.c
===================================================================
diff -u -ra7821aff3dc204a060233b0753253ec04d020557 -r33172fb03fd33afef26de13c343480c62cfa1a3c
--- firmware/App/Modes/OperationModes.c	(.../OperationModes.c)	(revision a7821aff3dc204a060233b0753253ec04d020557)
+++ firmware/App/Modes/OperationModes.c	(.../OperationModes.c)	(revision 33172fb03fd33afef26de13c343480c62cfa1a3c)
@@ -61,7 +61,8 @@
 static HD_OP_MODE_T currentMode;                            ///< Current operation mode.
 static U32 currentSubMode;                                  ///< The currently active state of the active mode.
 static U32 broadcastModeIntervalCtr;                        ///< Interval counter used to determine when to broadcast operation mode.  Initialize to 11 to stagger broadcast.
-static U32 currentSubState;
+static U32 currentSubState;                                 ///< current sub state.
+static U32 current4thLevelState;                            ///< current 4th level state.
 /// Interval (in task intervals) at which to publish operation mode data to CAN bus.
 static OVERRIDE_U32_T opModePublishInterval = { BROADCAST_HD_OP_MODE_INTERVAL, BROADCAST_HD_OP_MODE_INTERVAL, BROADCAST_HD_OP_MODE_INTERVAL, 0 };
 /// Local structure init for saving confirmation requests
@@ -112,7 +113,8 @@
     lastMode                 = MODE_INIT;
     currentMode              = MODE_INIT;
     currentSubMode           = 0;
-    currentSubState          = 0xFF;
+    currentSubState          = NO_SUB_STATE;
+    current4thLevelState     = NO_SUB_STATE;
     broadcastModeIntervalCtr = DATA_PUBLISH_COUNTER_START_COUNT;
 
     transitionToNewOperationMode( MODE_INIT );
@@ -141,6 +143,7 @@
     U32 priorSubMode = currentSubMode;
     U32 priorSubState = currentSubState;
     U32 priorOpMode = (U32)currentMode;
+    U32 prior4thLevelState = current4thLevelState;
 
     // Any new mode requests?
     newMode = arbitrateModeRequest();   // Will return current mode if no pending requests
@@ -215,7 +218,8 @@
     }   // End switch
 
     // Send operation status event when appropriate
-    if ( priorOpMode != currentMode || priorSubMode != currentSubMode || priorSubState != currentSubState )
+    if ( priorOpMode != currentMode || priorSubMode != currentSubMode ||
+         priorSubState != currentSubState || prior4thLevelState != current4thLevelState )
     {
         sendOperationStatusEvent();
         SEND_EVENT_WITH_2_U32_DATA( HD_EVENT_SUB_MODE_CHANGE, priorSubMode, currentSubMode )
@@ -593,6 +597,19 @@
 
 /*********************************************************************//**
  * @brief
+ * The setCurrentSubState function sets the current subState.
+ * @details Inputs: subState
+ * @details Outputs: currentSubState
+ * @param subState the enumerated sub state.
+ * @return none
+ *************************************************************************/
+void setCurrent4thLevelState( U32 state )
+{
+    current4thLevelState = state;
+}
+
+/*********************************************************************//**
+ * @brief
  * The sendOperationStatusEvent function constructs and sends an HD operation
  * status event.
  * @details Inputs: currentMode, currentSubMode, currentSubState
@@ -606,7 +623,8 @@
     EVENT_DATA_T dat2;
     U32 opData = ( (U08)currentMode +
                  ( (U08)currentSubMode << SHIFT_8_BITS_FOR_BYTE_SHIFT ) +
-                 ( (U08)currentSubState << SHIFT_16_BITS_FOR_WORD_SHIFT ) );
+                 ( (U08)currentSubState << SHIFT_16_BITS_FOR_WORD_SHIFT ) +
+                 ( (U08)current4thLevelState << SHIFT_24_BITS ) );
 
     dat2.dataType = EVENT_DATA_TYPE_U32;
     dat2.data.uInt.data = 0;