Index: firmware/App/Services/WatchdogMgmt.c
===================================================================
diff -u -ra2bc96881a5fc3d8f779246b2abebf15a8de9384 -rf3326a3d0fd2a465a518e31ee578e335db301c27
--- firmware/App/Services/WatchdogMgmt.c	(.../WatchdogMgmt.c)	(revision a2bc96881a5fc3d8f779246b2abebf15a8de9384)
+++ firmware/App/Services/WatchdogMgmt.c	(.../WatchdogMgmt.c)	(revision f3326a3d0fd2a465a518e31ee578e335db301c27)
@@ -15,7 +15,8 @@
 *
 ***************************************************************************/
 
-#include "CPLD.h"
+#include "CPLD.h"
+#include "InternalADC.h"
 #include "SafetyShutdown.h"
 #include "SystemCommMessages.h"
 #include "Timers.h"
@@ -30,8 +31,11 @@
 
 #define MIN_WATCHDOG_PET_INTERVAL_MS        45                                              ///< Minimum watchdog pet interval (in ms).
 #define WATCHDOG_POST_TIMEOUT_MS            100                                             ///< Watchdog POST test timeout (in ms).
-#define WATCHDOG_RECOVERY_TIME_MS           250                                             ///< After watchdog POST test, wait this long (in ms) before moving on.
+#define WATCHDOG_RECOVERY_TIME_MS           250                                             ///< After watchdog POST test, wait this long (in ms) before moving on.
 
+#define MAX_24V_LEVEL_ON_WATCHDOG_EXPIRED   1.0                                             ///< Maximum voltage on 24V line when watchdog is expired.
+#define MIN_BACKUP_ALARM_CURRENT            10.0                                            ///< Minimum backup alarm audio current (in mA) detected when watchdog is expired.
+
 /// Enumeration of watchdog self-test states.
 typedef enum Watchdog_Self_Test_States
 {
@@ -165,6 +169,17 @@
             }
             if ( getCPLDWatchdogExpired() == PIN_SIGNAL_HIGH )
             {
+                // Verify 24V is down when w.d. expired
+                if ( getIntADCVoltageConverted( INT_ADC_24V_ACTUATORS ) > MAX_24V_LEVEL_ON_WATCHDOG_EXPIRED )
+                {
+                    // TODO - alarm
+                }
+                // Verify backup alarm audio is on when w.d. expired
+                if ( getIntADCVoltageConverted( INT_ADC_BACKUP_ALARM_CURRENT ) < MIN_BACKUP_ALARM_CURRENT )
+                {
+                    // TODO - alarm
+                }
+                // TODO - user needs to verify backup alarm audio and LED?
                 watchdogSelfTestStatus = SELF_TEST_STATUS_PASSED;
             }
             else