diff --git a/tests/relay_test.py b/tests/relay_test.py
new file mode 100755
index 0000000..68789b1
--- /dev/null
+++ b/tests/relay_test.py
@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+import time
+from panda import Panda
+
+p = Panda()
+
+while True:
+  p.set_safety_mode(Panda.SAFETY_TOYOTA)
+  p.send_heartbeat()
+  print("ON")
+  time.sleep(1)
+  p.set_safety_mode(Panda.SAFETY_NOOUTPUT)
+  p.send_heartbeat()
+  print("OFF")
+  time.sleep(1)
+