diff --git a/meta-zaius/recipes-phosphor/chassis/avsbus-control/avsbus-disable@.service b/meta-zaius/recipes-phosphor/chassis/avsbus-control/avsbus-disable@.service
new file mode 100644
index 0000000..f9fd425
--- /dev/null
+++ b/meta-zaius/recipes-phosphor/chassis/avsbus-control/avsbus-disable@.service
@@ -0,0 +1,13 @@
+[Unit]
+Description=Disable AVSBus on VRMs
+Wants=obmc-power-stop-pre@%i.target
+Before=obmc-power-stop-pre@%i.target
+Conflicts=obmc-chassis-start@%i.target
+
+[Service]
+ExecStart={bindir}/zaius_avsbus.sh disable
+Type=oneshot
+RemainAfterExit=yes
+
+[Install]
+WantedBy=obmc-chassis-stop@%i.target
diff --git a/meta-zaius/recipes-phosphor/chassis/avsbus-control/avsbus-enable@.service b/meta-zaius/recipes-phosphor/chassis/avsbus-control/avsbus-enable@.service
new file mode 100644
index 0000000..58f29d3
--- /dev/null
+++ b/meta-zaius/recipes-phosphor/chassis/avsbus-control/avsbus-enable@.service
@@ -0,0 +1,13 @@
+[Unit]
+Description=Enable AVSBus on VRMs
+Wants=obmc-host-start-pre@%i.target
+Before=obmc-host-start-pre@%i.target
+Conflicts=obmc-chassis-stop@%i.target
+
+[Service]
+ExecStart={bindir}/zaius_avsbus.sh enable
+Type=oneshot
+RemainAfterExit=yes
+
+[Install]
+WantedBy=obmc-chassis-start@%i.target
diff --git a/meta-zaius/recipes-phosphor/chassis/avsbus-control/zaius_avsbus.sh b/meta-zaius/recipes-phosphor/chassis/avsbus-control/zaius_avsbus.sh
new file mode 100755
index 0000000..c946179
--- /dev/null
+++ b/meta-zaius/recipes-phosphor/chassis/avsbus-control/zaius_avsbus.sh
@@ -0,0 +1,77 @@
+#!/bin/sh -e
+# AVSBus control for PMBUS voltage regulator modules (VRMs)
+# Switches output voltage target between
+# - VOUT_COMMAND register (AVSBus disabled, default on Zaius)
+# - AVSBus target output (AVSBus enabled, voltage set by host)
+
+cpu0_i2c_bus="7"
+cpu1_i2c_bus="8"
+busses="$cpu0_i2c_bus $cpu1_i2c_bus"
+vdd_i2c_addr_page="0x60:0x01"
+vdn_i2c_addr_page="0x64:0x01"
+vcs_i2c_addr_page="0x64:0x00"
+addrs_pages="$vdd_i2c_addr_page $vdn_i2c_addr_page $vcs_i2c_addr_page"
+
+# Usage: vrm_set_page <bus> <i2c_address> <page>
+vrm_set_page()
+{
+    i2cset -y $1 $2 0x00 $3 b
+}
+
+# Usage: vrm_avs_enable <bus> <i2c_address> <page>
+# Sets OPERATION PMBUS register to
+# - Enable/Disable: On
+# - VOUT Source: AVSBus Target Rail Voltage
+# - AVSBus Copy: VOUT_COMMAND remains unchanged
+vrm_avs_enable()
+{
+    vrm_set_page "$@"
+    echo Enabling AVSBus on bus $1 VRM @$2 rail $3...
+    i2cset -y $1 $2 0x01 0xb0 b
+}
+
+# Usage: vrm_avs_disable <bus> <i2c_address> <page>
+# Sets OPERATION PMBUS register to
+# - Enable/Disable: On
+# - VOUT Source: VOUT_COMMAND
+# - AVSBus Copy: VOUT_COMMAND remains unchanged
+vrm_avs_disable()
+{
+    vrm_set_page "$@"
+    echo Disabling AVSBus on bus $1 VRM @$2 rail $3...
+    i2cset -y $1 $2 0x01 0x80 b
+}
+
+# Usage: vrm_print <bus> <i2c_address> <page>
+vrm_print()
+{
+    vrm_set_page "$@"
+    local operation=`i2cget -y $1 $2 0x01 b`
+    local vout=`i2cget -y $1 $2 0x8b w`
+    local iout=`i2cget -y $1 $2 0x8c w`
+    echo VRM on bus $1 @$2 rail $3: OPERATION=$operation VOUT=$vout IOUT=$iout
+}
+
+# Usage: for_each_rail <command>
+# <command> will be invoked with <bus> <i2c_address> <page>
+for_each_rail()
+{
+    for bus in $busses
+    do
+        for addr_page in $addrs_pages
+        do
+            $1 $bus `echo $addr_page | tr : " "`
+        done
+    done
+}
+
+if [ "$1" == "enable" ]
+then
+    for_each_rail vrm_avs_enable
+elif [ "$1" == "disable" ]
+then
+    for_each_rail vrm_avs_disable
+else
+    for_each_rail vrm_print
+    echo "\"$0 <enable|disable>\" to control whether VRMs use AVSBus"
+fi