If certain keys on your VVX 400 are not responding as expected, a quick test can be run to verify the key mappings are correct and that the button itself is not broken.  If no key code is returned when pressing a button, the phone likely has a hardware failure.  If incorrect codes or functions are returned, the phone likely needs to be reset to factory and re-configured to reset the key mappings.


From the phone's Home screen, Navigate to the diagnostics page:  Settings, Status, Diagnostics, Test Hardware, Keypad Diagnostics:


Left Line Keys (Top to Bottom)

Key 51 - Line 1

Key 32 - Line 2

Key 33 - Line 3

Key 34 - Line 4

Key 52 - Line 5

Key 53 - Line 6


Right Line Keys (Top to Bottom)

Key 54 - Line 7

Key 35 - Line 8

Key 36 - Line 9

Key 37 - Line 10

Key 55 - Line 11

Key 56 - Line 12


Softkeys (Left to Right)

Key 29 - Softkey 1

Key 28 - Softkey 2

Key 27 - Softkey 3

Key 31 - Softkey 4


Navigation Keys

Home   - Key 26

Up     - Key 12

Down   - Key 11

Left   - Key 3

Right  - Key 4

Select - Key 18


Main Dialpad

1 - Key 25 - Dialpad 1

2 - Key 2  - Dialpad 2

3 - Key 5  - Dialpad 3

4 - Key 8  - Dialpad 4

5 - Key 9  - Dialpad 5

6 - Key 40 - Dialpad 6

7 - Key 15 - Dialpad 7

8 - Key 16 - Dialpad 8

9 - Key 17 - Dialpad 9

* - Key 22 - Dialpad Star

0 - Key 23 - Dialpad 0

# - Key 24 - Dialpad Pound


Left Function Keys (Top to Bottom)

Key 20 - Transfer

Key 21 - Messages

Key 19 - Hold


Right Function Keys (Top to Bottom)

Key 10 - Headset

Key 13 - Handsfree

Key 14 - Mute


HookSwitch - Key 254