When the ambiance temperature becomes extremely low or extremely high, AV control unit displays the message and limits the AV control unit function. FAIL‐SAFE CONDITIONS When the ambiance temperature is −20°C (−4°F) or lower, or when it is 70°C (158°F) or higher
Display
The messages displayed on fail-safe conditions are as shown below:

Fail-safe mode | Display (display of the fail-safe condition)
When HDD temperature is low | HDD system is experiencing problems due to extreme low temperature. Normal operation will resume when temperature rises.
When HDD temperature is high | HDD system is experiencing problems due to extreme high temperature. Normal operation will resume when temperature drops.

DESCRIPTION OF CONTROLS

Function | When Fail‐safe Function is activated
Air conditioner | Operation | Only multifunction switch (preset switch) can be operated.
Display |

- LED of multifunction switch (preset switch) illuminates.
- Aimed temperature, blow angle, and flow rate are displayed in simplified mode.

Audio | Operation | Only ON/OFF and volume control operations by multifunction switch (preset switch) are possible.
Display | No display (“Fail-safe mode” is displayed)
Hands-free phone | Operation | Cannot be operated.
Navigation | Operation | Cannot be operated.
Self diagnosis | The display in simplified mode of fail‐safe condition
CONSULT‐III diagnosis | Cannot be operated.

Ability Operation Mode
There is an ability operation mode for Fail‐safes due to low or high ambiance temperature.
If HDD data can be read, fail‐safe is shown, then normal displays are displayed only for functions which can be operated.
RELEASE CONDITIONS OF FAIL‐SAFE
Fail‐safe is released on following conditions and normal mode is restored.
When The Temperature of HDD Is Low or High
If the ambient temperature becomes out of fail-safe condition range, normal mode is restored.