ZDX V6-3.7L (2010)
Fail-Safe Function
To prevent improper operation, the MICUs have a fail-safe function. In the fail-safe mode, the output signal is fixed when any part of the system
malfunctions (for example, a faulty control unit or communication line).
Each control unit has a hardware fail-safe function that fixes the output signal when there is a CPU malfunction, and a software fail-safe function that
ignores the signal from a malfunctioning control unit, which allows the system to operate normally.
Hardware Fail-Safe Control
When a CPU problem or an abnormal power supply voltage is detected, the MICUs move to the hardware fail-safe mode, and each system output load is
set to the pre-programmed fail-safe value.
Software Fail-Safe Control
When any of the data from the B-CAN circuit cannot be received within a specified time, or an unusual combination of data is recognized, the MICUs
move to the software fail-safe mode. The data that was not received is then assigned a pre-programmed fail-safe value.
Driver's MICU
Power Supply Voltage Monitoring Function
The driver's MICU monitors the power supply voltage (back-up voltage). If the voltage goes below 10 V, the driver's MICU will not store a DTC.
Entry Lights Control System (Ceiling Lights, Map Lights, Ignition Key Light)*
The driver's MICU control of the interior light ON/OFF is based on inputs from each switch.
Collision Detection Signal (CDS)
The driver's MICU control of the door lock actuators is based on IG1 and SRS (CDS) inputs.
Key Interlock
The driver's MICU control of the key interlock solenoid is based on ignition switch ACCESSORY (I) position, the transmission range switch P position,
and the park pin switch inputs.
