Training Center of After-Sales Department Chery International
7. Electric rearview mirror
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2. System elements introduction
Functions description :
The rear defroster can be only activated when all of following conditions are met:
(1) IGN-ON
(2) Rear defroster switch on AC panel is pressed when the rear defroster is deactivated.
BCM engages the external relay via inner low-side drive, and the rearview mirror and rear
windshield defroster heating resistor start to work. After the defroster is activated for 20min.,
BCM will automatically turn off the output, with the pin at high resistance and relay
disconnected.
If this function is activated, CAN signal Rear Dfst Cmd=1 will be sent to power train CAN,
and Rear Dfst Sts=1 sent to body CAN.
System safety protection:
When the battery voltage remains lower than 11.5V for 5s, BCM will disconnect the control
terminal of the relay. When the voltage is restored to 12.5V and this voltage is maintained
for 15s, the system will be recovered.
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