POWER CUT OFF CONTROL: System Description: Description
Because EV uses high voltage power, there is a risk of electric shock if the high voltage circuit is shorted to a body ground during a collision. To avoid such risks, if VCM detects a car crush information signal, VCM deactivates the system main relay to cut off the Li-ion battery from the high voltage circuit so that the risk of electric shock is reduced.
When detecting a serious collision
When receiving a car crash information signal from the air bag diagnosis sensor unit, VCM turns OFF the system main relay and quickly interrupts the high voltage circuit. In addition, VCM detects DTC P3137 and prohibits the READY operation until the DTC is erased.
When detection a minor collision
When receiving a light crash judgment signal from the air bag diagnosis sensor unit, VCM turns OFF the system main relay and quickly interrupts the high voltage circuit. The READY operation becomes possible after a lapse of 90 seconds or more (VCM performs self shut-off) after the power switch is turned OFF.
- The collision detection level of VCM may differ from an actual vehicle damage state.
- When a collision occurs more than once during the same trip (no history of turning OFF the power switch), VCM judges "detection of serious collision" and prohibits the READY operation.
| Collision status | Detected DTC | CONSULT data monitor screen | Reset | |
|---|---|---|---|---|
| Item | Indication | |||
| Serious | P3137 | CLASH DETECT INFO | HEAVY | "DTC LOGIC " |
| MID | ||||
| Minor | P3135 | LIGHT CRASH JUDGMENT | On | After maintaining the power switch OFF state (self shut-off) for 90 seconds or more, perform the READY operation.
CAUTION:
When bringing VCM into self shut off, never perform vehicle handling such as opening and closing of doors while the power switch is OFF. If some kind of vehicle handling is performed, then wait another 90 seconds or more from the time of the vehicle handling.
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