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10 | OBD-II Smartbox | Product Use
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3.6 As power backup for ECU while re-
placing car battery
The OBD-II Smartbox also acts as a method to feed power to
the ECU. For the last 10 to 15 years, car ECUs were designed
to have Keep Alive Memory (KAM) chip that allows it to maintain
normal vehicle performances by compensating for sensors and
parts wears. This KAM chip needs power to store all the data
gathered and it will lost if power is disconnected. Therefore it
is essential to provide power to the ECU while replacing the
car battery.
Fig. 6:
Connecting OBD-II Smartbox as power backup
1.
Connect the OBD-II cable with battery clips to OBD-II Smartbox.
2.
Turn ignition key to OFF position and connect the tool to the
car DLC.
3.
Attach the battery clip to an external battery (not the battery
from the same car).
t
If the external battery voltage is above 12V, the battery volt
indicator LED on the Data saver cable will light up. Now it is
ready to proceed for replacing the car battery.
4.
After job done, remove the battery clips from the external
battery, unplug OBD-II Smartbox from the car.
t
The data saver cable comes with surge voltage protection,
short circuit and polarity protection.
3.� As DC power source for other devices
The OBD-II Smartbox can function as a power source for other
DC loads up to 5 Amps DC output at pin 4 (Ground) and pin16
(+) Socket.
While connected to the DLC, you can tap +12V or +24V depend-
ing on the power input at the DLC connector red banana socket
(pin 16) and Chassis Ground (-) at black banana socket (pin 4)
to power other DC loads. This voltage will also be displayed on
its digital display.
Fig. 7:
Use as a power source
