Autel PowerScan PS100 - Manual (Page 13)

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Figure 10
If the LCD readings are abnormal, there is a problem with this
sensor.
3.4 Activating Components in Your Hand
While the tool is in DC Voltage mode, by using the probe tip in
connection with the auxiliary ground lead, components can be
activated right in your hand, thereby testing their functions.
Connect the auxiliary ground lead to the negative terminal or ground
side of the component being tested. Then contact the probe tip to the
positive terminal of the component, the green LED should light,
indicating continuity through the component.
While keeping an eye on the green LED, quickly press and release
the power switch forward. If the green LED went out and the red
LED came on, you may proceed with further activation. Rock the
power switch forward and hold it down to provide power to your
component. With the power switch rocked forward, power will flow
from the positive lead on the battery into the probe tip, through the
tip into the component‟s positive terminal, into the component and
out of the component, through the auxiliary ground lead and back
into the tool, and back to the vehicle‟s battery‟s ground. (Figure 11)