Kicker KEYLOC Manuel D'utilisation page 9

Connect the preamp-level RCA outputs to your
amplifier.
USB for internal use only
RCA Outputs (to amplifier)
Testing for DC Offset: If your head unit has a
remote output you can connect this to the remote
input of the KEYLOC. If your head unit does not have
a remote output, the KEYLOC can use the DC offset
that is present on the speaker outputs of most factory
head units. To measure for DC offset, connect your
voltmeter's negative lead to the vehicle's chassis
ground, the positive lead to the speaker wire you are
interfacing with, and set the voltmeter to 'DC volts'.
When the source unit you're using is on, you should
see DC voltage from between 2.5V–6V. The KEYLOC
will sense this DC offset to turn on, and output 12V
on its own remote output (up to 100mA) to turn on
your aftermarket amplifier(s). If tools are unavailable,
please see page 16.
This simple test will determine if you need to connect
the Remote Turn-On lead to a switched +12V DC
source, or if you can depend on DC Offset Turn-On
to turn the KEYLOC on and off.
English 8