Rosen M10 Monitor/ Dual-Zone Controller Installation Manual page 11

Connecting to the Domelight Wiring in the Vehicle
The M10 has two domelight wires coming from the main unit. Remove the vehicle
domelight, find the vehicle domelight harness connector, and unplug it. Use a digital multi-
meter to test all the wires in the vehicle domelight connector, to determine which of the
following domelight wiring systems is being used.
Notes:
Many vehicles have domelight delay timers which keep the lights on for a few sec-
onds after the doors are closed, or which shut off the domelight after it has been on
for too long. Make sure these timers don't defeat your testing - occasionally turn the
ignition key on and off, and open and close all the doors.
The wire color and operation at the domelight is not always the same as the wiring in
the kick panel - alarm wiring information is often not accurate for these connections.
Always determine how the wires work at the domelight, not at the kick panel !
Negative door trigger systems have the following wires:
Constant 12V(+).
Negative door trigger. This will test as switched (-) ground when the doors are open,
and either 12V(+) or an open circuit when the doors are closed.
Constant ground. Note: This wire may not be present if the dome light grounds
through its mounting screws, or if it does not have an on/off switch built in.
Positive door trigger systems (many Ford and GM) have the following wires:
Constant Ground.
Note: This wire is not present if the domelight grounds through its mounting screws.
Positive door trigger. This will test as switched 12V(+) when the doors are open,
and either (-) ground or an open circuit when the doors are closed.
Constant 12V(+). Note: Only present if the dome light has an on/off switch built in.
Note: In some vehicles, you may not have displaced a dome light, or the dome light
circuit may not operate in one of the ways described above. If you choose to use the
lights as "map lights" only, not responding to the doors, connect Yellow and Black only.
Domelight Harness Connections:
Green wire to the vehicle (-) door trigger wire, or Purple wire to the (+) door trigger wire.
Note: If the Green wire is unused, you must cap it off to prevent it shorting to ground!
Yellow* wire to 12V(+) constant voltage (Note: in newer positive- trigger GM cars, do not
use the GM 12V constant orange domelight wire - use another source of 12V constant).
Black* wire - vehicle chassis (-) ground.
*Note: On M10, the Yellow and Black wires are with the Power harness - they are not with the
Green and Purple wires. If the Yellow Domelight 12V wire and the Yellow M10 Constant 12V wire
are connected to the same point, you may have audio noise issues while the domelight is on. To
avoid this, always connect this wire to another 12V Constant circuit in the vehicle.
Note: The domelight has a built-in five-minute limit timer . This is to prevent accidental
battery drain. To turn the domelight back on, press the domelight button again.
Rosen M10 Installation Guide 11