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Negative Switched Dome Lighting
Red / Black – Lamp on
Black / Red – Lamp common
Violet / Brown – Lamp Auto
Factory Door ajar
switch or Body
ADV850
To
constant
To
constant
CONNECTING THE DOME LIGHTS
The dome lights in the video monitor require three connections to the vehicle's
wiring. There are two common types of dome light circuits used, positive or negative
switched. Positive systems supply voltage to the interior lights to turn them on,
negative switched systems apply ground to illuminate the bulbs. To determine which
system you have you must locate the wires at the dome light. On a positive switched
system, with all the doors closed and the lights out, both wires at the dome light will
rest at ground. When the light is activated, one of these wires will switch to +12 vdc.
This is the vehicle's switching wire. On a negative switched system, with all the
doors closed and the lights out, both wires at the dome light will rest at + 12vdc.
When the light is activated, one of these wires will switch to ground. This is the
switching wire.
Positive Switched Dome Lighting
ADV850
Factory Dome Light Circuit
To
constant
+12vdc
Red / Black – Lamp on
Black / Red – Lamp common
Violet / Brown – Lamp Auto
To
constant
+12vdc
Factory Door ajar
switch or Body
Control computer