Audiovox VDS102T Installation Guide download pdf (Page 10)

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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. For positive systems, connect the purple / brown (Lamp

auto) wire to the vehicle's switched wire. Then connect the red / black (lamp on) wire to a fused constant 12 volt

source and the black / red (lamp common) wire to a good ground. Positive systems are commonly found on Ford

vehicles. For negative systems, connect the purple / brown (Lamp auto) wire to the vehicle's switched wire.

Then connect the red / black (lamp on) wire to a good ground and the black / red (lamp common) wire to fused

constant 12 volt source. Negative systems are commonly found on General Motors and import vehicles.

Some vehicles which incorporate transistorized control of the dome light circuit, such as the 1999 Dodge

Caravan, may require that the purple / brown (Lamp auto) wire be connected to the door pin switch wire, as the

additional current draw of the Monitor's lights may not be supported by the output of the vehicles body control

computer.

Note:

Positive Switched Dome Lighting

Red / black - Lamp on

To 12 pin

connector

on Monitor

constant

+12vdc

constant

+12vdc

Black / red - Lamp common

Purple / brown - Lamp Auto

Factory Door ajar

switch or Body

Control computer

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Audiovox VDS102T Installation Guide Page 10