Audiovox MMD850 Manuel d'utilisateur télécharger pdf (Page 6)

4) Once the mounting location of the monitor has been determined, there may be

additional preparation work necessary, depending on the vehicle structure and

installation method. Some of the steps that may be required are:

A) Removal of the vehicle's dome light

B) If the trim ring will be used, it may have to be trimmed to fit the contour of the

vehicle's headliner. Refer to the "Trim Ring Installation" section in this manual.

Mounting the Trim Ring

Roof

Roof Support

Headliner

Mounting Bracket

Self-drilling Screws

Trim Ring

Video Unit

M4 Flange Nut

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 violet / 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.

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Audiovox MMD850 Manuel d'utilisateur Page 6