Clarion OHM 633 Owner's Manual & Installation Manual

6.5" WIDESCREEN OVERHEAD COLOR LCD MONITOR

OHM 633

Owner's Manual / Installation Guide

6.5 INCH WIDE LCD MONITOR

OHM633

Warning!

THE CLARION OHM633 OVERHEAD VIDEO MONITOR IS
DESIGNED TO BE VIEWED BY REAR-SEAT OCCUPANTS
ONLY!

CLARION VIDEO PRODUCTS ARE NOT INTENDED FOR
VIEWING BY THE DRIVER WHILE THE VEHICLE IS IN MOTION.
SUCH USE MAY DISTRACT THE DRIVER OR INTERFERE WITH
THE DRIVER’S SAFE OPERATION OF THE VEHICLE, AND
THUS RESULT IN SERIOUS INJURY OR DEATH. SUCH USE
MAY ALSO VIOLATE STATE LAW.

CLARION DISCLAIMS ANY LIABILITY FOR ANY BODILY
INJURY, INCLUDING FATALITIES, OR PROPERTY DAMAGE
THAT MAY RESULT FROM ANY IMPROPER OR UNIN­TENDED USES OF THIS PRODUCT.

About Installation

Installation of mobile audio and video components requires
experience with a variety of mechanical and electrical proce­dures. Even though this manual provides general installation
and operation instructions for your new Clarion OHM633
Overhead Video Monitor, it does not show the exact installa­tion methods for your particular vehicle.

If you do not have the required knowledge and experience to
successfully complete the installation, we strongly recommend
consulting an authorized Clarion dealer about professional
installation options.

Table of Contents

1. Introduction .................................................................... 2

2. Care and Maintenance .................................................. 3

3. Using the OHM633 .......................................................... 3

5. The Remote Control ....................................................... 5

6. Installation and Wiring ................................................... 7

7. Troubleshooting ........................................................... 15

8. Specifications ............................................................... 15

2 OHM633

What is included with the OHM633







1.INTRODUCTION

The Clarion OHM633 is a high-performance video monitor
designed specifically for the mobile environment. It is
intended for use with other Clarion multimedia products, and
can also be integrated with many other products as part of a
complete mobile video solution. With two video inputs, the
OHM633 can support simultaneous connection to both
dedicated video source units and optional audio/video
components such as camcorders or videogames. The
infrared remote control receiver output allows integration with
select Clarion DVD and VHS source units.

The OHM633 automatically switches to operate with either
NTSC or PAL video signals (NTSC is the standard North
American video format).

The 16:9 aspect ratio screen allows DVD films to be viewed
in their original aspect ratio for the best cinematic experience.

Note:

The OHM633 is designed to be a component in a full audio/video
system. If you have any questions about compatible components,
such as system controllers, source units, FM modulators, or
other audio/video products, please contact your authorized
Clarion dealer.

● 1 x OHM633 overhead monitor unit

● 1 x Soft trim ring

● 1 x Mounting bracket

● 1 x Remote control

● 2 x A/V wiring harness

● 1 x Power supply harness

● 2 x Battery AAA

● 4 x Screws M5 x 30

● 1 x Warranty card

● 1 x Owner’s Manual / Installation Guide

OHM633 3

Liquids and the OHM633

Keep all liquids, including beverages and cleaning liquids,
away from the OHM633. Liquids inside the monitor can
damage the electronics, and result in electrical shock or fire.
If the unit should become wet, turn off all power and contact
an authorized Clarion dealer to have the monitor inspected.

Servicing the OHM633

In the event that trouble arises, never open the case or
disassemble the unit. The internal parts are not serviceable
by the user. Opening any components will void the warranty.

CAUTION!

Changes or modifications to this product not
approved by the manufacturer will void the
warranty.

ACC or engine
ON position

Deploying the fold-down monitor

1 Slide the release latch in the direction of the arrow on the

In order to operate the OHM633, the vehicle ignition key
switch must be in the ACC or RUN position.

To prevent the battery from going dead,
operate this unit with the engine
running, if possible.

latch. The monitor will deploy about one inch.

Release

Latch

2. CARE AND MAINTENANCE 4. USING THE OHM633

WARNING!

4 OHM633

2 Pull the monitor down into the viewing position. Grasp the

monitor by the edges - do not press on the screen.

Using the dome lights

The OHM6

The OHM633 comes with a remote control, that is required
for basic operation of the monitor.The OHM633 also supports
the remote controls of selected optional Clarion multimedia
source units.This allows the user to control the source unit
with the source unit remote, even if the source unit is mounted
out of sight in a trunk or under a seat.

To prevent the battery from going dead,
do not leave the dome light switch in the
ON position for long periods of time
without the engine running.

33 has built-in dome lights which may replace the
original ceiling-mounted lights in some installations. These
lights illuminate when the doors are open and go out when
the doors are closed (some vehicles have domelight-delay
systems that keep the light illuminated for a few seconds
after the doors are closed). The OHM633’s lights may be
manually turned on and off with a sliding switch built into the
monitor.

Dome

Light
Sliding
Switch

Dome lights

Optional Infrared Wireless Headphones

The OHM633 has a built-in infrared audio transmitter to
accomodate optional wireless headphones.

Using the Remote Control

Dome Light Switch Positions:

On - ON, left position
Door-controlled - Center position
Off - OFF, right position

WARNING!

OHM633 5

Note:

 ● The OHM633 remote is always required to control the monitor -

source unit remote controls do not operate the OHM633.

To use remote controls with the OHM633, point the remote at
the face of the deployed screen when pressing the buttons.

The RCBOHM633 Remote Control

Before use, the 2 (AAA) batteries included must be inserted
into the remote control. Make certain that the batteries are
inserted according to the (+) and (-) marks on the inside of
the battery compartment.

Slide the battery door off and insert the batteries as shown.

+

+

+

+

-

-

-

-

Notes:

● The batteries should last about 6 months in normal use. Remove

leaking batteries immediately. Store the remote in a cool dark
place when not in use.

PICTURE

POWER AV1/AV2

ADJUST UP

ADJUST DOWN

POWER SOURCE

WIDE/NORMAL

The [POWER] button turns the OHM633 on and off.

Notes:

 ● Even after the OHM633 is switched on, the screen remains dark

until a video signal is detected.

 ● When the ignition switch is turned off, the OHM633 automatically

shuts off. The next time the ignition switch is turned on, the
OHM633 will remain off until the [POWER] button is pressed.

The [SOURCE] button selects between the two sets of audio/
video inputs of the OHM633.

Note:

● If only one of the inputs is used, the screen will remain dark when

the unused input is selected.

WIDE/NORMAL

PICTURE
SELECT

OHM633

6 OHM633

The [WIDE/ NORMAL] button changes the display mode from
“wide” 16:9 mode to “normal” 4:3 mode.

Note:

● When using a DVD player as the source unit, make sure that the

DVD player’s output mode is set to “Wide” or “16:9”, so that it will
generate a video signal that can take advantage of the OHM633’s
aspect ratio. When using this display with sources that generate
a “normal”, 4:3 image signal, such as videogames and videocas­sette players, the [WIDE/NORMAL] button will “stretch” the
image to fit the screen. In this case, some minor image distortion
may be visible.

The [PICTURE] button accesses the display adjustment
menus. Each time this button is pressed, the unit will step to
the next setting mode, and the screen will display the value of
the selected setting. These adjustment settings are:

Brightness
Contrast
Color
Tint (For PAL system.TINT control is dummy.)
Mem Reset (resets above to original values)

Change the value of each setting by pressing the [+] and [

-]

buttons. Each setting has 42 steps of adjustment range.

BRIGHTNESS

COLOR

CONTRAST

TINT

MEM RESET

Notes:



●

When the “MEM RESET” option is displayed on the screen,
pressing either the [+] or [-] buttons will reset all settings to
their original factory values. If you do not wish to reset the
settings, either press the [PICTURE] button again, or wait for the
monitor to exit the picture adjustment mode automatically.



●

If the “MEM RESET” option is used and the OHM633 is set to
Source 2, the monitor will revert to the default setting of Source 1.
If there is no active input on Source 1, the screen may go dark. If
this happens, press the [SOURCE] button to switch the monitor
back to Source 2.

4:3 16:9

OHM633 7

1. Before Starting

Read these instructions and the following precautions
carefully.

Precautions

● This unit is exclusively for cars with a negative ground, 12V

power supply.

● Do not open the case. There are no user-serviceable parts

inside. If you require asistance, consult your Clarion dealer
or an authorized Clarion service center.

● Use a soft, dry cloth to clean the screen. Never use a

rough cloth, thinner , benzene, alcohol, or other solvent. The
screen surface is easy to scratch - do not rub when cleaning.

2. Installation Requirements

6. INSTALLATION AND WIRING

WARNING!

Be sure to disconnect the battery (-)
terminal before starting. This is to
prevent short circuits during installation.

WARNING!

Never install this monitor where it is
visible from the driver’s seat, or where it
could injure any vehicle occupant in
case of an accident. Ensure that your
installation does not create risk of head­strike injury, and that the monitor will
remain securely mounted in the case of
an accident or sudden maneuver.

8 OHM633

3. Installing the OHM633

Prepare the vehicle for installation by carefully removing
vehicle interior trim panels as necessary. Route wire har­nesses away from sharp edges, and ensure that no har­nesses will be pinched or pierced during reassembly.

Temporarily remove the OHM633 dome light lenses and
bulbs, so that the rear mounting screws can be accessed.

Note:

The wiring of the OHM633 must be completed, and the wiring

harness plugged in, prior to the final installation of the monitor
into the ceiling. However, since some vehicles will require
custom work or other modifications, this manual discusses
physical installation first. Always complete your wiring before
final assembly of the monitor into the ceiling of the vehicle.

Selecting the Monitor Location

Location of the overhead monitor varies by vehicle, but is
typically on the center line of the vehicle and just aft of the front
seats, often displacing the factory dome light. Always install
the overhead console to the existing roof cross beams.

Before you begin installation of the overhead console, remove
the vehicle dome light and partially drop the headliner to verify
that you have sufficient clearance and access to a roof beam.

Note:

In many vehicles, the OHM633 will displace the original dome

light - for this reason, the OHM633 has dome lights built in which
can replace the original lights.

The Installation Process

WARNING!

Never install any overhead monitor
such as to create a potential head strike
danger for the vehicle occupants. Avoid
mounting it too far forward in the vehicle

- always ensure that the front-seat
occupants cannot hit their heads on a
monitor when it is deployed.

WARNING!

Make sure that the screws you use to
mount the bracket, monitor, or optional
spacer are not too long! If the screws
are too long, they could damage the roof
of the vehicle. Take great care when
planning this part of the installation.

1. Remove the vehicle dome light and the trim on the
outer edges of the headliner. Determine the location
of the roof beam(s), which will help you determine
the monitor location. Ensure that the installation

can be successfuly completed before continuing!

OHM633 9

2. Determine if the mounting bracket can be attached to the
roof beam through the dome light opening in the head­liner. This depends on the amount of space between the
headliner and the roof beam.

Exploded view - mounting through dome light opening

Roof

Roof Beam

Screws

Overhead Monitor

Screws

Headliner

Mounting

Bracket

Front of vehicle

Opening in headliner for dome light

Note:

● If there is too much space between the roof beam and the

headliner, the headliner could crush and wrinkle when the
monitor and bracket are assembled. Verify all clearances to
prevent damage to the vehicle or the interior trim!

3. A mounting spacer may be used to strengthen the
installation and to take up any gap between the headliner
and the roof beam. Screw the spacer to the roof beam,
and screw the bracket to the spacer.

Exploded view - mounting using a spacer:

Roof

Optional Spacer Material

(Installer Provided)

Screws

Roof Beam

Screws

Overhead Monitor

Screws

Headliner

Mounting

Bracket

Front of vehicle

Opening in headliner for dome light

10 O HM633

4. In some installations, the vehicle headliner must
modified, and the bracket must be sandwiched between
the headliner and the roof. If the headliner must be

modified, ensure that the opening will be smaller than
the footprint of the OHM633. If modifying the headliner,

cut the headliner using a knife with a sharp blade.

Exploded view - mounting w/bracket above headliner:

Roof

Optional Spacer Material

(Installer Provided)

Headliner

Screws

Roof Beam

Screws

Overhead Monitor

Screws

Enlarged
opening
in headliner

Bracket

Front of vehicle

5. When you have determined the type of installation you will
be performing and made any needed modifications,
install the wiring harnesses as needed and plug them
into the monitor. Deploy the monitor to access the front
two screw openings, and remove the dome light lenses
and bulbs to access the rear two openings. Install the
monitor into the vehicle. Hand-tighten the screws - do

not overtighten!

Vehicle Roof

Headliner

Mounting screws

Optional spacer

Mounting

bracket

above

monitor

Soft
trim

ring

WARNING!

Make sure that the screws you use to
mount the bracket, monitor, or optional
spacer are not too long! If the screws
are too long, they could damage the roof
of the vehicle.

OHM633 11

5. Wiring the OHM633

The following pages display wiring diagrams for various
OHM633 configurations.

Read the following precautions before wiring your system.

 Disconnect the negative battery terminal before making

any wiring connections.

 Be particularly careful where you route wires. Keep them

away from the engine, exhaust system, etc. Heat may
damage wires. Sharp edges can pierce wire insulation
and cable jackets, causing short circuits, damage to the
vehicle, blown fuses, and system failure.

 If the fuse should blow, make sure all connections are

correct and no wires are damaged before replacing the
fuse. Always use fuses that are the same amperage value
as the original. When replacing a fuse, never let the battery
side touch any metal part or any other wire.

OHM633 wiring harnesses:

IR output

Video

input 1

DIN cable 1

Blac k ­Ground

Red
+12V
Accessory

Audio input 1

(for IR
headphone
transmitter)

DIN cable 2

IR output

input 2

Audio input 2

(for IR

headphone

transmitter)

DIN Connector pin assignments

Pi n Description

1 DC 12V (+) ACC
2 Infrared receiver signal
3 DC Ground (-)
4 Video signal in
5 A/V signal ground
6 Audio R signal in
7 Not used
8 Audio L signal in

1

2

3

4

5

6

7

8

Note:

 For dome light wiring connections, see page 14.

Data

Data

12 O HM633

OHM633 with VS738 DVD

DVD

VCD

CD

MP3

DOLBY
DIGITAL

REMAIN
ANGLE

CHP

TRK

A

B

REPE AT
TITLE

SCN
RDM

L/R

POWER

OPEN

VS 738 DVD

Blac k ­Ground

DIN cable 1

Red
+12V
Accessor y

DIN

cable

2

DIN cable 1

IR output

Video

input 1

Audio input 1

(for IR
headphone
transmitter)

OHM633 13

OHM633 with VS738 DVD

DVD

VCD

CD

MP3

DOLBY
DIGITAL

REMAIN
ANGLE

CHP

TRK

A

B

REPE AT
TITLE

SCN
RDM

L/R

POWER

OPEN

VS 738 DVD

GAME CONSOLE

Blac k ­Ground

DIN cable 1

Red
+12V
Accessory

DIN

cable

2

DIN cable 1

IR output

Video

input 2

Audio input 2

(for IR
headphone
transmitter)

DIN cable 2

IR output

Video

input 1

Audio input 1

(for IR
headphone
transmitter)

14 O HM633

Dome Light Wiring Connections:

Negative-trigger dome light system:

Negative-trigger OHM 633 dome light wiring:

Original
Factory

Domelight

Bulb

12V (+) to Bulb
from fuse box
OR
vehicle domelight
control system

(-) Output from door jamb
pin switch, OR
(-) output from vehicle
domelight control system

Domelight
connector

(-) Ground

Original
Factory

Domelight

Bulb

12V (+) to Bulb
from fuse box
OR
vehicle domelight
control system

White wire,
OHM 633

OHM 633

OHM 633

Brown wire,

(-) Output from door jamb
pin switch, OR
(-) output from vehicle
domelight control system

Domelight
connector

Gray wire,

(-) Ground

(-) Ground

Positive-trigger dome light system:

Positive-trigger OHM 633 dome light wiring:

Original
Factory

Domelight

Bulb

12V (+)
Constant

(-) Constant ground, OR

output from vehicle domelight

control system

Domelight
connector

(-) Ground

12V (+) switched output when door

is open (output is either from the

door pin switch OR the vehicle

domelight control system).

Original
Factory

Domelight

Bulb

12V (+)
Constant

White wire,

Brown wire,

(-) Constant ground, OR

output from vehicle domelight

control system

Domelight
connector

Gray wire,

(-) Ground

12V (+) switched output when door

is open (output is either from the

door pin switch OR the vehicle

domelight control system).

OHM 633

OHM 633

OHM 633

OHM633 15

6. TROUBLESHOOTING

No picture.

Press the [POWER] and [SOURCE] buttons to make sure the
monitor is on and the proper input is selected.

If there is still no picture, press the [PICTURE ] button. If the

menu appears, check the source unit and video connections.
If no menu appears, check all fuses and power connections

to the OHM633 and the associated equipment.

Note:

● The OHM633 has an operating temperature range of

-10o C to 60o C (14o F to 140o F). If the temperature is outside
this operating range, the unit will not turn on, or the screen
may be slow to react to image changes. The monitor will
function normally once it returns to its proper operating
temperature range.

With a DVD player and a widescreen DVD disc, there are
black bars on the screen.

Change the TV display mode to “Wide” in the DVD player’s
Setup menu.

After changing this setting, if there are still black bars, press
the [WIDE/NORMAL] button on the OHM633 remote control.

7. SPECIFICATIONS

Supply voltage: 12V DC (10V-16V)

Test voltage: 12V, negative ground

Current consumption: Less than 1.0 Amps

Operating T emperature: -10o C to 60o C (14o F to 140o F)

Signal system: NTSC and PAL composite video 1.0V p-p

Screen: 6.5” diagonal, 144.4mm x 80.3 mm.

Resolution: 1200 x 234 (280,800 dots)

Weight: 2.2 lb, 1.0 kg

Note:

● The technical data and the design of the equipment may change

for the sake of technical improvements without prior notice.

Clarion Co., Ltd.
Made in Taiwan

2003 Clarion Corporation
All rights reserved. This material may not be reproduced or copied, in
whole or in part, without the written permission of Clarion Corporation.

www.clarion.com