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CQ-R253U

Installation Guide

CQ-R253U

WARNING

This installation information is designed for experienced installers and is not
intended for non-technical individuals. It does not contain warnings or cautions of
potential dangers involved in attempting to install this product.

Any attempt to install this product in a motor car by anyone other than qualified
installer could cause damage to the electrical system and could result in serious
personal injury or death.

❏

Installation Hardware

❏

Overview

This product should be installed by a professional.
However, if you plan to install this product yourself,
your first step is to decide where to install it. The
instructions in these pages will guide you through the
remaining steps:
(Please refer to the “WARNING” statement above.)

• Identify and label the car wires.
• Connect the car wires to the wires of the power

connector.

• Install the unit in the dashboard.
• Check the operation of the unit.

If you encounter problems, please consult your nearest
professional installer.

Before you begin installation, look for the items which
are packed with your unit.

• Warranty Card…Fill this out promptly.
• Panasonic Servicenter List for Service Directory

…Keep for future reference in case the product
needs servicing.

• Installation Hardware…Needed for in-dash

installation.

❏

Required Tools

You’ll need a screwdriver, a 1.5 V AA battery, and the
following:

Caution:
• This unit operates with a 12 V DC negative ground

auto battery system only. Do not attempt to use it
in any other system. Doing so could cause
serious damage.

12 V DC

Test bulb

Electrical tape

Side-cut

pliers

❏

Identify All Leads

The first step in installation is to identify all the car
wires you’ll use when hooking up your sound system.
As you identify each wire, we suggest that you label it
using masking tape and a permanent marker. This will
help avoid confusion when making connections later.

Note: Do not connect the power connector to the
stereo unit until you have made all connections. If there
are no plastic caps on the stereo hooking wires, insulate
all exposed leads with electrical tape until you are ready
to use them. Identify the leads in the following order.

Power Lead
If your car has a radio or is pre-wired for one:
Cut the connector wires one at a time from the plug
(leaving the leads as long as possible) so that you can
work with individual leads.

Turn the ignition on to the accessory position, and
ground one lead of the test bulb to the chassis.

Touch the other lead of the test bulb to each of the
exposed wires from the cut radio connector plug. Touch
one wire at a time until you find the outlet that causes
the test bulb to light.

Now turn the ignition off and then on. If the bulb also
turns off and on, that outlet is the car power lead.

If your car is not wired for an audio unit:
Go to the fuse block and find the fuse port for radio
(RADIO), accessory (ACC), or ignition (IGN).

Battery Lead
If your stereo unit has a yellow lead, you will need to
locate the car’s battery lead. Otherwise you may ignore
this procedure. (The yellow battery lead provides
continuous power to maintain a clock, memory storage,
or other function.)

If your car has a radio or is pre-wired for one:
With the ignition and headlights off, identify the car
battery lead by grounding one lead of the test bulb to
the chassis and checking the remaining exposed wires
from the cut radio connector plug.

If your car is not wired for an audio unit:
Go to the fuse block and find the fuse port for the
battery, usually marked BAT.

Speakers
Identify the car speaker leads. There are two leads for
each speaker which are usually color coded.
A handy way to identify the speaker leads and the
speaker they are connected with is to test the leads
using a 1.5 V AA battery as follows.
Hold one lead against one pole of the battery and stroke
the other lead across the other pole. You will hear a
scraping sound in one of the speakers if you are holding
a speaker lead.
If not, keep testing different lead combinations until you
have located all the speaker leads. When you label them,
include the speaker location for each.

Antenna
The antenna lead is a thick, black wire with a metal plug
at the end.

❏

Connect All Leads

Now that you have identified all the wires in the car, you
are ready to begin connecting them to the stereo unit
wires. The wiring diagram (

➡

page 28) shows the

proper connections and color coding of the leads.
We strongly recommend that you test the unit before
making a final installation.
You can set the unit on the floor and make temporary
connections to test the unit. Use electrical tape to cover
all exposed wires.

Ground
Connect the black ground lead of the power connector
to the metal car chassis.

Important: Connect the red power lead last, after
you have made and insulated all other connections.

Q’ty

Item

No.

Diagram

Mounting collar

Hex. nut (5 mmø)

Rear support strap

Tapping screw
(5 mmø

16 mm)

Mounting bolt (5 mmø)