CDX-GT270MP, CDX-GT274MP, CDX-GT277ME, CDX-GT320MP - Sony Car Audio Service Manual (repair manual). Page 12

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CDX-GT270MP/GT274MP/GT277ME/GT320MP
CDX-GT270MP/GT274MP/GT277ME/GT320MP
12
12
(Korean model)
Notes on speaker connection
Before connecting the speakers, turn the unit off.
Use speakers with an impedance of 4 to 8 ohms, and with adequate 
power handling capacities to avoid its damage.
Do not connect the speaker terminals to the car chassis, or connect the 
terminals of the right speakers with those of the left speaker.
Do not connect the ground (earth) lead of this unit to the negative (–) 
terminal of the speaker.
Do not attempt to connect the speakers in parallel.
Connect only passive speakers. Connecting active speakers (with built-
in amplifiers) to the speaker terminals may damage the unit.
To avoid a malfunction, do not use the built-in speaker leads installed in 
your car if the unit shares a common negative (–) lead for the right and 
left speakers.
Do not connect the unit’s speaker leads to each other.
Note on connection
If speaker and amplifier are not connected correctly, “FAILURE” appears in 
the display. In this case, make sure the speaker and amplifier are 
connected correctly.
English
Cautions
This unit is designed for negative ground (earth) 12 V 
DC operation only.
Do not get the leads under a screw, or caught in moving 
parts (e.g. seat railing).
Before making connections, turn the car ignition off to 
avoid short circuits.
Connect the yellow and red power input leads only 
after all other leads have been connected.
Run all ground (earth) leads to a common ground 
(earth) point.
Be sure to insulate any loose unconnected leads with 
electrical tape for safety.
Notes on the power supply lead (yellow)
When connecting this unit in combination with other 
stereo components, the connected car circuit’s rating 
must be higher than the sum of each component’s fuse.
When no car circuits are rated high enough, connect the 
unit directly to the battery.
Connection example  (
)
Notes
Be sure to connect the ground (earth) lead before connecting the 
amplifier.
The alarm will only sound if the built-in amplifier is used.
Connection diagram (
)
To a metal surface of the car
First connect the black ground (earth) lead, then connect the  yellow, 
and red power supply leads.
To the power antenna (aerial) control lead or 
power supply lead of antenna (aerial) booster 
Notes
It is not necessary to connect this lead if there is no power antenna 
(aerial) or antenna (aerial) booster, or with a manually-operated 
telescopic antenna (aerial).
When your car has a built-in FM/AM antenna (aerial) in the rear/
side glass, see “Notes on the control and power supply leads.”
To AMP REMOTE IN of an optional power amplifier
This connection is only for amplifiers and a power antenna (aerial). 
Connecting any other system may damage the unit.
To the +12 V power terminal which is energized 
in the accessory position of the ignition key 
switch
Notes
If there is no accessory position, connect to the +12 V power 
(battery) terminal which is energized at all times. 
Be sure to connect the black ground (earth) lead to a metal surface 
of the car first.
When your car has a built-in FM/AM antenna (aerial) in the rear/
side glass, see “Notes on the control and power supply leads.”
To the +12 V power terminal which is energized 
at all times
Be sure to connect the black ground (earth) lead to a metal surface of 
the car first.
Notes on the control and power supply leads
REM OUT lead (blue/white striped) supplies +12 V DC when you turn on 
the unit.
When your car has built-in FM/AM antenna (aerial) in the rear/side 
glass, connect REM OUT lead (blue/white striped) or the accessory 
power supply lead (red) to the power terminal of the existing antenna 
(aerial) booster. For details, consult your dealer.
A power antenna (aerial) without a relay box cannot be used with this 
unit.
Memory hold connection
When the yellow power input lead is connected, power will always be 
supplied to the memory circuit even when the ignition switch is turned off.
(
)
A
B
*
2
REM OUT
Max. supply current 0.4 A
Fuse (10 A)
Blue/white striped
ACC
BATTERY
Red
Yellow
Black
White
Green
Purple
White/black striped
Gray/black striped
Green/black striped
Gray
Left
Right
Left
Right
Purple/black striped
from car antenna (aerial) 
*
Speaker impedance: 4 – 8 ohms × 4
*
RCA pin cord (not supplied).
*
AUDIO OUT can be switched SUB or REAR. For details, see the 
supplied Operating Instructions.
*
Separate adaptor may be required.
*
×
*
*
*
Front speaker
Subwoofer
Equipment used in illustrations (not supplied)
Power amplifier
Rear speaker
*
1
Fuse replacement  (
)
When replacing the fuse, be sure to use one matching the 
amperage rating stated on the original fuse. If the fuse blows, 
check the power connection and replace the fuse. If the fuse 
blows again after replacement, there may be an internal 
malfunction. In such a case, consult your nearest Sony 
dealer.
Notes on the tuning step
For how to set the tuning step, see the supplied Operating 
Instructions.
If replacing the car battery or changing the connections, 
the tuning step setting will be erased.
Mounting the unit in a Japanese 
car  (
)
You may not be able to install this unit in some makes of 
Japanese cars. In such a case, consult your Sony dealer.
Note
To prevent malfunction, install only with the supplied screws 
.
How to detach and attach the 
front panel  (
)
Before installing the unit, detach the front panel.
-A  To detach
Before detaching the front panel, be sure to press and hold 
. Press the front panel release button, and 
pull it off towards you.
-B  To attach
Engage part 
 of the front panel with part 
 of the unit, 
as illustrated, and push the left side into position until it 
clicks.
Warning if your car’s ignition has 
no ACC position
Be sure to set the Auto Off function. For details, see the 
supplied Operating Instructions.
The unit will shut off completely and automatically in the 
set time after the unit is turned off, which prevents battery 
drain.
If you do not set the Auto Off function, press and hold 
 until the display disappears each time you 
turn the ignition off.
(
)
(
)
° 
(
)
(
)
English
Precautions
Choose the installation location carefully so that the unit 
will not interfere with normal driving operations.
Avoid installing the unit in areas subject to dust, dirt, 
excessive vibration, or high temperatures, such as in direct 
sunlight or near heater ducts.
Use only the supplied mounting hardware for a safe and 
secure installation.
Mounting angle adjustment
Adjust the mounting angle to less than 45°.
Removing the protection collar 
and the bracket  (
)
Before installing the unit, remove the protection collar 
 and the bracket 
 from the unit.
Remove the protection collar 
.
Pinch both edges of the protection collar 
, then 
pull it out.
Remove the bracket 
.
  Insert both release keys 
 together between the 
unit and the bracket 
 until they click.
  Pull down the bracket 
, then pull up the unit 
to separate.
Mounting example  (
)
Installation in the dashboard
Notes 
Before installing, make sure that the catches on both sides of the 
bracket 
 are bent inwards 2 mm (
3
/
32
 in). If the catches are straight or 
bent outwards, the unit will not be installed securely and may spring 
out 
-1).
Bend these claws outward for a tight fit, if necessary 
-2).
Make sure that the 4 catches on the protection collar 
 are properly 
engaged in the slots of the unit 
-3).
Bracket
Bracket
Bracket
Bracket
A
TOYOTA
B
NISSAN
to dashboard/center console
to dashboard/center console
Existing parts supplied with your car
Existing parts supplied with your car
size  
5 × max. 8 mm
(
7
/
32
 × max. 
5
/
16
 in)
5 × 
8 mm
size  
5 × max. 8 mm
(
7
/
32
 × max. 
5
/
16
 in)
5 × 
 8 mm
size  
5 × max. 8 mm
(
7
/
32
 × max. 
5
/
16
 in)
5 × 
 8 mm
size  
5 × max. 8 mm
(
7
/
32
 × max. 
5
/
16
 in)
5 × 
 8 mm
1
2
Face the hook inwards.
A
B
Fuse (10 A)
Front panel release button
Claws 
2
3
1
Catch
182 mm (7 
1
/
4
 in)
53 mm (2 
1
/
8
 in)
Dashboard
Fire wall
Ver. 1.1
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