XM-S400D - Sony Car Audio Service Manual (repair manual). Page 3

This section is extracted 
from instruction manual.

ˋ The unit will not come into contact with a 

driver/passengers or materials in your car since 
the unit becomes hot during use.

ˎ Do not install the unit under the floor carpet, 

where the heat dissipation from the unit will be 
considerably impaired. 

Prepare a mounting board that is thicker than 20 
mm (

13

/

16

 in) since the supplied mounting screws 

ͬ are all 20 mm (

13

/

16

 in) long. The unit can also be 

mounted on the flat surface of your car without a 
mounting board.

1

Insert the supplied mounting brackets 

ͪ 

into the slits of the unit and secure them 
with the supplied bracket screws 

ͫ.

2

Place the unit on the mounting board 
and mark the two screw hole positions.

3

Drill a 3 mm (

1

/

8

 in) pilot hole at each 

mark on the mounting board.

ʘ

ʗ

ʘ

ʗ

Installation

ˎ Mount the unit on a flat surface.

ˎ Mount the unit where

ˋ The unit will not interfere with the normal 

movements of the driver.

ˋ The unit will not be exposed to direct sunlight 

or hot air from the heater.

ˎ Connect the +12 V power supply wire only after all 

the other wires have been connected and the 
settings on this unit have been made.

ˎ Be sure to connect the ground (earth) wire of the 

unit securely to a metal point of the car. A loose 
connection may cause a malfunction of the 
amplifier. 

ˎ Be sure to connect the remote control wire of the 

car audio unit to the remote input (REM) wire of 
the supplied power connection cable.

ˎ When using a car audio unit without a remote 

output for the amplifier, connect the remote input 
(REM) wire of the supplied power connection 
cable to the accessory power supply.

ˎ Use a power supply wire with a fuse (15 A) 

attached. 

ˎ All power wires connected to the positive battery 

post should be fused within 450 mm (17 

3

/

4

 in) of 

the battery post, and before they pass through 
any metal.

ˎ Make sure that the car’s battery wires connected 

to the car (ground (earth) to chassis) are of a wire 
gauge at least equal to that of the main power 
wire connected from the battery to the amplifier. 

ˎ During full-power operation, a current of more 

than 15 A will run through the system. Therefore, 
make sure that the wires to be connected to the 
+12 V and GND wires of this unit are at least 14-
Gauge (AWG-14) or have a sectional area of more 
than 2 mm² (

3

/

32

 in²).

Power Connections

4

Place the unit on the mounting board 
and secure it with the supplied mounting 
screws 

ͬ.

Connections

ˎ Before making any connections, disconnect the 

ground (earth) terminal of the car battery to avoid 
short circuits.

ˎ If your car is equipped with a computer system for 

navigation or some other purpose, disconnecting 
the ground (earth) wire from the car battery may 
damage the computer memory. Leaving the 
ground (earth) wire connected and disconnecting 
the +12 V power supply wire until all the other 
wires have been connected may prevent short 
circuits.

ˎ Be sure to use speakers with an adequate power 

rating. If you use small capacity speakers, they 
may be damaged.

ˎ Do not connect the ¾ terminal of the speaker 

system to the car chassis, and do not connect the 

¾ terminal of the right speaker with that of the 
left speaker.

ˎ Install the input and output cords away from the 

power supply wire. Running them close together 
may generate interference noise.

ʙ

ʙ

Set the INPUT SELECT switch to “2CH” or “4CH” 
according to the input connection.
Also, refer to the manual supplied with your car 
audio unit for further details.

Ƀ Line input connection

Set the INPUT SELECT switch to “4CH” with the 
speaker connection 

˫ (page 9).

Ʉ Line input connection

Set the INPUT SELECT switch to “2CH” with the 
speaker connection 

ˬ (page 9).

Input Connections

ʕ

Car audio

ʕ

Car audio

Connect the supplied power connection cable to 
the POWER/OUTPUT connector on the unit.

*1 Ground (earth) to chassis.
*2 If you have the factory original or some other car 

audio unit without a remote output for the amplifier, 
connect the remote input (REM) wire of the supplied 
power connection cable to the accessory power 
supply. With the high level input connection, the car 
audio unit can also be activated without need for a 
REMOTE connection. However, this function is not 
guaranteed for all car audio units.

ʔ

to a metal point of the car

less than 450 mm (17 

3

/

4

 in)

Fuse (15 A)

+12 V car battery

Car audio

Ʌ High level input connection

Set the INPUT SELECT switch to “4CH” with the 
speaker connection 

˫ (page 9).

ʖ

Gray

Gray/Striped

Front right speaker output

White

White/Striped

Front left speaker output

Car audio

Purple

Purple/Striped

Rear right speaker output

Rear left speaker output

Green

Green/Striped