Mazda 6. Manual - part 70

T–56

AUDIO AND NAVIGATION SYSTEM 

Climate control unit (auto A/C only)

Terminal

Signal

1A

Blower motor feedback

1B

+5 V

1C

Blower motor control

1D

—

1E

Rear window defroster relay

1F

On-board diagnostic

1G

Wiper deicer relay

1H

—

1I

Sensor ground

1J

HNTI

1K

A/C ambient temperature sensor

1L

HNTI

1M

Cabin temperature sensor

1N

—

1O

Water temperature sensor

1P

A/C

1Q

Evaporator temperature sensor

1R

—

1S

Solar radiation sensor

1T

Hazard warning ground

1U

Potentiometer (air mix actuator)

1V

—

1W

Potentiometer (airflow mode actuator)

1X

Hazard warning switch

2A

Panel light control

2B

TNS

2C

Air mix actuator drive

(HOT

→

COLD)

2D

Air mix actuator drive

(COLD

→

HOT)

2E

Airflow mode actuator drive

(VENT

→

DEFROSTER)

2F

B+ (Power back up)

2G

Airflow mode actuator drive

(DEFROSTER

→

VENT)

2H

IG2

2I

Air intake actuator drive

(FRESH

→

RECIRCULATE)

2J

—

2K

Air intake actuator drive

(RECIRCULATE

→

FRESH)

2L

Ground 

AUDIO AND NAVIGATION SYSTEM 

T–57

T

T

Switch/Button/Indicator light Location

End Of Sie

A6E8124T002

No.

Switch/button/light

Related system

1

Hazard warning switch

Hazard warning 
system

2

FM1 button

Audio system

3

FM2 button

Audio system

4

AM button

Audio system

5

CD button

Audio system

6

TAPE/MD button

Audio system

7

SEEK button (upper) (type A)

Audio system

SCAN button (type B)

Audio system

8

SEEK button (lower) (type A)

Audio system

AUTO-M button (type B)

Audio system

9

TA button (type A)

Audio system

SEEK button (upper) (type B)

Audio system

10

AUTO-M button (type A)

Audio system

SEEK button (lower) (type B)

Audio system

11

AF button (type A)

Audio system

12

PYT button (type A)

Audio system

13

POWER button (type A)

Audio system

AUDIO CONT button (type B)

Audio system

14

AUDIO CONT button (type A)

Audio system

POWER button (type B)

Audio system

15

Preset button “1”

Audio system

16

Preset button “2”

Audio system

17

Preset button “3”

Audio system

18

Preset button “4”

Audio system

19

Preset button “5”

Audio system

20

Preset button “6”

Audio system

21

Rear window defroster switch 
(auto A/C)

Rear window 
defroster system

A/C switch (manual A/C)

Air conditioner 
system

22

REC/FRESH switch

Air conditioner 
system

23

A/C switch (auto A/C)

Air conditioner 
system

Rear window defroster switch 
(manual A/C)

Rear window 
defroster system

24

Climate control unit
(See 

U–13 CLIMATE 

CONTROL UNIT

)

Air conditioner 
system

25

Passenger-side air bag cut-off 
indicator light

Air bag system

No.

Switch/button/light

Related system

T–58

AUDIO AND NAVIGATION SYSTEM 

AUDIO UNIT

A6E812466900T02

Outline

•

The audio unit is composed of the base unit, upper module, and lower module.

•

Upper and lower module availability depends on vehicle grade.

•

The construction and operation of upper module and lower module are the same as that of current XEDOS 9, 
MILLENIA (TA) models.

Structural View

.

Terminal Layout and Signal

•

(See 

T–53 CENTER PANEL MODULE

.)

End Of Sie

BASE UNIT

A6E812466900T03

Outline

•

The base unit controls the AM/FM tuner, upper/lower modules, and externally extended unit (e.g. CD changer).

•

An auto level control (ALC) function that controls speaker volume according to vehicle speed has been 
adopted.

•

For drive information system (DIS) equipped vehicles, a CAN communication control circuit is included in the 
base unit. The base unit receives, using the CAN system, the DIS display signal from the instrument cluster, 
and converts it to a signal sent to the information display. (See 

T–40 DRIVE INFORMATION SYSTEM

)

Structural View

End Of Sie

A6E8124T001

1

Base unit

2

Upper module (CD player or CD changer)

3

Lower module (cassette deck or MD player)

4

Cover (without upper module)

A6E8124T003

1

Base unit

AUDIO AND NAVIGATION SYSTEM 

T–59

T

T

AUTO LEVEL CONTROL (ALC) FUNCTION

A6E812466900T04

Function

•

Adjusts the audio volume so that the sound is balanced against wind and road noise while driving.

Operation

•

The audio unit changes the volume automatically based on the vehicle speed signal sent from the instrument 
cluster.

.

•

The ALC function is divided into four modes, and can be used effectively to match the driving conditions.

End Of Sie

ON-BOARD DIAGNOSTIC SYSTEM (AUDIO SYSTEM)

A6E812466900T05

Outline

•

The on-board diagnostic system has a self-diagnostic function and diagnostic assist function to help 
technicians locate malfunctions.

Self-diagnostic Function
Malfunction detection function

•

The malfunction detection section detects malfunctions occurring in the system.

A6E8124T021

1

Higher vehicle speed

2

Lower vehicle speed

3

Audio unit (base unit)

4

Vehicle speed signal

5

ALC circuit

6

Power amplifier

7

Speaker

8

Higher volume

9

Normal  volume

Mode

Condition

ALC function cancel

Outside road noise low

Outside road noise rather high

Outside road noise high