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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5
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TUNER AND AMP UNIT [WITH CENTER DISPLAY]

Purpose

  • Controls the audio signal from the entertainment system-related parts.

Function

Tuner switching function

  • The tuner and amplifier unit (TAU) switches the tuner mode built-into the TAU based on the control signal sent from the connectivity master unit (CMU).

Audio signal output function

  • The TAU outputs the audio signal sent from the following units to the speakers.

    • CMU

    • CD player

    • Auxiliary jack/USB port/SD card slot hub (only auxiliary jack)

RS485*1 signal conversion function

NOTE:

  • The RS485*1 signal wiring harness is used in the following cases:

      • HD radio™

    • Radio broadcast logo, album art, or song name is sent to CMU from TAU

      RBDS-TMC

    • Traffic information such as location and length of traffic jams is sent to CMU from TAU

  • The TAU creates data from the radio waves received from the center roof antenna and converts the created data to a RS485 signal and sends it to the CMU.

*1
RS485 corresponds to a linear, multi-drop configuration with bi-directional transmission, which is one of the possible types of serial communication, having a maximum transmission speed of 10 Mbps.
ALC (auto level control) function

  • When the TAU receives the vehicle speed signal sent from the instrument cluster, it automatically changes the volume and audio quality according to the vehicle speed and compensates for the passengers' sense of a lack of audio volume which occurs as a result of external noise while driving.

Specification

Item

Specification

Rated voltage

(V)

12

Frequency range

AM

(kHz)

530—1710

FM

(MHz)

87.75—107.9

Amplifier maximum output

(W)

With Bose®:281

Without Bose®:25×4

Output impedance

(ohm)

4

Construction

  • The TAU unit is located in the upper part of the front side trim (RH).

Input/output signal table

Terminal

Signal

1A

—

1B

—

1C

—

1D

—

1E

—

1F

—

1G

—

1H

—

1I

AUX audio input LH (+)

1J

AUX audio input LH/RH (-)

1K

AUX audio input RH (+)

1L

AUX connection detection

1M

CD audio input LH (+)

1N

CD audio input LH (-)

1O

CD audio input RH (+)

1P

CD audio input RH (-)

1Q

CMU audio input LH (+)

1R

CMU audio input LH (-)

1S

CMU audio input RH (+)

1T

CMU audio input RH (-)

1U

—

1V

—

1W

RS485 signal (+)

1X

RS485 signal (-)

2A

Without Bose® : Door speaker/tweeter output LH (+)

With Bose® : Front speaker output LH (+)

2B

B+

2C

Without Bose® : Door speaker/tweeter output LH (-)

With Bose® : Front speaker output LH (-)

2D

Without Bose® : Door speaker/tweeter output RH (+)

With Bose® : Front speaker output RH (+)

2E

—

2F

Without Bose® : Door speaker/tweeter output RH (-)

With Bose® : Front speaker output RH (-)

2G

—

2H

Without Bose® : —*2

With Bose® : —

2I

Without Bose® : Vehicle speed input signal

With Bose® : —

2J

Without Bose® : —

With Bose® : Audio amplifir control

2K

—

2L

—

2M

—

2N

—

2O

Local HS-CAN_H

2P

—

2Q

Local HS-CAN_L

2R

ACC

2S

Without Bose® : Driver-side headrest speaker output LH (+)

With Bose® : Rear speaker output LH (+)

2T

Without Bose® : —

With Bose® : AudioPilot®

2U

Without Bose® : Driver-side headrest speaker output LH (-)

With Bose® : Rear speaker output LH (-)

2V

Without Bose® : Driver-side headrest speaker output RH (+)

With Bose® : Rear speaker output RH (+)

2W

Ground

2X

Without Bose® : Driver-side headrest speaker output RH (-)

With Bose® : Rear speaker output RH (-)

3A

Antenna amplifier power supply

3B

Radio input

3B'

Ground

4A

SiriusXM satellite radio input*3

4A'

Ground*3
*2
Not used
*3
SiriusXM satellite radio

Operation

Fail-safe

  • Not applicable

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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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