Miata Audio Pinouts

by Stephen Foskett - sfoskett@slf.gweep.net

Back to my Miata pages at Fosketts.Net

(Nov 10, 2004)

Contents:


Introduction to Mazda Audio Systems

This FAQ covers Miata audio systems from 1990 through the current models. Other Mazda systems will be added as information becomes available.

Mazda has a long relationship with Matsushita/Panasonic, so Miata audio systems from 1990 through 2000 are based on Panasonic designs. Descriptions of pinouts for these systems are found in the first part of this FAQ. In the early '00s, Ford and Mazda partnered with Sanyo to design a new modular audio system. More information on this system is in the second part of this FAQ.

Audio System Summary

Year Description Model Number Front Photo Rear Photo Connectors
2004+ Bose (4H64)   2004 4H64 Front, Photo by Stephen Foskett   J-01 J-02 CD/Tape Bose Amp
2004+ Non-Bose (4163)   2004 4163 Front Missing Knobs, Photo by Stephen Foskett   J-01 J-02 CD/Tape
2002-2003 Bose (4H60) ND22 66 950 2003 4H60 Front, Photo by Stephen Foskett 2003 4H60 Rear, Photo by Stephen Foskett J-01 J-02 CD/Tape Bose Amp
2001-2003 Non-Bose (4162)   2003 4162 Front, Photo by Ryan Malone   J-01 J-02 CD/Tape
2000-2001 Bose (1M37)   2000 1M37 Front, Photo by anonymous   CN701 CN702 CN200 Bose Amp
2000 Non-Bose (4M32)   2000 4M32 Front, Photo by anonymous 2000 4M32 Rear, Photo by anonymous CN701 CN702 CN200
1999 Non-Bose (1M32) NC20-66-9R0     CN701 CN702 CN200
1999 Bose (1M31) NC10-66-9R0 1999 1M31 Front, Photo by anonymous 1999 1M31 Rear, Photo by anonymous CN701 CN702 CN200 Bose Amp
1997 Type 2 (MPSS) NB41-66-9C0 1997 MPSS Front, Photo by anonymous   CN701 CN702 MSSS Amp MSSS CD
1996*-1997 Type 1 (1273) NB40 66 9C0 1997 Type 1 Front, Photo by anonymous 1997 Type 1 Rear, Photo by anonymous CN701 CN702 CN200
1996* Type 1 (1267) NA53-66-9C0 1992 Type 1 Front, Photo by anonymous 1992 Type 1 Rear, Photo by anonymous CN701 CN702 Round
1995 Type 2 (MSSS2) NB11-66-9C0 1995 MSSS2 Front, Photo by anonymous   CN701 CN702 MSSS Amp MSSS CD
1995 Type 1 (1267) NA01-66-AC0A 1995 Type 1 Front, Photo by anonymous 1995 Type 1 Rear, Photo by anonymous CN701 CN702 Round
1993-1994 Type 2 (MSSS1) NA52-66-AC0 1994 MSSS1 Front, Photo by anonymous   CN701 CN702 MSSS CD
1990-1994 Type 1 NA01 66 AC0 1992 Type 1 Front, Photo by anonymous 1992 Type 1 Rear, Photo by anonymous CN701 CN702 Round

Note for 1996.5 cars: Mazda changed head units partway through the 1996 model year. Specifically, cars made prior to December 1, 1995 had the older units and cars made after that date had the new model.

How can I add an Auxiliary Input (Aux-In) to my head unit?

Every Mazda head unit can be made to accept audio from an auxiliary input. This is useful for connecting MP3 platers, sattelite radio, etc... Here's how:

All head units
All head units can use an FM modulator. This is a special device that sits between the antenna and the head unit and "converts" one frequency into an aux input. The pro is that this is known to work everywhere. The con is that it doesn't sound as good and can be just as expensive as the other methods listed here. Note that a real hardwired FM modulator is NOT the same as the dinky little handheld FM transmitter that most stores sell for $19!
1990-1996* base (non-MSSS) head units
You can convert the round connector into an aux input by following these instructions.
1993-1997 MSSS/MPSS
The only way is to use an FM modulator.
1996*-2000 base and 1999-2001 Bose
You can convert the CN200 plug into an aux input by following these instructions.
2001-2004 base and 2002-2004 Bose
You can convert the J-02 plug into an aux input by buying a PIE MAZ/PC-ALP and connecting that to the J-02. Then, connect a PIE PIO/P-RCA and connect THAT to the PC-ALP. This gives you RCA inputs. You may have to ground the audio ground (outside part) of the RCA cables to the signal ground (pin G) of the J-02.

1990-2000 Systems

Almost all Mazda audio systems from 1990 through 2000 use the same main and auxiliary harness connectors. Some also have additional connectors for special purposes, like external amplifiers or CD changers.

CN701 (Main 12-Pin Harness)

This connector is normally used for the main (front door) speakers, as well as to connect the head unit to the vehicle's power and lighting system. It also has pins to activate an external amp and antenna and for vehicle speed sensing, though these may not be active on all vehicles.

The '93-'97 MSSS1, MSSS2, and MPSS use this connector for headrest speakers rather than the normal door speakers. Unlike just about every other NA headrest speaker, these are wired correctly from the factory.

This connector is found on the following head units:

Metra makes a pair of two-connector sets containing both the CN701 and CN702 (sold by or *):

Scosche also makes a connector set containing both the CN701 and CN702:

Bestkits also makes a connector set containing both the CN701 and CN702:

CN701
Main Harness
CN701, drawing by Stephen Foskett CN701, Photo by Bill Cason
Pin General Application Application/Color
'90-'94 Type 1 * '95-'96 Type 1 * '96.5-'97 Type 1 '93-'97 Type 2 (MSSS MPSS) '99-'00 Non-Bose '99-'01 Bose MX-3
A Power Supply ACC (Sw. 12v) Power Supply ACC (Sw. 12v) Power Supply ACC (Sw. 12v) Power Supply ACC (Sw. 12v) Power Supply ACC (Sw. 12v) Power Supply ACC (Sw. 12v) Power Supply ACC (Sw. 12v) Power Supply ACC (Sw. 12v)
Red Blue/ Black Blue/ Black Blue/ Black Blue/ Black Blue/ Black  
B Tele Mute N/C N/C N/C N/C N/C N/C N/C
             
C Power Supply +B (Con. 12v) Power Supply +B (Con. 12v) Power Supply +B (Con. 12v) Power Supply +B (Con. 12v) Power Supply +B (Con. 12v) Power Supply +B (Con. 12v) Power Supply +B (Con. 12v) Power Supply +B (Con. 12v)
Yellow Blue/ Red Blue/ Red Blue/ Red Blue/ Red Blue/ Red  
D Power Antenna (Sw. 13.2v) N/C Power Antenna (Sw. 13.2v) Power Antenna (Sw. 13.2v) Power Antenna (Sw. 13.2v) Power Antenna (Sw. 13.2v) Power Antenna (Sw. 13.2v) Power Antenna (Sw. 13.2v)
  Light Green/ Yellow Light Green/ Yellow Light Green/ Yellow Gray/ Black Gray/ Black  
E TNS+ (Dimmer) TNS+ (Dimmer) TNS+ (Dimmer) TNS+ (Dimmer) TNS+ (Dimmer) TNS+ (Dimmer) TNS+ (Dimmer) TNS+ (Dimmer)
Orange/ White Red/ Black Red/ Black Red/ Black Red/ Black Red/ Black  
F ILL- (Dimmer Return) N/C N/C ILL- (Dimmer Return) N/C ILL- (Dimmer Return) ILL- (Dimmer Return) ILL- (Dimmer Return)
  Red     Gray/ Red Gray/ Red  
H Speed Sensor N/C N/C N/C Speed Sensor N/C N/C N/C
      Green/ Red      
J Amp Control (Sw. 13.2v) N/C N/C N/C N/C N/C Amp Control (Sw. 13.2v) Amp Control (Sw. 13.2v)
          Light Green/ Black  
K Left Front+ Left Door+ Left Door+ Left Door+ Left Headrest+ Left Door+ Left Door+ (Differential to Amp) Left Front+
White Red/ Green Red/ Green Red/ Yellow Red Yellow/ Red  
L Left Front- Left Door- Left Door- Left Door- Left Headrest- Left Door- Left Door- (Differential to Amp) Left Front-
White/ Black Red/ White Red/ White Blue/ Orange White Yellow/ Black  
M Right Front+ Right Door+ Right Door+ Right Door+ Right Headrest+ Right Door+ Right Door+ (Differential to Amp) Right Front+
Gray Blue/ Yellow Blue/ Yellow Red/ Blue Yellow Yellow/ Green  
N Right Front- Right Door- Right Door- Right Door- Right Headrest- Right Door- Right Door- (Differential to Amp) Right Front-
Gray/ Black Blue Blue Blue/ White Orange Green  

Thanks to Cinega32.

CN702 (Auxiliary 8-Pin Harness)

This connector is normally used for headrest speakers (in NA Miatas without MSSS or MPSS), for door speakers (for NA Miatas with MPSS), for seat thumpers (for NA Miatas with MSSS1* or MSSS2), or left unused but active (in non-Bose NB Miatas). It is therefore popular for adding extra rear speakers. It is entirely inactive and useless in NB Bose head units.

Warning! Do not trust the colors listed in this table! From the factory, every application of this conector is crazy and mixed-up at pins A, B, F, and H! This is the cause of the famous out-of-phase speaker problems plaguing Miatas! Sadly, the wires are often wrong at both ends of the harness, so you can't just swap out the colors and expect it to work. What you need to do is pull apart the connectors on both ends, test continuity of each wire, and put the connectors back together correctly. I have listed the "correct" applications and colors in the table below, but these need to be corrected at both ends of the connectors! Jeff Anderson was kind enough to draw out some headrest speaker options for the Miata Forum.

Performance Buyers Club sells special harnesses to add headrest or rear speakers using this connector.

This connector is found on the following head units:

Metra makes a pair of two-connector sets containing both the CN701 and CN702 (sold by or *):

Scosche also makes a connector set containing both the CN701 and CN702:

Bestkits also makes a connector set containing both the CN701 and CN702:

CN702
Auxiliary Harness
CN702, drawing by Stephen Foskett CN702, photo by Bill Cason
Pin General Application Application/Color
'90-'96 Type 1 * '96.5-'97 Type 1 '93-'97 Type 2 (MSSS MPSS) '99-'00 Non-Bose '99-'01 Bose MX-3
A Left Rear+ Left Headrest+ Left Headrest+ Left Door+ Left Rear+ (unused) N/C Left Rear+
Green Red/ Yellow Red/ Green      
B Left Rear- Left Headrest- Left Headrest- Left Door- Left Rear- (unused) N/C Left Rear-
Green/ Black Blue/ Orange Red/ White      
C ACC N/C N/C N/C N/C N/C ACC
           
D Amp Control (Sw. 13.2v) N/C N/C N/C N/C N/C Amp Control (Sw. 13.2v)
           
F Right Rear+ Right Headrest+ Right Headrest+ Right Door+ Right Rear+ (unused) N/C Right Rear+
Violet Red/ Blue Blue/ Yellow      
H Right Rear- Right Headrest- Right Headrest- Right Door- Right Rear- (unused) N/C Right Rear-
Violet/ Black Blue/ White Blue      
I System Mute N/C N/C N/C N/C N/C System Mute
           
J N/C N/C N/C N/C N/C N/C N/C
           

Thanks to Cinega32.

Round Connector (13-Pin DIN)

This is another standard audio connector found on NA cars without MSSS or MPSS. There is a special shorting procedure necessary when using anything other than the stock Mazda CD player (this includes running it with no CD player). The Mazda CD player is part number NA01-66-AG0.

There's a nice writeup about using this with a Sony CD player, and this could also be adapted into an auxiliary input. However, this mod is simpler for just aux input.

This connector is found on the following head units:

Round Connector
Round Connector, drawing by Stephen Foskett Round Connector, photo by Bill Cason
Pin Application Application/Color
'90-'96 Type 1
1 Left Output Left Output
 
2 Left Input Left Input
 
3 Right Output Right Output
 
4 Right Input Right Input
 
5 Signal Ground Signal Ground
 
6 TNS+ TNS+
 
7 Power Supply ACC+ Power Supply ACC+
 
8 Power Supply B+ Power Supply B+
 
9 System On/Amp Control System On/Amp Control
 
10 Illumination- Illumination-
 
11 System Off System Off
 
12 System Control (Play) System Control (Play)
 
13 Mute Mute
 

Thanks to Jyri Virkki

CN200 (CD/Tape Connector)

This connector allows the single-DIN head units to control an external tape deck or CD player. It's also useful for adding an auxiliary input to these units (note that this linked page has right and left reversed). The same connector is found on the tape deck and allows daisy-chaining. It's compatible with Honda CD players with a new connector.

This connector is found on the following head units:

CN200
Casette Connector
CN200, drawing by Stephen Foskett CN200, photo by anonymous
Pin General Application Application/Color
'96.5-'97 Type 1 '99-'00 Non-Bose '99-'01 Bose
A Right Input Right Input Right Input Right Input
     
B Signal Ground Signal Ground Signal Ground Signal Ground
     
C Left Input Left Input Left Input Left Input
     
D Combi Control Combi Control Combi Control Combi Control
     
E Aux Control Out Aux Control Out Aux Control Out Aux Control Out
     
F Aux Control In Aux Control In Aux Control In Aux Control In
     
G Bus Ground Bus Ground Bus Ground Bus Ground
     
H Bus Line Bus Line Bus Line Bus Line
     
I Power Supply ACC Power Supply ACC Power Supply ACC Power Supply ACC
     
J Ground Ground Ground Ground
     
K Power Supply +B Power Supply +B Power Supply +B Power Supply +B
     
L Mute Mute Mute Mute
     
M TNS+ TNS+ TNS+ TNS+
     
N ILL- ILL- ILL- ILL-
     
O N/C N/C N/C N/C
     
P N/C N/C N/C N/C
     

Thanks to Neil Slavin

MSSS Amplifier Connector

This plug goes to the outboard amplifier (P/N GM-5246ZM) on the MSSS2 head unit. It has 8 pins.

This connector is found on the following head units:

MSSS Amp
G E C A
H F D B
Pin General Application Application/Color
'95-'95 Type 2 (MSSS2)
A Left+ Left+
Green
B Left- Left-
Blue
C Right+ Right+
Red
D Right- Right-
White
E N/C N/C
 
F Amp Cont. Amp Cont.
Yellow
G System Mute System Mute
Yellow/red
H Beep Sound Beep Sound
Yellow/black

MSSS CD Changer

This plug might go to a CD-Changer (P/N CDX-P5046ZM) but I'm not sure. It looks like it may be a Pioneer P-Bus plug for attaching Pioneer CD-Changers. It is not present on MPSS head units, but may be on MSSS1 or MSSS2 head units. It has 11 pins and one blank.

This connector is found on the following head units:

MSSS Amp
K F D A
L H   B
M J E C
Pin General Application Application/Color
'93-'95 Type 2 (MSSS1) '95-'96 Type 2 (MSSS2) '96-'97 Type 2 (MPSS)
A Left- Left- Left- Left-
     
B Left+ Left+ Left+ Left+
     
C N/C N/C N/C N/C
     
D Right- Right- Right- Right-
     
E Ground Ground Ground Ground
     
F Right+ Right+ Right+ Right+
     
H Ground Ground Ground Ground
     
J Ground Ground Ground Ground
     
K AsenB AsenB AsenB AsenB
     
L Bus- Bus- Bus- Bus-
     
M Bus+ Bus+ Bus+ Bus+
     

Bose Amplifier (99-01)

This connector is not on the head unit. Rather, it is the connector to the Bose amp package located below and behind the head unit. This picture shows where it is located.

Refer below for pinouts and more information.


2001+ Systems

All Mazda audio systems from the 2001 non-Bose and 2002 Bose use the same main and auxiliary harness connectors. There are two connectors on the back of the double-DIN unit, J-01 (main harness) and J-02 (auxiliary harness). Only the main harness (the larger one on the left, looking at the back of the unit) is used. Here is the connector pinout. This is the socket on the head unit.

See also the general Mazda pinout for advanced/extra functions.

The second pair of speakers (pins S, U, V, and X) do not function on the 4H60 (Bose) unit. This is probably a software, not hardware deficiency. In other words, there is probably some way to activate the fader function missing on the Bose head unit to enable these speakers, but it is currently unknown.

J-01 (Main Harness)

This connector is used for the main (front door) and rear (headrest) speakers, as well as to connect the head unit to the vehicle's power and lighting system. It also has pins to activate an external amp and antenna and for vehicle speed sensing, though these may not be active on all vehicles.

This connector is found on the following head units:

A) Metra makes a connector for J-01 (sold by or *):

Scosche also makes a connector for J-01:

Bestkits also has a connector for J-01:

Warning! Crutchfield lists the wrong connector for this car, and they will send you the wrong part if you rely on their advice! This unit requires the Scosche MA03 plugs, not the MA02 that they list!

J-01, drawing by Stephen Foskett J-01, photo by Stephen Foskett

Pin General Application Application/Color
2003 Miata 2003 Miata Bose 2004 Miata 2004 Miata Bose 2003 MPV 2003 Protege 2004 RX-8 Mazda6 Non-Bose Mazda6 Bose
A Left Front + Left Front + Left Front + Left Front + Left Front + Left Front + Left Front + Left Front + Left Front + Left Front +
Yellow/ Red Red   Black Blue/ Orange Black/ Red Red/ Blue Red ?
B Battery (+12V) Battery (+12V) Battery (+12V) Battery (+12V) Battery (+12V) Battery (+12V) Battery (+12V) Battery (+12V) Battery (+12V) Battery (+12V)
Blue/ Red Blue/ Red   Blue/ Red Blue/ Red Blue/ Red Blue/ Red Blue/ Red Blue/ Red
C Left Front - Left Front - Left Front - Left Front - Left Front - Left Front - Left Front - Left Front - Left Front - Left Front -
Yellow/ Black White   Green Violet Black/ White Light Green/ Red White ?
D Right Front + Right Front + Right Front + Right Front + Right Front + Right Front + Right Front + Right Front + Right Front + Right Front +
Yellow/ Green Yellow   Red White/ Red Red Blue/ White Blue ?
E Pulsed Dimmer (TNS+) Pulsed Dimmer (TNS+) Pulsed Dimmer (TNS+) Pulsed Dimmer (TNS+) Pulsed Dimmer (TNS+) Pulsed Dimmer (TNS+) Pulsed Dimmer (TNS+) Pulsed Dimmer (TNS+) Pulsed Dimmer (TNS+) Pulsed Dimmer (TNS+)
Red/ Black Red/ Black   Red/ Black Light Green/ Blue Light Green/ Blue Red/ Yellow ? ?
F Right Front - Right Front - Right Front - Right Front - Right Front - Right Front - Right Front - Right Front - Right Front - Right Front -
Green Orange   White White White Yellow/ Green Yellow ?
G Inverted Dimming Inverted Dimming Inverted Dimming Inverted Dimming Inverted Dimming Inverted Dimming Inverted Dimming Inverted Dimming Inverted Dimming Inverted Dimming
Grey/ Red Grey/ Red   Grey/ Red White/ Blue White/ Blue Grey/ Red Black/ Red? ?
H PWR Ant PWR Ant PWR Ant PWR Ant PWR Ant N/C N/C PWR Ant N/C N/C
Grey/ Black Grey/ Black   Grey/ Black     Yellow/ White    
I Speed Pulse N/C Speed Pulse N/C Speed Pulse N/C N/C Speed Pulse Speed Pulse Speed Pulse
  Green/ Red   Green/ Red     Green/ Red Green/ Red ?
J Amp Remote N/C Amp Remote N/C Amp Remote Amp Remote Amp Remote Amp Remote N/C Amp Remote
  Light Green/ Black   Light Green/ Black White Yellow (woofer?) Purple/ Blue   ?
K Nav: Parking Brake N/C N/C N/C N/C N/C N/C Nav: Parking Brake N/C N/C
            Yellow/ Green    
L Telephone Mute N/C N/C N/C N/C N/C N/C N/C N/C N/C
                 
M Nav: Reverse N/C N/C N/C N/C N/C N/C Nav: Reverse N/C N/C
            Blue/ White    
N Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls
        Grey/ Black   Red/ Black Red/ Blue? ?
O blank blank blank blank blank blank blank blank blank blank
                 
P Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls Clockspring/ Wheel Controls
        White/ Green   Green/ White Blue/ White ?
Q blank blank blank blank blank blank blank blank blank blank
                 
R IGN (+12V switched) IGN (+12V switched) IGN (+12V switched) IGN (+12V switched) IGN (+12V switched) IGN (+12V switched) IGN (+12V switched) IGN (+12V switched) IGN (+12V switched) IGN (+12V switched)
Blue/ Black Blue/ Black   Blue/ Black Purple/ Blue Purple/ Black Green/ Orange Orange? ?
S Left Rear + Left Rear + N/C Left Windblocker + Left Windblocker + Left Rear + Left Rear + Left Rear + Left Rear + Left Rear +
      Blue/ Yellow Green/ Orange Brown/ White Green/ Orange Purple ?
T blank blank blank blank blank blank blank blank blank blank
            Black/ White ? ?
U Left Rear - Left Rear - N/C Left Windblocker - Left Windblocker - Left Rear - Left Rear - Left Rear - Left Rear - Left Rear -
      Yellow Green Brown Blue/ Orange Pink ?
V Right Rear + Right Rear + N/C Right Windblocker + Right Windblocker + Right Rear + Right Rear + Right Rear + Right Rear + Right Rear +
      Green/ Yellow Yellow/ Black Green Grey/ Red White/ Blue ?
W Ground Ground Ground Ground Ground Ground Ground Ground Ground Ground
Black Black   Black Black Black Black Black Black/Orange
X Right Rear - Right Rear - N/C Right Windblocker - Right Windblocker - Right Rear - Right Rear - Right Rear - Right Rear - Right Rear -
      Green/ Black Purple Green/ Orange Brown/ Red Black/ Blue ?

Thanks Tobias Albert, Jeff Anderson, and Unknownhost!

J-02 (Auxiliary Harness)

This connector not currently used in any 2001+ Miata. Not much is known about the J-02. It is used in the Japan-market RX-8 for the built-in TV, and is thought to be used for an external CD changer (though none is known). It's also possible that this connector is used for the upcoming Sirius Satellite radio option for '04 Mazdas. The RX-8 boys couldn't get anything to work with it. Here's what I know about it.

On my head unit (a 4H60), the pins that are connected to motherboard traces are noted below. There is no guarantee that they do anything, but they are connected to something.

This connector is found on the following head units:

There is no known connector that fits this.

J-02, drawing by Stephen Foskett J-02, photo by Stephen Foskett

Pin Application 2004 Japan RX-8 4H60 Connected?
A Power Ground Purple/Blue Y
B System Mute Green/White N
C Right Input+ Blue/Yellow N
D Right Input- Red/Yellow N
E Left Input+ Red/Black N
F Left Input- Violet/White N
G Signal Ground   Y
H N/C   N
I N/C   Y
J N/C   Y
K Bus-   Y
L Bus+   Y
M N/C   N
N N/C   N
O Power ACC Brown/Red Y
P Power B+ Brown/White Y

Bose Amplifier (02+)

This connector is not on the head unit. Rather, it is the connector to the Bose amp package located below and behind the head unit. This picture shows where it is located.

This connector is found on the following head units:

There is no known connector that fits this.

To bypass the Bose amplifier, simply unplug this connector and jumper the corresponding input and output pins: C to L, D to K, F to N, and H to M. The remaining pins can be ignored. Note that the connector pictured is the harness, not the connector on the amplifier pack, so it is a mirror image of the "real" connector.

Bose Amp Connector, drawing by Stephen Foskett Bose Amp Connector, photo by Stephen Foskett

Pin General Application Application/Color
'99-'01 Miata Bose '02-'03 Miata Bose '04+ Miata Bose
A Switched Power (to Audio Relay) Switched Power (to Audio Relay) Switched Power (to Audio Relay) Switched Power (to Audio Relay)
Blue/ Orange Blue/ Orange?  
B N/C N/C N/C N/C
     
C Left Speaker- Left Speaker- Left Speaker- Left Speaker-
Yellow/ Red    
D Left Speaker+ Left Speaker+ Left Speaker+ Left Speaker+
Yellow/ Black    
F Right Speaker- Right Speaker- Right Speaker- Right Speaker-
Yellow/ Green    
H Right Speaker+ Right Speaker+ Right Speaker+ Right Speaker+
Green    
I Left Shield/ Ground Left Shield/ Ground Left Shield/ Ground Left Shield/ Ground
Black/ Orange Black/ Orange?  
J Right Shield/ Ground/ Input Shield Right Shield/ Ground/ Input Shield Right Shield/ Ground/ Input Shield Right Shield/ Ground/ Input Shield
Black/ Orange Black/ Orange?  
K Left Input+ Left Input+ Left Input+ Left Input+
Red Red  
L Left Input- Left Input- Left Input- Left Input-
White White  
M Right Input+ Right Input+ Right Input+ Right Input+
Yellow Yellow  
N Right Input- Right Input- Right Input- Right Input-
Orange Orange  

CD/Tape Connector

Here's the pinout for the internal 15-"pin" bus connector for the tape deck. The CD connector has the same pinout but is female instead of male. I also put in the labels screened onto the PCB, which are quite different in some cases...

This connector is found on the following head units:

There is no known connector that fits this.

Tape Connector, drawing by Stephen Foskett Tape Connector, photo by Stephen Foskett

Pin Application Label
A BUS+ Bus+
B BUS GND DGND
C +B +B
D +B? GND?
E P GND ?
F P GND ?
G EJECT TNS?
H NC -ILL?
I TEXT C1 NC?
J TEXT D0 NC?
K ACC ACC
L SYS MUTE S MUTE
M R R
N S GND S GND
O L L

Steering Wheel Controls

The steering wheel controls are momentary switches connected to pins P and N of the harness. They short these pins with various levels of resistance which is decoded into the various functions. I took apart my MPV's head unit and read the resistance on the functions it has. I then tried this control with my Miata's 4H60 head and the controls all worked perfectly. So this might presumably work with all FMS double-DIN heads!

Application Resistance
Mode 1k Ohms
Vol+ 150 Ohms
Vol- 60 Ohms
Track 300 Ohms
Mute 2k Ohms

Q) You don't know what you're talking about with this radio stuff.
How can I set you straight?

A) PLEASE contribute! If you have any more info, send it along! My email address is sfoskett@slf.gweep.net. This FAQ also has a home at miata.fosketts.net.

Also, please note that all of this information applies to the US Miatas, but some may not be correct for the Miatas in other countries. I'm not even sure if this radio was available in places other than the US! If you have anything about non-US radios to contribute, please do so!

And if you have a '99 or '00 workshop manual, please contact me!

Q) What's with the product placements/buying links?

My Miata pages were starting to generate significant traffic and load on the server I was hosting them on, so I moved them to a paid server at Dreamhost.Com, a hosting provider I have used for years. I was already including links to items at various vendors' sites, so I felt it would be acceptable to join their affiliates programs to help defray the cost of providing this content.

I am an affiliate of the following organizations, and will recieve some money for all purchases made when you click through from this site.