Honda / Acura Music Link (Technical)

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Contents

About

This page contains general information about the cables and PCB used in the Honda / Acura Music Link. This information was discovered during my experimentation with the Honda Music Link.

No guarantees are made about the accuracy of this information, although I believe it to be correct.


Serial Communications

  • 9600, 8N1
  • Communication via Apple Accessory Protocol in Mode 0x04 / AiR.
  • An example conversation between the Honda Music Link and a 5G 30GB iPod (Video) can be seen here. Decoding of many of the packets has been done by hand.


Pinouts

These pinouts were established via direct testing with the named cables, a disassembled Honda Music Link interface box, and a document detailing pinouts of connectors in 2006 Honda Civic vehicles.

Confirmation of iPod pinouts were made against the iPod Dock Connector documentation mirrored from the iPodLinux website.


Cable from Head Unit (HU) to Interface Box (IB)

Connectors

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Female 14-Pin Connector on Head Unit End (Honda Connector E, Female)
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Mini-DIN 8 Pin Male on Interface Box End (Mini-DIN, 8 Pin, Male)


Notes

  • SAT R(+), SAT L(+), SAT R(-), and SAT L(-) are the connections which pass audio.
  • SAT ECU BUS (+) and SAT ECU BUS (-) appear to handle data for signaling to the iPod / Interface Box.


Table

HU Pin HU Description IB Pin
1 +B GA-NET N/C
2 SAT SYS ACC 6
3 GND Shield
4   Shield
5 SAT R (+) 5
6 SAT L (+) 3
7   1
8   N/C
9 SAT ECU BUS (+) 8
10 SAT ECU BUS (–) 7
11 GA-NET GND Shield
12   N/C
13 SAT R (–) 4
14 SAT L (–) 2


Cable from Interface Box (IB) to iPod Dock Connector (iPod)

Connector

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Mini-DIN 8 Pin Male on Interface Box End (Mini-DIN, 8 Pin, Male)


Notes

  • iPod Pin Numbering is 1 through 30, with Pin 1 being on the left when the iPod dock connector is held connector up with the dock connector logo facing the viewer. The keyed face of the connector and the wires inside of the connector will be towards the viewer when held in this position.
  • Pin 21 on the iPod dock connector is tied to pins 29+30 in the connector with a 500K resistor. This is consistent with the iPod Linux Dock Connector information. This resistor appears to be located in the connector shell.
  • Pin 18 on the iPod dock connector, which sends 3.3v from the iPod, is used by the Honda Music Link to detect the presence of an iPod. Connecting this line takes the head unit out of EJECT mode and the Honda Music Link then begins first data transmissions, alternately sending the command to switch the iPod into Mode 4 (FF 55 03 00 01 04 F8) and querying the iPod for its type and size (FF 55 03 04 00 12 E7).


Table

IB Pin iPod Description iPod Pin
1 FireWire +12 VDC 19+20
2 FireWire Ground 29+30
3 Line Out (L) 4
4 Line Out (GND) 2
5 Line Out (R) 3
6 +3.3 VDC Power 18
7 Serial RX 13
8 Serial TX 12


DIN Connectors on Interface Board PCB

Connector

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Mini-DIN 8 Pin Female Connector on Interface Board PCB (Mini-DIN, 8 Pin, Female)


Tables

As viewed from the bottom (non-component-bearing) side of the PCB, with the connector-bearing edge of the PCB upwards:

5 2 1 3
8 7 4 6


J1 (To Head Unit) Viewed from Below
SAT R (+) SAT L (-) No Desc. (Pin 7 on Con. E) SAT L (+)
SAT ECU BUS (+) SAT ECU BUS (-) SAT R (-) SAT SYS ACC


J2 (To iPod) Viewed from Below
Line Out (R) FireWire Ground FireWire +12 VDC Line Out (L)
Serial TX Serial RX Line Out (GND) +3.3 VDC


JP1 Header to PIC16F876

Notes


Tables

As viewed from the top (component-bearing) side of the PCB, with the Mini-DIN connector-bearing edge of the PCB to the left:

1 2
3 4
5 6


JP1 to PIC16F876A Viewed from Above

MCLR/VPP +5VDC (VDD)
Ground RB7/PGD (28)
RB6/PGC (27) Ground


PCB Information

Photos


Component List

Click component name for data sheet or other relevant information.

Component Description
C2 100μF, 25v
C3 100μF, 25v
C5 100μF, 25v
C13 10μF, 50v
C71 100μF, 25v
C72 10μF, 50v
C73 10μF, 50v
C74 10μF, 50v
C75 47μF, 25v
C86 10μF, 50v
C87 10μF, 50v
J1 Socket, Mini-DIN, 8-Pin
J2 Socket, Mini-DIN, 8-Pin
JP1 Header, .100" Spacing, .250" Long Pins
Q1 UTC D882
R18 47KΩ
U1 National Semiconductor LP2950 (5V)
U2 NEC μPD72042B
U3 Microchip PIC16F876A
U4 ST TS831
U5 (Missing from board?)
U6 National Semiconductor LP2950 (3.3V)
U7 (Missing from board?)
U8 UTC MC4558 (SOP-8)
U9 Philips HEF2066B
Y1 3.686 MHz Crystal
Y3 6.290 MHz Crystal
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