hey,
Today I installed an amp and subwoofer into my 207 with the factory RD4 head unit.
I got so close to finishing it but I didn't have a drill to get my power cable through the firewall- I will have to do it later in the week.
Started off working out where the amp and sub will go - I was toying with putting the amp under the seat for a while as there are pipes for such wires to run through already in place - it also would mean that the fragile amp would not be in the boot where you through your golf clubs/ bodies or such in.
So amp went in the boot - I ran power cable with remote wire down the passenger side and found a nice spot for the cable to go through the firewall just behind the glove box.
Changed the battery terminals over to my gold plated LED terminals with volt meter which required allot of cutting into the old cable and connectors.
ok so how do you connect a sub to a head unit without any output.
There are two ways- high level output or high level to low level RCA converters which you can purchase from JCar
I didn't finish the install today as mentioned but I ran both RCA and high level cable down the drivers side so I will be able to test which will sound better- i doubt it will matter seeing as I am only going to power a subwoofer off it but I will plug in some speakers just to see what the quality is like.
Also-the way i connected in the high level- RCA box was i just striped a bit of the rear speaker cable wires and soldiered them on as a T-Junction. the RCA box shouldn't put to much power so the back speakers will still work fine Ill let you guys and girls know how it goes. when i plug it in.
RD4 Wire diagram
Part A
Pin 1: Right Rear audio +
Pin 2: audio Right front +
Pin 3: audio Left front +
Pin 4: Left Rear audio +
Pin 5: Right Rear audio -
Pin 6: Right front audio -
Pin 7: audio front Left -
Pin 8: audio Rear Left -
___ (contacts 1 to 8 - is the amplifier output power, the dynamics)
Pin 9: Not used
Pin 10: data CAN High
Pin 11: +12 v switched remote - the signal output to activate external devices (amp)
Pin 12: battery +12 volt powered radio
Pin 13: CAN data low
Pin 14: external mute - input signal to mute the music, such as the handsfree
Pin 15: Not used
Pin 16: ground - "mass" of the unit,
Part B
Pin 1: audio right AUX 2
Pin 2: audio ground AUX 2
Pin 3: Not used
Pin 4: audio right AUX 1 - right channel AUX input
Pin 5: Not used
Pin 6: Not used
Pin 7: audio left AUX 2
Pin 8: Not used
Pin 9: Not used (microphone)
Pin 10: audio left AUX 1 - left channel AUX input
Pin 11: audio ground AUX 1 - "earth" AUX input
Pin 12: Not used
Part C
Pin 1: ground CDC (cd-Changer)
Pin 2: data CAN low CDC
Pin 3: + battery CDC
Pin 4: Right audio CDC
Pin 5: Not used
Pin 6: Not used
Pin 7: CAN data High
Pin 8: audio ground CDC
Pin 9: Not used
Pin 10: audio left CDC
Pin 11: Not used
Pin 12: not used
Fuse (minifuse) 15A
converter box
Been at it for most of the day- as well as fixing plumbing around the house so my hands are so hacked up. Sorry for mistakes
Today I installed an amp and subwoofer into my 207 with the factory RD4 head unit.
I got so close to finishing it but I didn't have a drill to get my power cable through the firewall- I will have to do it later in the week.
Started off working out where the amp and sub will go - I was toying with putting the amp under the seat for a while as there are pipes for such wires to run through already in place - it also would mean that the fragile amp would not be in the boot where you through your golf clubs/ bodies or such in.
So amp went in the boot - I ran power cable with remote wire down the passenger side and found a nice spot for the cable to go through the firewall just behind the glove box.
Changed the battery terminals over to my gold plated LED terminals with volt meter which required allot of cutting into the old cable and connectors.
ok so how do you connect a sub to a head unit without any output.
There are two ways- high level output or high level to low level RCA converters which you can purchase from JCar
I didn't finish the install today as mentioned but I ran both RCA and high level cable down the drivers side so I will be able to test which will sound better- i doubt it will matter seeing as I am only going to power a subwoofer off it but I will plug in some speakers just to see what the quality is like.
Also-the way i connected in the high level- RCA box was i just striped a bit of the rear speaker cable wires and soldiered them on as a T-Junction. the RCA box shouldn't put to much power so the back speakers will still work fine Ill let you guys and girls know how it goes. when i plug it in.
RD4 Wire diagram

Pin 1: Right Rear audio +
Pin 2: audio Right front +
Pin 3: audio Left front +
Pin 4: Left Rear audio +
Pin 5: Right Rear audio -
Pin 6: Right front audio -
Pin 7: audio front Left -
Pin 8: audio Rear Left -
___ (contacts 1 to 8 - is the amplifier output power, the dynamics)
Pin 9: Not used
Pin 10: data CAN High
Pin 11: +12 v switched remote - the signal output to activate external devices (amp)
Pin 12: battery +12 volt powered radio
Pin 13: CAN data low
Pin 14: external mute - input signal to mute the music, such as the handsfree
Pin 15: Not used
Pin 16: ground - "mass" of the unit,
Part B
Pin 1: audio right AUX 2
Pin 2: audio ground AUX 2
Pin 3: Not used
Pin 4: audio right AUX 1 - right channel AUX input
Pin 5: Not used
Pin 6: Not used
Pin 7: audio left AUX 2
Pin 8: Not used
Pin 9: Not used (microphone)
Pin 10: audio left AUX 1 - left channel AUX input
Pin 11: audio ground AUX 1 - "earth" AUX input
Pin 12: Not used
Part C
Pin 1: ground CDC (cd-Changer)
Pin 2: data CAN low CDC
Pin 3: + battery CDC
Pin 4: Right audio CDC
Pin 5: Not used
Pin 6: Not used
Pin 7: CAN data High
Pin 8: audio ground CDC
Pin 9: Not used
Pin 10: audio left CDC
Pin 11: Not used
Pin 12: not used
Fuse (minifuse) 15A
converter box

Been at it for most of the day- as well as fixing plumbing around the house so my hands are so hacked up. Sorry for mistakes