OEM wiring loom colours & pins for stereo head-units

This is written for MK1 Fabia, but as Roomster is based on the Fabia, this could apply!

Following info. from Skoda, VW, Haynes, Pioneer, and personal experience! Use this as a guide only!! :yes:

There are two main DIN/ISO plugs on the OEM wiring loom for the stereo head unit, one has all the wiring for the speakers (Brown coloured and has the release clip in the centre of the side), the other all the power and control wiring (Black coloured and has the release clip offset on the side). Both of these conectors might be joined together, and just slid apart to seperate! There is also a third block (If you are luck enough to have it) which is for connecting the head unit to the OEM CD multi-player under the passenger seat.

THESE ARE THE COLOURS & PINS OF THE OEM SKODA WIRING LOOM TO CONNECT TO THE STEREO HEAD-UNIT

BLACK CONNECTOR (this has the release clip offset on the side)

8d/pin1 = White cable with Purple stripe = vehicle speed sensor (to increase volume with speed) OEM single DIN head-unit may not have a pin for this. (Pin function is correct with ISO)

8d/pin2 = vacant (This according to ISO is for the mute function of a connected telephone)

8d/pin3 = Grey cable with White stripe = VAG diagnostics through EOBD socket (DO NOT USE WITH NON OEM as 12v and can muck up your new head unit, especially if a diagnostic tool is connected!!! So disconnect from plug or cut and seal live end of wire) (This according to ISO is for the reversing light signal)

8d/pin4 = Brown cable with Red stripe = 12v switched supply with ignition (This according to ISO is for a 12v constant supply)

8d/pin5 = Black cable with Blue stripe = 12v constant supply to battery via Fuse No. 45 (20A) OEM single DIN head-unit does not have a pin for this, as this is to provide additional power for double DIN satnav unit. (This has on other VAG cars been a Brown cable with Red stripe = 12v switched supply with ignition) (This according to ISO is for the electric retractable aerial)

8d/pin6 = Grey cable with Blue stripe = dashboard illumination (Pin function is correct with ISO)

8d/pin7 = Black cable with Blue stripe = 12v constant supply to battery via Fuse No. 45 (20A). (This has on other VAG cars been a Red cable = 12v constant supply to battery via fuse No. ??) (This according to ISO is for a 12v switched supply with ignition)

8d/pin8 = Brown = Earth to E3 earthing point (Under the centre console in front of the gearstick) (Pin function is correct with ISO)

BROWN CONNECTOR (this has the release clip in the centre of the side)

All of these pin functions are correct with ISO.

8n/pin1 = Red cable with Green stripe = Rear deck drivers side bass speaker pin1 (+) (Red cable with Green stripe from this to tweeter in rear door)

8n/pin2 = Brown cable with green stripe = Rear deck drivers side bass speaker pin2 (-) (Brown cable with White stripe from this to tweeter in rear door)

8n/pin3 = Red cable no stripe = Front drivers door bass speaker pin3 (+) (Red cable no stripe from this to tweeter in rear door)

8n/pin4 = Brown cable with Red stripe = Front drivers door bass speaker pin1 (-) (Brown cable with Red stripe from this to tweeter in rear door)

8n/pin5 = Blue cable no stripe = Front passenger door bass speaker pin3 (+) (Blue cable no stripe from this to tweeter in door)

8n/pin6 = Brown cable with Blue stripe = Front passenger door bass speaker pin1 (-) (Brown cable with Blue stripe from this to tweeter in door)

8n/pin7 = Blue cable with White stripe = Rear deck passenger side bass speaker pin1 (+) (Blue cable with White stripe from this to tweeter in door)

8n/pin8 = Brown cable with White stripe = Rear deck passenger side bass speaker pin2 (-) (Brown cable with White stripe from this to tweeter in door)

OEM CD CHANGER UNDER PASSENGER SEAT WIRING

Pin3 on the CD Changer = Brown cable = Earth to E3 earthing point (Under the centre console in front of the gearstick).

Connector C3 on the back of the stereo headunit (smaller then the other two above)

20a/pin13 = Blue cable to pin 1 on CD Changer (CDC data in, according to ISO)

20a/pin14 = Green cable to pin 4 on CD Changer (CDC data out, according to ISO)

20a/pin15 = Yellow cable to pin 2 on CD Changer (+12v permanent, according to ISO)

20a/pin16 = Red cable to pin 6 on CD Changer (+12v switched - maximum 300mA, according to ISO)

20a/pin17 = Grey cable to pin 8 on CD Changer (CDC data ground, according to ISO)

20a/pin18 = Brown cable to pin 9 on CD Changer (audio frequency ground, according to ISO)

20a/pin19 = Purple cable to pin 10 on CD Changer (CDC audio frequency left channel, according to ISO)

20a/pin20 = White cable to pin 7 on CD Changer (CDC audio frequency right channel, according to ISO)

Cables from pins 18, 19, 20 should be all wrapped together in a metal foil screen. Or they are 3 cores of a screened cable.

You might also need an adaptor to connect your new headunit to the OEM ariel plug. The OEM plug is a right angled male, with the OEM head unit a "projecting" female. Most after-market head units have a "recessed" female socket, so an extender plug/adaptor (ISO/DIN) may be required, which can be easily found in Halfords, etc.

If any of the wires need "moving" then use the new wiring adaptor harness supplied with most good new headunits. If none supplied then Halfords etc. do adaptor harness (ISO to VAG) and then move the wires around on this (usually the switched and permanent 12v!)

FOR ROOMSTER

Also to fit an aftermarket single DIN head unit you will need a surround trim including a lower cubby hole as OEM headunit is a double DIN unit. This costs about £35ish from your local Skoda dealer code no. AZO 700 001

BASIC SPEC ROOMSTER

Some of these might not have a double DIN slot as the centre part of the dash is slightly different and you end up having a 1+ DIN size slot, so a larger facia cover piece is required. Not seen a Skoda one yet but try this; http://www.superskoda.com/skoda/fabia-ii/skoda-fabia-ii-1din-installation-frame-martinek-auto

NEW SKODA WIRING LOOM KIT FOR NON-OEM FIT STEREOS

Part Number: AZA700001A. Suitable For: Roomster

This kit provides the required cables and wire harnesses to sync it to the cars systems.

The kit contains: Interconnecting cable harness x1, Anti-noise screen x1, Fuse 7,5A x1, Fastening tape x5, Auxiliary terminal board (socket type)x1. RRP: £29.00

http://www.accessories.skoda.co.uk/productdetail.aspx?p_no=AZA700001A

EDIT

Pins 3,4 & 7,8 were allocated to the wrong speakers, double checked with Skoda, Kenwood, Pioneer etc. all OK now!!! CD info added.

Edited 9 November, 201114 yr by fabdavrav