An automotive wiring harness employs wires and cables. Each is made up of at least seven conductor strands (A), and
covered with an insulating material (B).
Within Volkswagen, wire and cable are classified in three general categories, and then specified according to size, type of insulation, and color.
Wires are stranded conductors ranging in size from 0.35 mm2 to 6.0 mm2 (approximately 22 to 9 gage (AWG)) that
make up most of a vehicle’s wiring harness. Smaller sizes save cost and weight. The larger sizes accommodate higher current loads with less resistance.
Wire larger than 6 mm2 (0 gage (AWG) is generally considered “cable.”
Wire size (cross-sectional area) is the primary factor that will determine the current-carrying capacity of a conductor. Standard sizes differ slightly, depending on which measuring standard is used.
Volkswagen uses wire and cable that is manufactured according to the German industrial or “DIN” standards. Wire size is defined by cross-sectional area, and is measured in circular mils (mm2). As in the example shown, “0.75 mm” refers to the area (0.75 mm2), not the diameter.
Sizes of wire and cable originating in North America are described according to the American Wire Gage (AWG) standard. The standard wire sizes in both systems are roughly equivalent.
The role of the Gateway (also known as the Data bus diagnostic interface J533) is the exchange of data between the CAN data bus systems (‘powertrain CAN data bus’, ‘convenience CAN data bus’ and ‘infotainment CAN data bus’) and the conversion of diagnostic data from CAN data bus systems to K-cable and vice versa so the data can be used by vehicle diagnosis, testing and information systems like the dealer VAS tools and Vagcom/VCDS.
For various reasons including power drain issues with third generation head units or the addition of new unsupported modules the CAN bus gateway must be upgraded to a newer revision. This guide covers the replacement of the CAN bus gateway in a 2005 MY06 Volkswagen Golf GTI. The upgrade replaces the 1K0 907 530 E (1K0907530E) with a 1K0 907 530 AA (1K0907530AA).
This process works the same for most Volkswagen models.
1K0 907 530 E (1K0907530E)
1K0 907 530 AA (1K0907530AA)
Record current installation list and long coding
Take screen shots or make a note of your installation list in controller 19 – Can Gateway using Vagcom/VCDS. This step is critical unless you want to figure out what you had installed prior to the upgrade. Don’t be tempted to copy down the long code unless you are installing the exact same revision of gateway as different revisions have extra features.
Whilst not essential it is worth taking a screen shot of the different screens in the long coding.
Removing and Installing the Gateway
Remove the key from the ignition or disconnect the car’s battery (the battery disconnect is optional but better safe than sorry)
The gateway can be in two locations on the Golf. One is above the accelerator pedal and the other is above the clutch pedal (if fitted). The clutch pedal location was used for the first year or so of production.
MY05 gateway location
Release the connector and pull the connector off the data bus diagnostic interface.
Press three securing pins together and push out of holes to release or the holder is hinged and release that.
Install in the reverse order of removal.
Reconnect the battery
MY06 onwards gateway location
Release the connector (1) and pull the connector off the data bus diagnostic interface (2).
Press securing pins (3) together (see arrows) and push out of holes to release.
Install in the reverse order of removal.
Reconnect the battery
Coding the new gateway
Using the screen shots and notes from earlier you can now recode the gateway. Below are screenshots showing the differences between the two gateways (old gateway on the left and new gateway on the right
The Central Electronics Control Module (CECM) is situated above the pedals on the drivers side and controls all the lights in the car, monitors them, controls what appears in the MFD under the lights menu, controls the leaving home and coming home lights function, controls the horn(s) and other features. There are different variants of this module called the Medium and the Highline, the latter is required for fog lights, bi-xenons and other features.
Partial listing of CECM’s and their details
3C0 937 049 (3C0937049) – 21 Byte – Medium
3C0 937 049 A (3C0937049A) – 21 Byte – Medium
3C0 937 049 B (3C0937049B) – 21 Byte – Medium
3C0 937 049 C (3C0937049C) – 21 Byte – Highend
3C0 937 049 D (3C0937049D) – 21 Byte – Medium
3C0 937 049 E (3C0937049E) – 21 Byte – Highend
3C0 937 049 F (3C0937049F) – 21 Byte – Medium
3C0 937 049 G (3C0937049G) – 21 Byte – Highend
3C0 937 049 H (3C0937049H) – 23 Byte – Medium
3C0 937 049 J (3C0937049J) – 23 Byte – Highend
3C0 937 049 K (3C0937049K) – 23 Byte – Medium
3C0 937 049 L (3C0937049L) – 23 Byte – Highend
3C0 937 049 P (3C0937049P) – 23 Byte – Medium
3C0 937 049 Q (3C0937049Q) – 23 Byte – Highend
3C0 937 049 R (3C0937049R) – 23 Byte – Medium
3C0 937 049 S (3C0937049S) – 23 Byte – Highend
3C0 937 049 T (3C0937049T) – 23 Byte – Medium
3C0 937 049 AA (3C0937049AA) – 23 Byte – Highend
3C0 937 049 AB (3C0937049AB) – 23 Byte – Medium
3C0 937 049 AC (3C0937049AC) – 23 Byte – Highend
3C0 937 049 AD (3C0937049AD) – 23 Byte – Medium
3C0 937 049 AE (3C0937049AE) – 23 Byte – Highend
3C0 937 049 AF (3C0937049AF) – 23 Byte – Medium
3C0 937 049 AG (3C0937049AG) – 23 Byte – Highend
3C0 937 049 AH (3C0937049AH) – 30 Byte – Medium
3C0 937 049 AJ (3C0937049AJ) – 30 Byte – Highend
3C0 937 049 AK (3C0937049AK) – 30 Byte – Medium
3C0 937 049 AL (3C0937049AL) – 30 Byte – Highend
3C8 937 049 A (3C8937049A) – 30 Byte – Medium
3C8 937 049 D (3C8937049D) – 30 Byte – Medium
3C8 937 049 E (3C8937049E) – 30 Byte – Highend
3C8 937 049 F (3C8937049F) – 30 Byte – Highend
3C8 937 049 G (3C8937049G) – 30 Byte – Medium
3C8 937 049 H (3C8937049H) – 30 Byte – unsure
3C8 937 049 N (3C8937049N) – 30 Byte – unsure
3C8 937 049 P (3C8937049P) – 30 Byte – unsure
3C8 937 049 Q (3C8937049Q) – 30 Byte – unsure
3C8 937 049 R (3C8937049R) – 30 Byte – Highend
3C8 937 049 S (3C8937049S) – 30 Byte – Highend
3C8 937 049 AA (3C8937049AA) – 30 Byte – unsure
3C8 937 049 AB (3C8937049AB) – 30 Byte – Highend
Whilst this guide is intended for the Volkswagen Skoda Bluetooth kit harness it applies to anything that requires interfacing to the quad lock connector on the rear of the head unit or that uses similar connectors around the car. This guide specifically for 2 x power connections and 2 x data connections.
The way this works is you remove the terminal from the housing, join that terminal to the matching terminal and insert the opposite terminal into the housing.
First you need to obtain the connector housings and repair wires.
1 x 000 979 133 (000979133) – 1mm repair wire – CAN bus Hi and Lo female.
1 x 000 979 134 (000979134) – 1mm repair wire – CAN bus Hi and Lo male.
1 x 000 979 225 (000979225) – 2.5mm repair wire – 12v and ground female.
1 x 000 979 226 (000979226) – 2.5mm repair wire – 12v and ground male.
4 x 191 972 701 (191972701) – Housing
4 x 191 972 711 (191972711) – Connector Housing
Alternatively you could replace the four housings and connector housings with a single housing and connector housing.
1 x 1J0 972 704 (1J0972704) – Housing
1 x 191 972 714 (191972714) – Connector Housing
Step 1 – Cut the four repair wires in half, remove the insulation from the ends of all four and twist the exposed wire together. Do the same for the power and CAN bus wire. Join one male and one female repair wire half together (ensure that you join the 2.5mm female to the 2.5mm male) as shown and connect the ground wire to one and redo the step for the power wire.
Step 2 – Solder each of the four repair wire halves and the two power wires from the harness as shown.
Step 3 – Double the harness wire back on top of itself.
Step 4 – Using heat shrink cover each soldered area as shown. Use a smaller length to cover the join and than place a longer length over the top to minimise the chances of any shorts.
Step 5 – Repeat the last part of Step 1 with the 1mm repair wire and the CAN bus cable.
Step 6 – Place a piece of coloured heatshrink on one male/female CAN bus set, ensure that these are connected to the same wire! This allows you to ensure that you have hooked this up correctly later on. Repeat for the power set of cables.
Early build Volkswagen cars can experience a power drain issue after upgrading their 2nd generation headunit from a RCD 300 or RCD 500 to a 3rd generation headunit like the RCD 210, RCD 310, RNS 310 and RCD 510.
in vehicles belonging to the model series PQ35/PQ46 from
model year 2008 as well as the Tiguan,
Vehicles belonging to the model series PQ35/PQ46 from model year 2008 (MY08) as well as the Tiguan have gateways that are updated. Earlier models may require the updated CAN bus gateway to be installed. See Volkswagen Model Year Information for more details on the week of manufacture however generally Volkswagen change over Model Years around Week 22.
This problem does not* affect retrofits of the RNS 510 which is a 3rd generation head unit as this unit was in the production in 2007 whereas the RCD 210, RCD 310, RNS 310 and RCD 510 are recent additions.
Check the ‘Skoda Parts’ link (right hand menu) for a reasonably priced gateway. Revisions that will work after the 1K0 907 530 S (1K0907530S) revision include 1K0 907 530 AA (1K0907530AA), 1K0 907 530 AB (1K0907530AB) and 1K0 907 530 AC (1K0907530AC).
* This problem does now affect the RNS 510 if the firmware is upgraded to 2660 or higher. The RNS 510 will exhibit the same problems as the RCD 210, RCD 310, RNS 310 and RCD 510 and requires the CAN bus gateway to be upgraded.