Help
This topic is locked
The 1.4TDI engine is capable of supporting of cruise control, even though it was never on the options list. In order to retro fit cruise, a custom made wiring loom and activation with VAG-COM is required. For that OEM finish, a T4 Transporter cruise control stalk is a perfect match.
Fitting the loom
Since there is no wiring loom in place already, a custom one has to be made. The wiring loom connects the switches for the cruise control functions to the ECU. This involves dismantling the ECU connections and a bit of soldering; only attempt if it you feel confident. Make sure to disconnect the battery before taking anything apart.
I made up a test loom using two push-to-make switches I had lying around, as I wanted to confirm the cruise worked before I ordered the stalk. The loom needs four wires:
I chose to feed the loom through a hole in the bulkhead, above the clutch pedal. On the engine-bay side there is a large hole with a blank grommet, to the right of the master cylinder. Here it is with the grommet removed:
There is actually another smaller hole to the left of this big hole, there was no blanking plug in it which I thought was odd, so I decided to feed the wire through there instead of cutting up the larger grommet.
(I have since fitted it with a rubber grommet)
I chose to feed the wire through the rubber plug into the plenum chamber under the scuttle panel. I removed some of the black tape to pierce the hole. I'll replace the tape to make it look neater after I've finished.
Next I threaded the new loom through the existing plastic trunking for that factory finish look (it took a while!). Another member (Gazza) used a separate piece trunking that matches the original, as can be seen here:
Now remove the left hand ECU plug by sliding out the slider behind where the wires enter the plug (hard to explain but you'll know after you've done it once). Snip the black cable tie, then prise off the cover from the end where the wires enter. It should now look like this:
Flip the plug over and remove the purple t-piece using a screwdriver, like in these pics:
Pull this out taking care not to snap it:
Gently pull on the top layer or wires to remove the plug. Insert a jewellers screwdriver as shown to straighten the retaining lug:
Slide out the connector:
Solder connections onto loom and insert them into the plug as follows:
MrBiscuit, on Jun 28 2006, 09:40 AM, said:
1. (white) ECU 46 cruise on/off
2. (Blue) ECU 45 Resume
3. (red) ECU 44 Set
4. (Black) ECU 14 Enable cruise (& connect to ignition 12V for stalk)
The colours of course are arbitrary, 1 to 4 is the connection to the proper stalk control if required.
2. (Blue) ECU 45 Resume
3. (red) ECU 44 Set
4. (Black) ECU 14 Enable cruise (& connect to ignition 12V for stalk)
The colours of course are arbitrary, 1 to 4 is the connection to the proper stalk control if required.
If you are using different colours like I did, make a note of which colour goes to which number.
The soldering isn't as bad as it looks, honestly!
Now it should look something like this:
Refit the cover on the plug and put everything back together. Make sure none of the wiring is anywhere near any hot or moving parts. Inside the car, I cable tied the loom to the wire that goes to the clutch pedal switch, to keep it away from the pedal mechanisms. The wire can be seen in the top left of this pic:
Switches in temporary position in the dashboard:
This post has been edited by jon_273: 12 July 2008 - 09:00 PM
