Door modules and window switch

[Gutoneto]

Hi all,

I’m looking for the schematic and pinout for the door module and the window switch.

My current switch had been playing up a lot lately, so I went back to the parts bin and refitted an older switch that originally came with the car. I had previously upgraded all the switches to the chrome-finished ones. After replacing the switch, I noticed that a persistent error I’d had for years completely disappeared.

After some further investigation, I realised the faulty switch has 8 pins, whereas the original one has 10 pins.

TL;DR:
I had a strange issue where the fuel tank lid would never lock. I always assumed this was caused by upgrading my basic BCM to a MK7.5 High to support future retrofits. However, after replacing the window switch, the fuel lid started working as it should.

After some quick research online, I found that the door module can communicate via CAN or LIN for my surprise, but I couldn’t find much more detailed information. This could also explain some other odd behaviour I’ve had: when locking/unlocking or opening/closing the doors, I sometimes get the message when the key is not in the ignition:

“Error: Workshop! Leave vehicle only when selector lever is in position P.”

This error appears very randomly, flashes briefly in the MFD, and never leaves a fault log.

I’ve spent hours (and days) trying to track down the cause without success, and I always suspected something door related, possibly a faulty module or moisture in the wiring causing incorrect messages on the CAN network.

Any additional information would be greatly appreciated. I’m currently going through all the BCM and door module adaptation maps to see if I can find something that may have been overlooked.


Thanks!

[DV52]

Gutoneto: Hi.

Hmm........ not sure that I entirely understand your request - which "door module" and which "window switch" do you mean? I ask because the wiring differs depending on whether this problem is on the driver, or passenger car-side!

That said, the door modules generally have 4 x sockets and lots of terminating pins - see below:

And the general set-up for the driver-door module and the central window switch panel is as I show below (I'm guessing that you are referring to this switch because it has a 10 x pin connector)

Ignore the circled item -the picture was originally intended for a different purpose. If you are not familiar with VW;s nomenclature for wiring diagrams - it works as follows:
Notice the termination labelled T10g /8 on the extreme upper, right-side of E512 in my picture. This means:

• T10= a connector with a Total of 10 x pin positions
• g = a reference that identifies this connector from multiple other 10 x pin connectors on the car
• /8 = pin #8

ALL other terminations in my picture use the same nomenclature

Notes:

• Not shown on my picture (my omission) is that the 2 x brown wires on E512 for 10g /3 and 10g /10 are connected to earth
• The 32 x pin connector shown for J386 is S004 in my first picture

As for your "TL;DR: I had a strange issue where the fuel tank lid would never lock" problem - again I'm not sure that I entirely understand the issue. However, my hunch is that this problem MIGHT BE (caps for emphasis) related to the fact that the new mk7.5 BCM almost certainly does NOT have an active long-code string whereas the original BCM did have this facility.

Again I'm totally guessing based on very little information - but the long-code software switch that told the original BCM to enable the tank lid lock was Byte 10, Bit 4. Because the new mk7.5 BCM doesn't use an active long-code string- the equivalent facility is in the adaptation channel database.

So, if my hunch is correct - I suggest that you set the following BCM channel:

• ENG141654-ENG116622-ZV Autolock-Geschwindigkeitsabhaengige Tankdeckelverriegelung > active

Finally- yes, "the door module can [and does] communicate via CAN or LIN". But this shouldn't be surprising because the Golf mk7 that was sold in Australia did NOT have separate rear door modules. For our mk7s, the front door modules on both car-sides have full CAN registration and they talk to the equipment in the rear doors via LIN communication protocol!
Don