AWD module location?

[ARModen]

I had a bunch of fault codes pop up related to the AWD/ABS/TC system. It's not the usual wheel speed sensor (replaced all of them already). From reading the internet it seems to be a fairly common issue with the AWD control module (95B927771). The dealer has none and they don't have an ETA from germany for a new one. So, instead of leaving it at the dealership for the next 6 weeks, I got one off ebay.

 

My only problem is locating it in the car. The parts diagram clearly indicates that it is located in the car (thanks porsche).  The service manual states "replace module". Is it up under the dash on the passenger side, drivers side, etc? If anyone has replaced one of these I'd love it if you'd save me a few hours of hunting and disassembling the interior.  So far I'm finding absolutely nothing online about something that seems to have been replaced multiple times on some cars.

It's a 2015 LHD, S. Thanks.

 

So far I've checked both rear wheel wells, and pulled up all the carpet/trim on the front passenger side.  No luck

Edited June 25, 2023 by ARModen

[Loren]

Transfer gear control unit or the control unit for rear differential lock?

 

I find the later -control unit for rear differential lock but not the former -- unless they are the same box.

[Loren]

Or control unit for the transfer box ?  That is on the transfer box.

[ARModen]

This module is too pretty to be strapped under the car.  Porsche calls it the "Control unit for dif. Controller. Differential Control Module" so I think it's the module that controls the transfer case control servo/motor.  It controls the torque split.  The car rolls just fine up and down the driveway because all the codes cleared when I was checking the wheel speed sensors.  I rolled out into the street, turned the wheel and as soon as I moved forward the torque split went 100% forward and then I get a front diff overload, and it reverts to RWD only mode.  I haven't had any mechanical binding and it first happened as I was cruising straight down the road @40 mph.  Makes me think it's electrical problem.  On the cayenne it is supposedly stacked with the PDK controller under the passenger seat.  So I'm going to tilt that back and take a look.  There has been water under the seat from the hurricane last year overwhelming my roof drains.   

Edited June 26, 2023 by ARModen

[ARModen]

According to the internet the car has this module.  According to my eyes and porsche it does not.  great.  All the codes are gone and it's driving fine now, so I guess I'll just wait till it gets bad enough to drop it at the dealership.  Going to stick with the 996 and earlier from now one.  No more audi stuff.

Edited June 26, 2023 by ARModen

[Loren]

[ARModen]

The code came back after about 20 minutes of driving, so I guess I'm going to be doing a pretty full service of the transfercase/transmission this weekend

[ARModen]

So I changed all of the fluids and I haven't tested it yet.  The transfer case motor was hard to get to so I didn't change it yet.  The technical bulletin and limited warranty information said the primary cause of the transfer case issues was bad fluid.  So I changed all the fluids, ALL of them.

 

Here's the interesting and mildly disturbing thing.  The rear diff, transmission and transfer case fluids were all dark brown, smelly, gear oil.  About what you'd expect from 80K miles.  The transmission fluid I pumped in, and all over myself, is yellow and called gear oil (Getriebeöl). The transfer case was also yellow but a different part number. 

 

The PDK fluid I drained was clean, relatively new, and yellow. The new PDK fluid from the local dealership is greenish.  The PDK drain plug was missing a crush ring.  Coincidentally, when I first got the Macan @40K miles, it was also missing the crush ring on the oil plug.  The dealership mechanics were deficient and the underlay was soaked in oil.  (They also put the brake rotor with the big R on the left side.) 

 

Is it possible I've driven 40K miles with the PDK full of gear oil courtesy of some used dealership mechanic?  I've always thought the PDK was a little sluggish... I'm almost excited to see what happens. 

Edited July 30, 2023 by ARModen