[TimO]

Hello all,

It started off an an intermittent problem, rear windows would work fine and all of a sudden stop mid motion.
When this happened, both rear windows were stuck and didn't work from the front or rear switches.
Sometimes it would stop working for a few minutes, sometimes a lot longer - now they've flat lined.
I checked that the fuse is good and when it did work there were no strange noises.
Before I start taking panels off I wondered if there was something else I could check or do first?

Thanks for the help!

 

[TimO]

Thanks for the reply, unfortunately I haven't tried resetting the BCM yet since there is rain forecasted and I didn't want to risk it. I will give it a try when it's "safe" though.
However, The windows did start working enough to roll them up, they didn't work for about 3 days.

Something I noticed this time is the "door open" notice came up on the DIC and the car alarm didn't arm when trying to use the key fab, and the interior lights also stayed on. This was something new. I clicked the child lock on and it went away, locked the doors and that's when I could roll up the window. I clicked the window "up" a few times and heard the relay click inside the door, then it went away again.

I'm wondering if a door latch sensor is faulty?

 

[TimO]

Same problem here. Door ajar light is often on for back doors (either of them) and then randomly the back windows will go down slightly and be stuck for days. Shop in town said there needed to be reset and they worked for a week or two...now they are stuck again. Really frustrating...Anyone figure out the connection here?

Haven't figured out the connection, just lived with it for the last year and a half... Did you have any luck figuring it out?

 

[TimO]

2 years since original post and rarely using the rear windows.....

I bought an OBD2 scan tool and found the following codes while messing around with the rear windows...

U1548 00	(K9 Body Control Module) LIN Bus 4 Lost Communication With Device 8 (S79LR Window Switch - Right Rear)
U154A 00	(K9 Body Control Module) LIN Bus 4 Lost Communication With Device 10 (S79RR Window Switch - Left Rear)

These pop up and eventually disappear when the windows start randomly working again. The car still occasionally displays that one of the rear doors is open but doesn't always happen when the windows are "disabled."

Any new thoughts/suggestions?