my 13 PTT headlights just stay on and the wipers dont work. i do have communication codes in my modules
000524 communication with PSM unit
000532 communication with rear end electronics unit
c13a00 communication with LIN bus

the headlight switch led doesn't light up red also
i already replaced the front BCM module right beside the PDK module

 

I had to replace my light switch on my 996 when I experienced a similar issue and it was an easy DIY - hoping it's something simple for you as well. Best of luck!

 

what was ur 996 doing? wipers and lights?

 

it ended up being the rain sensor on windshield