rotorheadcase

I'm chasing the cause of the dreaded ABS/PDAS warning light and alarm and I'm trying to confirm that the control unit is getting power. I believe that there is a piggyback lead directly off the +ve battery terminal and I indeed have two red wires attached but I'm pretty sure they are supplying power to the two upgraded headlight relays so it's possible that when my local shop installed and connected a cutoff switch in the frunk that they inadvertently removed or cut the ABS power wire.

Anyone know which pins on the ABS connector plug would show voltage to the control unit??

I'm getting ABS/PDAS and the audio warning (19 beeps) and they remains lit continuously. I've bled the abs and PDAS systems, change accelerometers, confirmed 1000Ohm on all speed sensors at the plug, battery vcoltage at start is ok and fluid is a full. Durametric says no faults

Thanks for any help you can shed.

Neil

ras62

Term11 on the ABS unit is the 12v feed and 1 which comes via the R34 ABS relay. Both fed by Fuse 16.

rotorheadcase

Awesome, thanks very much!!

Neil

John McM

It would be interesting to know if the ABS unit warning system has the same transistors as the spoiler controller and HVAC that cause them to false alarm.

rotorheadcase

John, I also have a spoiler warning light at the moment but don't know if its related to my ongoing issue or not. Spoiler mechanism works as advertised and goes up and down at the correct speeds. The duck tail is going on this weekend so it's not something I'm losing sleep over but yes, it would good to know if the problem is caused by a common component used by Porsche at the time.

John McM

Neil, send me the spoiler controller unit and I'll fix it. It won't be the cause of your ABS issue but it's still good to keep everything that belongs to the car working.