It seems like the ABS problem I wrote about \[before\](https://drewb.com/post/6/fixing-abs-on-my-1995-vw-passat-vr6-wagon) has nothing to do with my ignition switch, and more to do with the Left Rear ABS Outlet Valve.

I set up a VAG-COM diagnostics system using \[Ross Tech's Key-Com\](http://www.ross-tech.com/vag-com/) and an old laptop. That enabled me to download all the fault codes the car has stored since the last time it was in the shop (8 years, or so). The good news was that the engine and other systems only showed a low battery voltage. This was probably from when I came back from not driving the car for several weeks while I was in Thailand.

The bad news was that the ABS system reported "ABS Outlet Valve; Left Rear (N136)." I cleared the codes, restarted the car, noted the ABS light stayed on, and then checked the codes again. It showed the same fault.

I then tested the wiring from the ABS Control Module back to the valve and it showed an open circuit (should have read between 3.5 and 7.5 Ohms). So, I checked at the 15-pin connector on the Hydraulic Control System between pins 1 and 6. This showed open as well.

That's bad news because it means the problem is inside the ABS hydraulics module. Not even the dealer will open that up, and it costs $1500-$2000 for a new module. If it's just a loose wire, I could fix it. I'm tempted...

Today, the ABS light was off all day long. I didn't test to see if the ABS system actually worked (not easy to find a slick surface). Hmm, maybe just testing it made it feel better.

(78,400 mi)