stevodude2008

I drove home from my friends house 15 minutes ago.. and I noticed my abs light whent on and when I got home it wouldn't turn off. All you hear is a buzzing noise coming from the abs unit. Please help!!

jacobcartmill

iTrader: (6)

same exact thing happened to me a couple days ago!

stevodude2008

Like my brakes still work amazingly, I just hope it isnt something major

jacobcartmill

iTrader: (6)

i think it's just a short in the ABS pump causing the motor to run constantly.

i have mine disconnected currently (the power plug is over by the pump by the firewall) until i figure out exactly what it is.

Sled Driver

iTrader: (9)

The ABS pump motor relay is stuck. There are two relays under a black plastic cover on the ABS.


Short story......................


I got the ABS light & experianced massive front brake lock up after the finish line at a autocross event.

When I opened the hood I could hear the ABS Motor running. Even after I shut engine off & removed the key, the ABS Motor continued to run.

I pulled the ABS fuses (40 & 15 amp) from the fuse/relay box near the left strut tower. This shut the ABS Motor off, but I still had the light & some serious front brake bias.

With the engine still off I put the fuses back in & the ABS Motor started running again, so I pulled the fuses to save my battery. After a while (1/2hr or so) I put the fuses back in & all was back to normal. It stayed that way for a couple of months.

Then during a lapping day I got massive front brake lock up (the right front tire taking the brunt) & ended up flat spotting my R compound tire to the cord. The F*cking ABS light was on again. Back in the pits, with the hood up, I could hear the ABS Motor running.

The ABS Hydro Electrical unit (r/h corner of the engine compartment, has two relays under the black plastic cover. One is for the Pump Motor & the other is for the Valve.

I removed & tested both relays on the bench with voltage. They operated normally. I heated the Pump Motor relay up to 250' F & applied voltage. The damn thing stuck closed. After it cooled down it snapped open.

That's why the system would return to normal if I waited prior to reinstalling the fuses.

During normal street driving you don't cycle the ABS much, if at all. On the track it must be cycling & generating a bunch of heat (due to high resistance & poor contact).

Summary?

I replaced both relays in the ABS Hydro Elect unit. They cost around $60 for the pair. They originals lasted 13 years, not to bad in my book.


ABS Motor Relay: NA23-43-7A2
ABS Valve Relay: NA23-43-7A3

jacobcartmill

iTrader: (6)

wow very good post. thanks a lot for that info. i'm quite pleased to see the pump is not the problem

edit: i plugged my pump back in and it is not stuck on. i'm sure after heating the relays up a few times it will get stuck on again.

stevodude2008

yah I just disconnected my battery overnight and my car worked fine today :s

OTT

iTrader: (1)

About a month ago the same thing happen to me minus the brakes locking up, I unhooked the battery, pulled the fuses, reinstalled them and has worked fine sence. That's some great info SLED DRIVER, Thanks.

Oun

iTrader: (3)

there is a big fuse thingy in the box right next to the abds pumps. would it disengage the abs if i pull this fuse?

Azcamel

iTrader: (1)

any install pictures of the abs unit that you replaced, mine just happen right now and this thread is awsome.