ABS help !!!

ABS is a pain in the butt when it goes bad....on my Century the fuse panel, relays and modules are behind the drivers seat in the sidewall behind a door. No clicking at all sounds like either a bad relay(s) or no power to the module or the module itself. Check all the fuses and if you can figure out which circiut is providing main power to the module test it for power. On mine for some reason the main power lead was dead but fortunately there was another unused fused circuit so the tech was able to run another wire for main power to the module but the module was bad anyways......sooooo $1800 later......well you know the drill!! We never could figure out why the original main power lead died.......

 

On my 99 star the abs ecm is mounted underneath the drivers seat area underneath, the truck. Mine cycled but the lights on the dash stayed on, had to replace it. Very $$$$$$

 

That button is to test the abs circuit. Just like cootr68 said, best way to see it would be with your driver side door skirt off but you might seeing but putting your head on your side box and looking up to the floor of your cab.

Your dash/gauge control box is located behind your dash panel. You pull the four screws out holding the gauge panel there and when you pull it back you'll see a bare aluminum box mounted to the back framing of the dash. Not sure how much of that box or if it has any abs control or not but if you ever have problems with your signals intermediately working then its the harness going into that box (think second plug down from the top)

 

Go in the truckstop and buy a replacement Bosch relay. Should be 10 bucks or so. With truck off, swap it for one of the relays in your abs panel. Turn truck on and see if it abs comes on. Cycle and repeat with the other relays until you find the bad one. If it still doesn't work you have other issues.

 

Good post fcg.....also if I remember right if you have power to the module and the module is good when you push the test button it will flash a code(s) if there is something wrong....write them down and run it by your friendly dealers service manager or look online.

 

Make sure you're using a known relay that works. For example if your electric horn works use that relay and put the relay you swap with it in the horn position to test it.