SLIP and TCS ON after replacing ABS relays!!

[areznik]

Guys,

Here is a short history of this problem. My Q45 '94 (152K) has thrown SLIP and TCS on about six months ago. I searched this forum and replaced ABS relays (two of them on the passenger side). The lights went off. Today (six months after I replaced the relays) SLIP and TCS they came on again. The relays are quiet though (last time when they went bad, they were noisy). What should I check for? These are just SLIP and TCS that are on, nothing else. The car drives fine as usual.

Any advice is greatly appreciated,Andre.

[texasoil]

best to run the self diagnostics and pull the fault codes

[maxnix]

Check battery with a deep cycle and alternator with a stress test.

[GseaQ]

The contacts for the relays usually will get contaminated/corroded by battery emissions from age, leaking, overcharging, etc. Did you clean everything up when you replaced the relays? When both lights are on the car will drive normally, but TCS won't work.

[areznik]

The relays that I replaced are located far from the battery (they are by the AC metal thing close to the windshield). The battery is pretty corroded, are there another set of relays close to the battery I should check?

Thanks,A.

[qship96]

The tcs relays are the 2 at the front bottom of the battery.Remove battery,clean terminals of relay connectors and install 2 new relays.The relays up by the passenger side firewall are for the starter {and abs i believe}