Hello all.

I have a 1992 Corvette that I took on a road rally today. The car ran pretty decent but had this annoying slight random misfire. I think I know what's causing that and will be fixed soon.

Here's my problem. The rally was about 300 miles (I know, long), anyway, I was about 230 or so miles in when I had to brake hard around a turn (a couple of the cars ahead of me went off the road). The service ABS and service ASR lights came on, I didn't think much of it until we came to our next stop. I shut the car off, talked to some ppl, etc. Some time passes and I get into the car and turn the key. I hear what is definitely a relay clicking on and off really fast behind the dash, (sounds like it's in the passenger relay area, but I cannot figure out where) accompanied by the service ASR and service ABS lights flashing, but they go out and all seems well. I then go to start the car and, no start, no crank. So I turn the ignition key off and on again and push the clutch down harder thinking I didn't trip the interlock switch. Car fires right up, and the service abs and asr lights come back. I go home but go to get food first (this is where I notice the problem), I go to restart the car, service ABS and ASR flicker again and the relay is chattering away, and the car won't crank. I turn the key on and off probably 5 times and the car starts fine.

I pull the codes
Module one H27 (that one is new), H74 (aftermarket radio)
Module four H55, H64 (a clue to what's causing my misfire)
Module nine H63

I erase the codes and restart the car, starts great but the Service ASR and ABS lights are still there. I go to pull the codes, none of them come back. I check the H63 relay at the ABS pump and it appears to be working (clicks on when the key is turned on). No blown fuses in the main fuse box.

I am completely stumped. Any C4 electrical wizards feel free to chime in.

 

Because relay clicks doesn't mean it works. You might check that it's sending battery voltage to pump or just replace it. The contacts can corrode or pit over time.

 

True, but I am less worried about the solenoid relay and more worried about the relay that was clicking behind the dash and the car not starting. I won't really miss ABS or ASR (if I can fix them great, if not oh well), but I don't want to be left stranded somewhere.

 

ABS ASR module, valve block, and relays are in.well behind drivers seat. IDK what you're hearing behind the dash.

 

Yes, that controls the ABS pump itself, but the whole thing has got to get power from somewhere. I can't seem to find a full wiring diagram of the system, and I still don't understand what ABS or ASR has to do with a no-crank condition, maybe they both get power from a common location? I swear the wiring in this car is so confusing, I've worked on German cars less confusing, but then again I had the full wiring diagram. Also, why would the ABS and ASR lights be on with no code?

Thanks for your help!

 

To DIY I would get factory manuals or subscription to alldata. With the starting deal I would have battery tested. Be sure cables aren't corroded. There was a time when battery terminals would leak acid corroding battery cable terminal and wire. Low voltage to the modules will set history codes and cause relays to clatter.

 

I would be interested in what you find out. I've been having intermittent ABS/ASR lights on my 94. No relay clicking, though. I've replaced brakes and some other work and flushed all brake fluid and bleb the ABS/ASR while I was at it. Hopefully that solves my issue.

The ASR does effect the throttle and ignition (think it only retards it?). I don't know if it's causing a hard or no start with yours. When my lights have come on it makes it run like crap until I turn it off and restart.

 

Yea, that would make sense if none of the electronics were working but the problem seems isolated to the ABS/ASR and my no-crank condition. Plus the no-codes things and the lights not going out anymore are confusing me.

 

The weird thing is it doesn't seem to be affecting anything but the no-crank condition. The engine starts and runs about the same as it always has, except when that relay was clicking and that's why I believe its related. But now the lights come on and won't go off at all and the car starts and runs fine. Also, no codes in module 9 which is confusing as well.

Thanks for your reply.