1999 C5 weird problems - won't start,

Drove through rain yesterday, parked in garage, tried to start it that night and would not start, check tire system, check engine, reduced power, hatch would not open elec, some light inop others fine.

Changed battery, cleaned chasis grounds I could get to, found corrosion in plug for 'under hood light' - cleand it,

Car started, turne it off went inside to get receipt for battery and same problem as before. No starter at all.

The lights are check eng light, and the words are tire monitoring system, reduced power, low fuel, brake before shifting, service engine soon.

Had an oil change a week ago. Very heavy rain yesterday coming home.

any help?

 

http://forums.corvetteforum.com/1579755334-post31.html


If you have 12 VDC on the TDR relay,, find a 3' long metal rod,,, insulate it with electrical tape,,, snake it down thru the passengers side of the engine and THUMP the starter while someone holds the Key to start.

If its the solenoid causing the issue, that will cause it to crank.

BC

 

I believe all those lights would be on if the engine is not running. I would check all the external grounds

 

Thanks for the replys - tried

No luck 'wacking' solenoid.

Cleaned grounds I could find. Where is the BCM ground? any pixs to find grounds on the web? Book?

Replaced battery - no luck

Read a post about the BCM - cleared all codes except SCM B2860, it would not clear. (telescoping SW switch has not been working in the memory settings for months but the switch works) - pulled fuse 25 in the fuse panel next to the BCM - put it back in and she started up no problem. Post seems to indicate it was a bad BCM.

Drove it for 30 minutes - no problems.

When shut down and restarted quickly starter turns the engine over, plugs pop but it acts like no fuel. No problems on the display and all the normal stuff was working. BCM again?

Wait a few minutes longer and it's back to no cranking with original codes and words. Fuse 25 cranks it again.

The BCM - NO COMM code could that be something causing the BCM to not 'wake up'?

 

You need to post your codes. The engine will never start with a BCM "no comm". Have you inspected the BCM for moisture? That would be the first place to look, considering this started after driving in the rain.

 

Follow up - right after I sent the last post about the BCM. I went back to the garage. Found the car still not starting, got my second key and FOB. Did the trick with the #25 fuse started it shut it down, cleared the codes and started it back up fine. shut it down removed the key.

Restarted it twice more and noticed I'm hearing a clicking from the BCM now when I put the key in and take it out that I did not hear before.

Waiting for an hour and going back.

Still getting the SCM code for the telescoping Switch but no words on the scroll.

Geeze, I hope it was the key. I can not afford a 1000+ bill. this soon after Christmas!!!

Anyway, I thought I'd introduce myself a bit.

First time vette owner at 62 years young - always wanted one after driving a 427 C2 Vette but either didn't have the money or had to many kids or was overseas. Used to buy 2+2 Z's as a substitute.

Spent 25 years in the Army flying helicopters and as a test pilot.

Ran a CAD CAM 3D business after I retired until my eyes couldn't do the detail work anymore.

Now a Continous Improvements manager with Goodyear.

Still having fun.



I do have some digital/analog electronics training on acft systems and lost of mechanical knowledge on aircraft.

As most will know, acft knowhow doesn't mean a whole lot when looking under the hood of a car now days.

 

[QUOTE=lucky131969;1579805410]You need to post your codes. The engine will never start with a BCM "no comm". Have you inspected the BCM for moisture? BCM was dry and did not see any problems with plugs to BCM
Started it again after an hour and back to no starting. The key makes no difference. Was hoping that was it.

CODES
BCM - No Comm
SDM U1000 , U1064
IPC U1176 , U1160
LDCM U1064
RDCM U1064

Warnings: Reduced Eng Pwr, Serv Tire Mont Sys, Low Fuel, Check Tire Press, Serv Eng Soon, Break before Shift.

 

From the Codes and warnings, you either have a corrupted class 2 serial data buss OR a damp/corroded/wet BCM.

Check for a wet/damp passengers carpet underlayment and a damp BCM.

BC

 

Dry as a bone. BCM looks dry but that doesn't mean much in Georgia. May be corrosion. Is the BCM ok to remove and open up?

 

Check under the driver's seat for moisture in the carpet there as well. You have a serial data line there as well as the seat and telescoping steering column things going through those two connectors there. The blue 7-pin connector is for the steering column for the most part and the pins/sockets can losen up over time, causing problems for the column.

 

Verdict from shop - BCM bad.

$1500.00

Pick it up tomorrow.


%$^^%##$%%#$#@@

 

Request they give you the old one.

 

Experiencing the exact same problem in my 1999 hard top. Rained really hard one day. Noticed water on the passenger side floor. After a few no starts, driving and no starts it just died completely. All of my little tricks did not work anymore. I wiggled battery cable, replaced battery, checked all the grounds and nothing changed. After much research I concluded it must be the BCM. In the process of replacing. Keeping my fingers crossed.

 

So did you pull your codes and have no com for the bcm. The op never said if the new bcm fixed the problem. The code does not necessarily mean the bcm is bad. If the bcm was wet then that is probably the issue. Let us know how this turns out.

 

I had already removed the udders a few weeks prior while replacing winshield wiper motor. They were seriously plugged. Have not used the AC yet. But will check drainage tube for a clog. Thanks for the feed back.