I leave my display set to metric (live in Germany) and to show fuel usage - liters/per 100 km. When I start my 99 coupe up after sitting overnight or for a few hours, the display has been reset to English and odometer. If the car is stopped for a few minutes, it doesn't happen. This started over the last week or so and I have searched the forum for about two hours now and can't find any similar posts. The only other problem I have had is with the key fobs not holding their codes after syncing and retraining but I have learned to live with that one. Anyone else had the display reset issue?

 

check your battery, sounds like its getting weak! Goodluck!

 

check your connections to the battery first and then check the battery, sounds like one of the "warnings" before the battery says goodbye.

 

 

Interestingly, my car used to do that once every week or so but since I replaced the stock stereo with an aftermarket unit it's been fine. Maybe in the process of unhooking and re-attaching the battery for the install I made the connection better.

Might just be a coincidence, too.

 

Thanks everyone for the help!
Suzanna

 

i had that issue with a regular lead-acid battery i used to have in there. i switched to an optima red top and it has never happened again.

 

I realize this is an old thread, but I found it while searching for my problem.

When I started my 2004 daily driver this morning, I found the headup display had reset to the default, and the DIC showed the odometer display rather than being blank.

However, the radio and seat memory settings were retained.

I had replaced the original battery with the OEM AC Delco battery 10K miles and fifteen months ago for a "charge system fault" error, (which, BTW, didn't stop the error message.)

The battery measures 11.4 volts at the mounting posts static and 14.5 volts running. The volt meter gauge has been reading 13-14 volts consistently.

I have been off the last two weeks so it hasn't been driven daily, as usual, but still, here we are.

Any thoughts?

s'noJob

 

[QUOTE=Fourtrax250R;1554175401]check your battery, sounds like its getting weak! QUOTE]


My 04 was resetting itself, a new battery solved the problem.

 

I agree, check the battery. It is a known problem, when cranking if the voltage drops below about 8.5-9 volts, these "temporary DIC memories" will be erased.

Your (s'noJob) readings show a completely discharged battery. A 12-volt battery will measure at about 12.9 volts when it’s fully charged and about 11.4 volts when it is fully discharged. Try charging your battery first, if it fails to "take a charge" it is bad.

If it holds a charge, then get a load test done on the battery. Most places that sell batteries will do one for free.

Lastly, you need to get that "charge system fault" checked out, your alternator could be bad. Note, if it is, get your old one rebuilt. They have special circuits in them and many "replacement" alternators won't work properly. In fact, could that be the problem with yours? Did you just buy the car or has the alternator been recently replaced?

PS - When you do get this battery "fixed" or replaced, start using a battery maintainer (one that starts and stops the charging based on voltage, WalMart has one for around $20) when the car sits more than 3-4 days.

 

Battery time!

 

Thanks, Oldvetter, I'll try that. I wonder why the radio and seat memory were unaffected - do they have their own backup power? Do I lose all that if the battery's disconnected? What about the "performance memory," for lack of a better term.

I wouldn't think that 15 months is too much to ask from a brand new battery for a 32 mile round trip daily highway commute. I guess the load test might tell if the batt's defective.

I bought the car Dec '07 with 7000 miles on it, and have never replaced the alternator, but it sounds like a test of that unit would also be in order.

s'noJob

.

 

There are "different" kinds of memory.

I agree battery should last longer, but C5's do run down batteries fast when sitting idle. You could have a problem also, you can check your car's "sleeping" amps usuage, if high you check circuits by pulling fuses. Often the electric seats are at fault. Here is a great link for that:

http://forums.corvetteforum.com/c5-g...r-battery.html

Here is some more info (from Bill Curlee):

The correct BCM current draw should be 20 Milliamps or less. Most C5 run around 25ma but I have see some as low as 15 ma.

Leave the engine compartment fuse box for last and start with the passengers compartment box first. Pull the power seat breakers FIRST! The power seats have a tendancy stay on and cause this issue.

Also pull the fuses for the Bose system amp.

Examine the car in the dark for lights staying ON.

Once you prove the interior circuits good,,, check the headlight circuits, and then test the current draw of the alternator.

Look at my electrical stickey. I think I cover this in detail in that post.

There are several COMMON things that cause excessive current draw

-Seat multifunction switch & Lumbar Switch
- Bose Amp relay stuck on
- Alternator didoes bad and drawing current
- Headlight control module bad
- Interior light on (check in the dark)
- Added aftermarket accessory not shutting off


http://forums.corvetteforum.com/c5-t...n-long-30.html

Then scroll to post #590
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Old 11-23-2010, 01:58 AM #3
Bill Curlee
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Its IMPOSSIBLE to figure out what the problem is unless you SYSTEMATICALLY diagnose and troubleshoot. Reading the current draw is the very first step.

Find out how much excessive current your drawing at BCM Sleep mode and find the guilty circuit.

If the battery is being charged at the correct voltage 14.1-14.7, the charging system is working.

Its the parasitic current draw when your NOT CHARGING thats giving you issues. If it more than 20 MA, thats the issue.

BC


Good luck !