Service Electrical System Warning

drfong said:

Hello all,
My 02 STS just decided to give me a warning light "service electrical system"
The cruise does not work and the raction control light is on on the dash. The cruise power button on the steering wheel turns on and off (the light on the switch) but the cruise does not engage and the "cruise" light on the dash does not come on. I checked the fuses in the block under the hood and all of them are good. The warning message, traction control light and lack of cruise all happened together. I do not know what was going on when it happened as my wife had the car.
Any ideas on where to start would be appreciated.
Gary

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Check your voltage when running

drfong said:

....Any ideas on where to start would be appreciated.
Gary

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The only place to start is displaying Diagnostic Trouble Codes and posting the results. Scroll down just a little on this page to learn how to display the codes on your year/model;
http://www.cadillacforums.com/forums/cadillac-tech-tips/55172-how-pull-codes-got-codes-warning.html

JimD said:

The only place to start is displaying Diagnostic Trouble Codes and posting the results. Scroll down just a little on this page to learn how to display the codes on your year/model;
http://www.cadillacforums.com/forums/cadillac-tech-tips/55172-how-pull-codes-got-codes-warning.html

Click to expand...

The page location has changed within the hour; here is the new location;

http://www.cadillacforums.com/forums/cadillac-tech-tips/172511-how-pull-codes-98-04-sevilles.html

drfong said:

.... D1574

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There are no "D" codes. You mean P1574.

....B1327

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Have you addressed this situation? B1327 is telling you the system voltage has dropped below 9 Volts and that usually means a failed or failing battery. When the system voltage drops below 9 Volts, all the system modules become unreliable and can/and do set false/erroneous/misleading codes.

The only one that said Current was: PCM P1574

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P1574 - Stoplamp Switch Circuit
You might have a brake pedal switch that is not adjusted correctly. That would affect your cruise control operation.
Try lifting the brake pedal with your left foot when you attempt to engage the cruise.

There is not much more you can do until you have codes to get you started in the proper direction.

I did have a battery go bad a while back. It has been replaced and I have not had any voltage issues since. Most of those codes may have been back from when that occured. I'll see about the brake pedal switch thing and hope that is the problem with the cruise. Is it a seperate switch from the brake light switch?

I'll drive it around a while and see if any codes come back.

Thanks

Clear all your codes to get a fresh reading.

After clearing the codes and driving a while, ABS C1294 and IPC U1016 History are the 2 codes that came back. The traction control light came back on and the cruise still does not work. I tried pulling up on the pedal but that did not do anything.

Thanks

JUst looked up the C1294 and it looks like it would be a brake switch bad or out of adjustment. Any recomendations as to correct way to adjust and test.

Update

I went to check the brake light switch and thought if the switch was on all the time my brake lights should be on. So I checked the brake lights and I had none except the ones across the trunk. Both main brake lights were out. I replaced them both and no all the lights work. I think maybe with both lights out it triggered the C1294 code. I reset everything again and I'm getting ready to drive home. We'll see if it fixed everything.

Just an update. Replacing both brake light bulbs fixed everything. Cruise now works, no more codes!

Thanks for the update. One day soon you may want to pull the push pins holding the carpet liner to the trunk lid and remove the 10 (11 ?) nuts holding the light/license bracket to the trunk. Replace all those bulbs, too. Here's what mine looked like after 6 years......You MAY need 2 1057/1157 old style bayonet base bulbs (not shown) in addition to the 3157 & 194 bulbs. (One of the 4 clearest bulbs, bottom row, is burned out.......)