Daniel Evans Posted April 4, 2016 Report Share Posted April 4, 2016 woke up this morning to a dead battery. Found the air pump for rear suspension was staying on. Pull the relay so it would not drain the battery and released the air in shocks (all the way up). Bad sensor? Bad relay? Link to comment Share on other sites More sharing options...
Cadillac Jim Posted April 5, 2016 Report Share Posted April 5, 2016 Could be either. Looking at the schematic for the 2003 Seville without the magneto rheological shocks, you have two fuses, both in the rear fuse block. The 30 Amp ELC fuse (number 64) disconnects power to the relay and the exhaust solenoid, so if you pull that one and the battery drain stops, it's either draining from the relay or the solenoid. You can pull the ELC relay (number 55) to be sure. But a bad height sensor will cause the relay to be powered all the time. If the ELC module grounds the YEL wire on terminal C10 of fuse block connector C3, that turns on the relay. The height sensor is part of the ELC module. I believe that the 20 Amp MR CVRTD fuse in the rear fuse block powers the ELC module, so if pulling that fuse stops the battery drain while the ELC fuse is in, it's the sensor, which is part of the module. If you *do* have the magneto rheological shocks, the only fuse is the 30 Amp ELC fuse. You can pull that and the relay separately to see what happens. But I would start by making sure that the sensor was connected to the suspension properly. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
Daniel Evans Posted April 5, 2016 Author Report Share Posted April 5, 2016 Thanks for the info. pulling the 20 Amp MR CVRTD did the trick. I checked the connections on what I assume is the ELC module mounted to the lower control arm on the left rear and it looks ok. do some more digging. Link to comment Share on other sites More sharing options...
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