Help. Both my 12volt and the IMA battery drain over night. 2003 Civic
 

I have a 2003 Honda Civic hybrid with 220k on the clock. Initially I thought the IMA battery was dying or dead. It drains both the 12volt and the 144volt IMA battery overnight. I have little money into buying the car but now I have a new IMA battery and I have used two new 12volt batteries with the same thing.

My ABS system according to the codes. Not sure which ones now. But they Ses light IMA light and ABS light all were on. A used ABS modulator fixed it for two weeks and the lights were off, and both batteries held their charge. Then. I had a fellow mechanic run his diagnostics and clear the codes and bam it has been doing the same thing. I tried another ABS modulator and it did nothing.

So I have been reading into the ABS relay and the AC relay causing these drains. What do I need to look for and would this be the right direction. I'm not thinking it's the ABS modulator any more.

Please lend me a hand I really would like to be using my Honda and saving gas. The salvage yard will warranty the used part again do I try another one?

How do I tell if the ABS modulator is really bad and besides Honda is their a source for a new or rebuilt one. Or have mine rebuilt?

Thanks,