I've chased it down to this bad ****.....so I thought. Using a amp hound & my Fluke on the ground side of the battery, every fuse cct is good other than #25 which shows .080a. Sleep draw is .210a until I pull the courtesy relay then it idles down nicely to 21ma......

I thought last season I would live without courtesy lights, the battery still would go flat within several days of being parked.

This afternooon I revisited trying to determine why the battery was still dying.

Re tested & all seem to verify last season, it's the courtesy relay cct. I started playing with the interior light dim control & some inconsistencies began to show. With & without the courtesy relay back in.

Then I pressed the light button on the interior rear view, that created some havoc with current draw. I turned the mirror lights off & watched the idle current as it went into sleep mode...it's back to .210a with the courtesy relay pulled.

Could not find a fuse specific to the interior mirror & vanity, turned them on & went with the amp hound & found #2 was the current fuse. Pulled the fuse & confirmed the mirror & vanity lights did not work.

The courtesy relay was in @ this point & sleep draw was .210a, pulled it & down the sleep current went.

I'm a little lost & my single brain cell is hurt'n

Right now I've #2 fuse pulled & the courtesy relay & it goes to sleep in the 20ma area.

Any idea's where I might go?

 

If you need the schematic for both circuits I can do that. Need your year.


Mr. Sam

 

Schematic's would be a huge help, it's a 2001

 

I fully charged the battery last evening so I have good capacity & verified what I learned yesterday.

A) Courtesy relay in & doors closed sleep current will drop to 210ma & sit there forever. Pull the relay & within 2 minutes sleep current is down to 20ma.

B) With courtesy relay removed then activate vanity or mirror interior light & turn off. Sleep current will not go below 210ma exactly the same as A. Pull fuse #2 & it idle down to 20ma within 2 minutes

C) When sleep current is 210ma fuse #19 has a 80ma draw, measuring across the fuse with an amp hound. When idle current drops to 20ma no draw accros #19.

D) All interior lights operate correctly, turn on & off.

Any idea's? It seems to be pointing to BCM that operates the interior lights.

 

Here are the schematics

https://www.dropbox.com/s/motj9f88ql...Lamps.pdf?dl=0

https://www.dropbox.com/s/jy5ka56wrp...Lamps.pdf?dl=0

Will look at your last post a little later.


Mr. Sam

 

Perfect, thank you!

I think I'm on the right track, I think either of the two cct's that wake the BCM maybe the issue. I'm not sure where the 210ma draw is, I did not pull relay 37. My guess is that the BCM does not fully turn off thru coil of the relay, pulling 37 would have confirmed that.

I'm watching that Tech2 post as I've been thinking trying one......it looks difficult to learn how tp use properly. I can get around HPT pretty good so maybe I can figure the Tech2 out

 

Using the Tech 2 is easy and I have some info I can post to help when I get home.

You can always get help here also.


Mr. Sam

 

Here you go.

http://fr.slideshare.net/obd2motor/u...mmming-scanner

Great paths info from GM:

https://www.corvetteforum.com/forums...101-paths.html


Mr. Sam

 

Tx's again Mr. Sam, I'm going check with T Vert in the other thread & see how he makes out with Tech2 he has ordered.

I'm tracking my battery surface voltage & current draw with the fuse & relay removed. Overnight battery went from 12.76 to 12.63 & in the 20ma draw area.

I found a BCM relearn procedure, does anyone know if this resets the module. My battery is disconnected over the winter months & the draw issue has been going a least a couple of seasons. I'm wondering if the re learn would work any differently than the battery disconnect?

 

The relearn only allows the BCM to "talk" correctly to the PCM for a handshake as they say.

Rebooting the BCM by disconnecting the battery might do something.


Mr. Sam