Electric issues after heater core leak

[Stumped89]

My heater core went out and leaked in my car. (Replaced) Now my valet lock reads on/ off continuously on info screen. High beams will not go off, keyless entry will go off sporadically and i cant leave battery hooked up because horn will blare sporadically. Could a fuse box have gotten wet or do i have a bigger problem on my hands?

[mrbrian200]

Interior electrical systems aren't designed to get wet, much dosed with antifreeze which is slightly conductive when new, and moderately to very electrically conductive if the ion inhibitors/additives added to prevent electrolysis and corrosion have broken down in old fluid past it's replacement interval.
Evaporation rate at room temperature is nil, and can instead pull water out of the air compounding issues. You'll have to get the interior good and hot for an extended period in an attempt to dry it out (which may not work) to see if issues will go away without disassembling half the interior to manually clean out all the electronics/connections.
MSDS for Volvo fluid 31439821 says its primarily 1,2-Ethanediol commonly known as ethylene glycol. The additives are what makes it special 'HOAT'. None of the additives are listed on the MSDS, apparently they aren't toxic. Since these additives are largely unknown, except for non specific "silicates", I doubt anyone outside of Volvo engineering who knows what's in it can speculate what the effects short or long term might be on the electrical system or what may be involved in clearing it.

[MadeInJapan]

This is a known issue...where the CEM (this is the fuse and relay board) sits under the glove box tends to get wet when the heater core goes. Some have even begun wrapping the CEM as pro-active prevention if/when the heater core goes. My suggestion is to.
1. Disconnect the battery.
2. Take the lower panel on the passenger side off and slide the CEM down...
4. Check for any wet spots or what was once leaked on areas...
3. Unplug the connectors 1 by 1 and use an electrical connection cleaner (sold at Radio Shack..maybe even your auto parts store- you might even need some q-tips) but be very careful- some of the pins are very delicate.
4. Re-seat all of the connectors once they are cleaned.
5. Give things time to dry- to make sure.
6. Reconnect battery and see if things are any better.
You are very lucky if your heater core dumped on your CEM and you haven't had total electrical failure. I've read where the entire CEM and related connections get fried.