I ask if all those things are on the same fuse, but am pretty sure they are not.

Drove the car, everything worked, parked car, got in, no dome lights, no radio, trip
meter had forgotten its mileage, clock had forgotten the time, heater
controls had forgotten their settings.

Instead of 2 beeps from locking with the fob, and getting a chirp after 3 clicks, it locks the doors but gives me 5 chirps.

Were it not for the fact the radio does not work at all I'd guess simply
it's the 'backup power' fuse, which isn't labeled as such and I have
only checked the 15A radio fuse so far (it's good).

Would you expect the radio to not work without the 'memory' 12V supply?
       

 

            I ask if all those things are on the same fuse, but am pretty sure they are not.

 

Drove the car, everything worked, parked car, got in, no dome lights, no radio, trip

meter had forgotten its mileage, clock had forgotten the time, heater

controls had forgotten their settings.

 

Instead of 2 beeps from locking with the fob, and getting a chirp after 3 clicks, it locks the doors but gives me 5 chirps.

 

Were it not for the fact the radio does not work at all I'd guess simply

it's the 'backup power' fuse, which isn't labeled as such and I have

only checked the 15A radio fuse so far (it's good).

 

Would you expect the radio to not work without the 'memory' 12V supply?

       

trip mileage is not on a fuse, so it sounds like you got a degrading battery / battery cable. 

Edited August 18, 201411 yr by eagleeye1

The memory for radio settings, last heater settings, and trip mileage all need +12V with the key off, so I assume that would be fused somewhere..

 

I'm really hoping it's not something like what you mention.

how old is the battery?

there should be date on there somewhere, either as a sticker with month/year or engraved right into the casing.

Most batteries are only good for 4 or 5 years, and the more electronics the car has, the shorter the life of the battery

 

My brother/sis-in-law have a Chrysler Town & Country minivan that goes thru batteries every couple of years - it has the remote opening doors, rear dvd, all kinds of electronic goodies.

It was fuse #2 in the engine compartment fuse box, labeled 'cabin' something or other.

 

Turns out the radio indeed does not work if the memory backup supply isn't connected.

CRAP. Fuse blew again, it might be the rear-hatch switch wiring although I did open the hatch after replacing the fuse.

Anyway, now the Security light is flashing, and the cruise light in the
switch comes on but cruise only works for about 10 seconds.

I am searching but not finding a thread where this was a symptom.

I have to drive about 8 hours tomorrow, all freeway, and the cruise MUST be working or my back will be wrecked!