Originally Posted by Styx
I had the EXCAT same problem... try to pull the relay for the power antenna... the long version is my 94 se got to t point if it sat for over 11 hours I could not start it... it finally went into the garage and the tech could not find a problem but on a whim he pulled the relay and the car has worked fine ever since... I just wished we had done that before it ruined a battery.
YES, I have seen this on a similar GM vehicle. If the antenna does not go down completely all the way to the stop, the relay in there will intermittantly try to lower the antenna. And it will do this forever. The one I worked on would try for about 15 seconds and then rest 15 seconds. It would draw 4 amps while trying. This will kill your battery in a day or two.
The way to diagnose these problems is to disconnect the battery and put a DC ammeter in line with the battery. With everything off, including all bulbs, you should have very little current, usually less than a tenth of an amp, depending on the car. If you see more than this, they you can try pulling fuses and such until it goes away. If you read as much as a couple of amps, then whatever is drawing power should be warm to the touch, because 2Amps x 12 volts = 24 watts. Just don't try to start the car with the ammeter in line, unless you want to see it go up in smoke.
1992 green ssei. Tan leather, moonroof, power everything. 161k miles
Goodyear RSA Plus 225/60/16 VR on chromed factory crosslace rims. McGard chrome lugs.
Audio system: CD player w/equalizer, subwoofer (all stock).
Delco premium wires, NGK TR55 plugs, K&N stock style air filter. Ceramic brake pads. New rear brake tubing and proportioning valves. New wheel cylinders, front rotors and calipers. New front wheel bearings. Replaced crank sensor and harmonic balancer. Rebuilt instrument cluster. Cleaned A/C evaporator. Valve cover gaskets. Alternator. Front stabilizer links. Replaced all power steering lines and transmission lines. Cleaned MAF and IAC. New door appliques. Rebuilt steering gear. CERAMIC brake pads, I love them. I am listing all this in case someone needs advice on any of these repairs.