Why is everyone so quick to blame the computer? If everything else works well when the car is running I would not even consider the computer to be the source of this problem? First check the battery. Some older batteries can have internal shorting that slowly drains the charge. Also check the alternator. If you have a diode problem it could be draining the battery. You'll have to find out where the current drain occurs before jumping to the conclusion that you have a computer problem. Especially check after-market installed equipment. To check if the alt. is the cause of your drain. remove the (-) wire from the battery (use a new or charged battery)hook an amp meter to this wire and the other wire from the meter to the ground post on the battery. turn on the meter to read DC amps 0-40. DO NOT START ENGINE. The meter should read around .4 or .7 amps. If the reading is much higher (mine was 5.6) remove the wire from the alt. if the amps drop then replace alt.
I had this happen to my 1999 town car. There is a computer lighting module which controls the action of the lights. A bad module causes lights not to respond to switches ( the switches don't turn on the lights directly, but send a signal to the computer lighting module). This unfortuantely is an expensive replacement.
just had this problem with my 2002 durango, the mechanic ran it on the computer and nothing showed up so he disconnected the battery and then reconnected it and everything works now. The headlights, locks, panel lights, interior lights, locks, rear wipers all run through the body assembly moduale. Hope this helps you.
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