My 97 civic (145,000 Miles) Just started doing something weird. When running all lights on the car seem to flash or surge, they never go completely out but it looks like I am emergency traffic at night. It also makes the spedo go crazy, it will go from 0mph to 100mph back and forth, The one thing I have notice is that it seems to be better at idle.
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Re: Headlights/ dash lights flashing
It sounds like a faulty voltage regulator, faulty alternator, or a bad ground. Try checking the voltage output with a voltmeter, preferably an analog (needle) type. If the needle is "bouncing" then the output of the alternator is not "steady". This voltage variation, if severe enough, could cause your electronic meters (such as your speedometer) to perform erratically.
Also, if you have performed any aftermarket modifications to the electrical system (such as high power stereo installs, etc), temporarily disconnect these and see if the problem resolves. A stock alternator for this car only puts out around 70-80 amps. It doesn't leave much of a margin for additional current draw from high power add-ons.
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sounds like an alarm system that has the horn disconnected,so when you start the vehicle it trips the alarm then resets itself after awhile .see if there is an aftermarket Alarm system under the dash and remove it!
This may be the start of a worse problem that the Impala eventually developes. The Body Control Module has a design flaw along with the Passlock anti-theft system. You may get away with just replacing the BCM for now. It needs to be reprogrammed at the dealer and the car will not start if you replace the BCM without reprogramming it. I would also recommend against replacing it with a remanufactured one. Repair cost is going to be around $500 at the dealer.
If the Passlock system is also at fault, add another $500 for a new ignition switch and cylinder. If you haven't experienced random starting problems yet, they are coming soon. When you turn the key, nothing happens. I thought my 2002 Impala may have been immune to these problems that I've heard about constantly, however, at 90,000 miles, it became "possessed". The symptoms started slowly and got worse. Beside the interior lights flashing like strobs in the middle of the night (while the car was not running), the headlights would occasionally click off and on a few times while I was driving at night.
The relay switch you hear clicking is the Battery Rundown Protection relay. I'm suprised your battery hasn't drained to the point where the car will not start in the morning.
i may be wrong at this but i think it's your alarm system. headlights, doors and horn all connects to an alarm system (if your alarm system does this) i mean, some alarms, when you unlock or lock your car, the lights turn and horn blows simultaneously with the alarm. if you have an alarm system that seem to malfunction, it may also affect your doors, horn lights etc. have it checked or replaced.