SOURCE: headlights don't work, low or high beam-
Light switch bad or check all head lightrelays . 2 dim ones and 2 high beam ones. one is bad.
SOURCE: 2002 Impala, headlights work however they blink
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.
SOURCE: 1993 eagle talon headlight problem
1st, it is not normal on this car for the lights or your cluster lights to be on during the day. It has no sensor for day/night and was not an option on these cars.
Sounds like someone has rewired your lights somewhere to run when the ignition is on. If you are lucky, you 'll be able to recognize a difference in a stock wire harness and an altered one. If it was done, more correctly, it will be much harder to find. It may also be under the driver side dash at the console.
It will be from the multi-position lightswitch to an ignition wire. A wiring diagram would help. Be cautious though. This may have been done to bypass a non-working switch like the connections you found.
SOURCE: My low beams work on my headlights but my High beams wont come on
Take a look at this link regarding DRL system. I know it's not exact truck but most of it would apply to yours too. It should give you hints on what to test & how.
http://www.fordf150.net/howto/drl.php
SOURCE: 1998 cavalier headlights will not work. low or
check wiring in the front bumper for corrosion big problem relating to cavalier and sunfire
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