2005 Chevrolet Impala 3400 V6.
Question = Dash light went out and tail lights went out at same time. I have brake lights  and turn signals. I can't find a fuse for either. Any Suggestions?
I wonder, but have done nothing about it, but what the photo cell on the dash has gone  bad. I can't find a way to turn off the DLR or parade dimming. Any suggestions?
If referring to the back-lighting of the dash, these and the taillights are two different  circuits. Although they have a few things in common.

check the fuse labeled 'rear park lp' in the passenger side fuse block. This is  behind the access panel on the side of the dash with the door open.

The 'park lp relay' feeds this fuse, and also the front park lamp fuse, so this does not  seem to be the problem. The relay is controlled by the body control Module (BCM).

The dash backlighting is also controlled by the BCM, from an input from the headlamp switch dimmer. Also check the 'str col' fuse in the left side fuse block.   As you can see, these are pretty complicated circuits. Check all fuses to play it safe. My experience and my gut tell me the most probable cause for these problems is the  headlamp / dimmer switch. This is a common part in these circuits, and have replaced  several over the years.

Without getting into a lot of test light and volt meter tests, you  can pull the switch out and look for a burned connector on the back of the switch, or  even see if the switch smells like burned electrical smell.
2001 Chevrolet Impala 3.4L V6.
Question: Electrical problems,all lights on in daytime,no interior lights battery rundown relay clicking so much kills battery. Pull 10 amp fuse on bcm fixes lights for a while. Where is body control module and what does it do.
This does sound like a bad BCM. It is located under the drivers side of the dash, just behind the emergency brake, up along the firewall. If you replace it, it will need to be programmed to you vehicle. Programming sets vehicle option and theft / security data.
1999 Chevrolet Lumina 3.1L
Repairs for this problem = Replaced Multi function switch replaced and Headlight switch replaced.
Question = Day time running lights and headlights are not working. Dash lights not working, dome light not working. Parking lights are working. Brake lights are working intermittent, must have a turn signal on for them to work. What part needs to be replaced or where is the most likely sight of a wire short.
You have multiple problems causing different lights to not work. Your brake light problem would be solved by replacing the turn signal switch in the steering column. Having to have a signal on for the brake lights to work is a dead giveaway. See this many times, and have replaced many t/s switches for this problem.

As far as the headlights and daytime running lights, make sure all the fuses are good, there are about 4 fuses for the lighting system. Also there is a headlamp switch
circuit breaker that could be bad. If none of those check out, I would go with a Daytime Running Light Control Module. It is located under the dash. That might fix the dash lights as well, but if not, I'd look for a blown fuse for that too. Usually the CTSY fuse, short for 'courtesy', is for the dome lamp and dash lights.
2000 chevy impala.
Question = where is the headlight relay located on a 2000 chevy impala.
The headlamp relay for your Impala is located in the left hand fuse block in the dash. If you open the driver's door, you will see a panel on the side of the dash that is labeled 'fuses'. Pull this cover off and you will have access to the relays and fuses in the fuse block. There will be a diagram on the inside of the panel to tell you where each one is located.
2005 Chevy Impala Dash And Tail lights Went Out

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