Head lights at night

[minivolks]

I bought my daughter a 2000 red s10 LS 4 cylinder with 98,000 miles on it. Few dents and scratches but runs great and the A.C. blows nice and cold. I am very handy when it comes to working and diagnosing problems. The used car dealer let me use his lift cause the truck needed a fuel pump, fuel gauge didn't work. I also did some interior work. Under hood the throttle body got a good bath.

 

I would like some help diagnosing why the automatic lights don't come on. The daytime lights work and I can turn them off by pushing the button on head light switch four times. However, when I put my hand over the ambient light sensor the headlights do not come on. I tested the sensor with multimeter and it is responding with the correct values. 5 volts on gray wire and 1.7-4.7 white wire. light state While .2-1.0 on white wire for dark state. I kept sensor plugged in, with key on, and stuck wires with the multi meter leads.

 

I have the haynes manual with schematic of lights. Could be relay, parking brake switch or, this is strange, the schematic shows a wire going to abs, but it ends. No more info on that in book.

 

Regarding parking brake switch, while depressed the light shows up in instrument cluster.

 

So, here I am, a new member. Looking forward to some conversation. Brian

[Colossus]

Welcome, Brian. Hopefully we can figure something out here. Usually the cause for what you are describing is that little R2D2 failing or having fallen in the dash but sounds like you may have ruled that out, none the less- if you can find a new one it still may be worth swapping out.

[minivolks]

I was thinking that to. Just buy a new R2D2, as you say. I'll try it, what the hell. If it works I'll blame my multi meter skills.