Low beam lights decided not work last night. 2007 LS. I have checked fuses and relay, I have replaced bulbs, still no go. High beams work, as do tail lights.
When I toggle the light switch parking lights work but no low beams. When I leave the switch with lights on I get the headlight on warning, but no lights.
Any other suggestions or help appreciated. Thanx Keith

 

Just to be sure you know about all of them: Underhood fusebox - fuses 31, 65, 66; Relays 28, 71. Not sure, but doesn't sound like a problem with the switch or the light sensor.

 

Thanx for the reply RJ RS SS 350. Fuses 31,65,66, Ok Exchanged relays 71 & 28. Still no go.
I believe low beams were on as running lights previously but now only parking lights. (I know my 2006 only uses parking lights as DLR.)
Also when I use the key fob to open the door the lights come on, then off when I open the door, as they should.

 

If yours was built for Canada it may still use the parking lights for DRL. Fuse 31 relay 28 are for DRL. Except 2006 is different and they may have used 2006 on your 2007; relay 68 is parking lights. Look at the label under the cover. The headlights wiring is totally different in the 2006 US cars, I think I remember hearing that 2007 Canadian cars have the same DRL as 2006.

DRL only come on when in gear.

If you just leave it on auto do the low beams work in the dark?

R and L have different grounds.

Looking at the schematic, I can only see either fuse 66 or relay 71 being the problem for a US 2007.


These are the relevant parts for 2006, check and see if this matches your reality.

 

Thanx for the reply donbrew.(It is a 2007 LS that has the problem) When in auto in the dark I have no lo beams. Only parking lights in drive. I was sure after 2007 here the lo's were DRL.
I will check fuse 65 & 66 and switch out relay 71 again. Like I said when left on in manual I get the warning chime that lights have been left on. All else seems normal except no lo beams.
I am going to leave battery disconnected over nite to see if a reset will work. Will keep you posted. Thanx all again for the help.

 

I swear I heard that Canadian models use the parking lights.

Get a VOM and check the fuse box side of the relay.

 

My 2007 LS uses the headlights for DRL's X2 on the ground wires!!

 

X3 on ground wires

 

Thanx for confirmation Oldblue, I was sure the lights were on a few days ago. Now only parking lights when in drive. If it were a ground problem wouldn't it affect hi's also?
When I use the key fob to open the door the lights come on

donbrew how do I check fuse box side of relay? I have a VOM meter.

 

The relay pins will be labelled with numbers they are standard.
86 will be the on signal 85 is the ground. 30 should be hot 87 is hot when activated.

Obviously probe the board side.