Honda 2005 CRV - The left headlight is OK. The turn signal works both sides till I turn on the headlights. Then the right one does not work. that is a Honda safety feature. Non working turn signal on full lamps is to warn the owner there is a burned out head lamp. The right headlight will not burn. The bulb is good. Checked with an Ohm meter and attached the battery charger to it and it lights up. An H1 Silverstar bulb is BRIGHT. Especially right in front of you. The wiring harness that plugs into the adapter that the H1 bulb sits in is getting voltage with the motor running and the headlights are on.I checked it wit a DC Volt meter. The right turn signal works with no lights on. Also works with just the 'parking lights'. When the headlights are turned on, it goes out and the right turn signal glows on the dash. It does not look like the turn signal bulb is a multi filament. If it was then maybe it is the problem and not the headlight. I've checked the adapter the H1 bulb connects to and there is no short. Just a little confused. leaned the sockets. Made sure the connections at the bulb is making contact. Changed out the turn signal bulb this morning (5:30 am) No change yet. Still confused here.

What do you mean by saying the left side of your (singular) headlight is not working? Is the right side of that SAME headlight working? Do your headlights have dual or twin filaments in each one? Or do you mean that the left entire headlight is not working, but the right side headlight is working okay? Please clarify your opening statement.

It's possibe since much of the work is done on that side. Battery and intake need to come out on the drivers side. Possible a wire connection was left disconnected.
Check fuses too and wires at the back of the headlight.

both LOW BEAMS (you make this so hard not saying that...)
but challenging.....

is car in canada, or usa? or a?
does car have DRL. we dont know ,until you say.
and both types work different, non- and DRL.
my answer (roll dice, ) USA. no DRL

the system is simple (alldata.com)
2 fues, left and right
2 relays, one left, one right.
1 controller box.
1 switch combo.

the sequence of events
HL switch on,
this ground the Low pin on the mutiplex control box in fuse box.
this box sends 2 ground signals to both relays.
so if one headlight works you know the mpx box works
both relays close
and 12v is sent to both low beams , and there other side is grounded full time so they glow.
there are 2 fuse left and right. fuse #15 and 17

No. Amps Circuits Protected 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38 7.5
15
10
7.5
(15)
(20)
_
10
7.5
7.5
10
10
10
7.5
7.5
10
10
20
15
7.5
20
_
_
(20)
20
20
(20)
15
15
20
(15)
20
20
7.5
7.5
10
7.5
30 Power Window Relay
Fuel Pump
ACG
ABS/VSA
Heated Seats*
Front Fog Lights*
Not used
Rear Wiper
ODS (Occupant Detection System)
Meter
SRS
Right Headlight High Beam
Left Headlight High Beam
Small Light (Interior)
Small Light (Exterior)
Right Headlight Low Beam
Left Headlight Low Beam
Main Headlight High Beam
Small Lights MAIN
TPMS
Headlight Low Beam
Not used
Not used
Moonroof*
Door Lock
Front Left Power Window
HAC Option
Rear Accessory Socket
Accessory
Front Right Power Window
Accessory Power Socket on the Center Table*
Rear Right Power Window
Rear Left power window
ACC Radio
ACC Key lock
HAC
Daytime Running Lights
Front Wiper * If equipped

Check the bulb socket to make sure it's making good contact. Even add some dielectric grease to possibly help. Most sockets will melt and not be able to see it till you remove the bulb.

Check front and rear lights to see if the wiring is arcing to the turn signal on the left side of the car. This is the best guess as it's simply a wiring problem and nothing else, as there is too much current being forced through the turn signal when the headlights are on. Headlights draw much higher current than the intermittant turn signals and therefore pops the fuse.

Changing front, right turn signal on 2005 Buick Terraza: Open hood; when facing the front of vehicle, the right turn signal is on the passenger side (left). The headlight assembly needs to be removed to easily reach the turn signal. On my vehicle, there is a 10 mm screw on the left side. Remove it. There is L-shaped pin on the right side of the headlight assembly. Swing the pin counter-clockwise (to the left). Pull the pin straight up to remove. The headlight assembly is now loose, but there is a pin snapped in a socket on the back of the assembly that still holds the assembly. Pull the headlight assembly hard and straight to the front of the vehicle. When it snaps loose, the assembly is now held just by the rubber gasket surrounding the assembly. You need to gently work the right side of the gasket out of the grill cowling. The assembly should pull straight out. The wires are long enough to lay the headlight assembly in the engine compartment. Finally, the turn signal is now accessible. Twist the light holder counter-clockwise and pull out the light holder. Change the bulb. Do not punch your man-card for credit until you have successfully reinstalled the headlight assembly. It goes back in a little easier the second time. Once you have put the L-pin in place, the screw back, and successfully tested the lights, you can now punch your man-card.

I give the mechanical engineers and designers a D-minus instead of an F only because I was successful on the first try. No light bulb on anything commonly used by people should be this hard to figure out.

Right headlight sounds blown to me. Other problem needs to be looked at.

easy cheesy! Ive changed mine twice. The headlights are small bulbs. Make sure you get the right one (hi-beam vs low-beam). Unplug connector at back of bulb / headlamp unit, remove rubber weather seal (pops right ot). The bulb is held in with a small wire clip that is hard to get back on but can be done. Its spring loaded. Drop wire clip, turn bulb assya 1/4 turn, and it comes right out. Remove bulb from holder and replace. Reverse steps and VOILA!

replace the head light switch.