How do you replace a low-beam headlight on the 2005 Buick Rainier? I do not even understand how to remove the front grille?

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Possible the headlight/dimmer switch is bad. Should be part of the turn signal switch assembly. Try moving the switch back and forth many times to see if the connection is bad.

Look for the little plastic star drive adjusters to adjust up and down. I use a very small SAE deep well socket to adjust mine 7/32" if I recall correctly. Look near the rear of the headlight assembly. That's where Trailblazers are (Same platform as Rainier), but I know the heads lights differ just a tad.

RELAY RELAY RELAY. Known issue for years, there is a recall for this issue. Quick fix is to swap #43 with #46 relay or replace your own relay. I keep a spare in my glovebox. GM has just released a permanent fix for this problem, like a month ago.

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The problem with the headlights is a common one and it is in the low beam relay.; In the under hood fuse panel, locate the HDM relay, swap this relay with the FAN relay next to it. If the lights stay on, replace the relay. This is a solid state relay, so make sure to get the same part number.

If it has a headlight relay,it is probably bad(There's a possibility of a bad ground which is common to both headlights). If not that,it must be the multi-switch that has the turn-signal/headlight/dimming control on it.don-ohio (:^)

If it is just burnt out , you do not have to remove or replace the whole lamp , just the small bulb inside of it. They are usually easily accessable from inside the engine compartment , and just come out of the back of the headlight by 1/4 turn.

For agrivation go to walmart and have an oil change and ask them to change the headlight bulbs, they do NOT CHARGE EXTRA labor charges.

Otherwise, gently apply pulling pressure on the front grill every few inches to get the grill unhooked on the top and bottom nearest the headlight assembly. Then have someone hold the grill assembly out while you pull out the headlight assembly to access the rear of it to remove the hold down nut to remove the bulb's. Reverse removal procedure, which is actually harder to put the headlight assembly back into place then it is to remove.

Switch relay #45 with relay #46 next time your low beams go out, do you have lights again? If so, get a new relay.

I just changed the low beam bulb in a '05 Buick LaCrosse and found it really rather easy after researching it. I found no reason to remove the grill and the bumper cover, BUT you do have to remove the top 4 fastners that hold the grill assy to the radiator support, then you can work the headlight assy forward enough to work it out of the socket and turn it down so you can get to the bulb pockets on the back side. NO NEED to remove it all, just loosen it and gentley pry things forward enough to get the light assy out. ALSO> My supplier said his Wagner lighting book called for a 9006 bulb, but the car I worked took a H11. About 4x the money over a plain ol 9006 bulb but it might save someone picking up the wrong bulb. I hope this helps someone else out....Best of luck to you all

No, please watch the video. Headlight Change 2005 2007 Buick Terraza 2005 Buick Terraza CX 3 5L V6