Toyota Yaris Forums - Ultimate Yaris Enthusiast Site


Go Back   Toyota Yaris Forums - Ultimate Yaris Enthusiast Site > Technical Forums > DIY / Maintenance / Service
  The Tire Rack

Thread Tools Display Modes
Old 01-28-2011, 12:06 AM   #1
Syroyizhka's Avatar
Drives: 2007 Yaris Hatchback
Join Date: Mar 2009
Location: Cleveland, Ohio
Posts: 137
Question What is the difference between H4 and 9003 Bulb?

I just bought replacement bulbs, and before i had the 9003 bulbs at 15,000 K....but I had to keep moving them around in order to get the right alligmnent towards the road, because otherwise people would flash their brights at me...Would I have easier time installing H4 instead or are they the same exact same... if so, which way is the metal peice on the bulb supposed to face (ex. 2oclock, etc)
Syroyizhka is offline   Reply With Quote
Old 01-28-2011, 01:45 AM   #2
big lo
big lo's Avatar
Drives: 2007 VIOS
Join Date: May 2010
Location: Loiza,Puerto Rico
Posts: 1,125
This sound like a job for CT Scott
big lo is offline   Reply With Quote
Old 01-28-2011, 08:45 AM   #3
Drives: 2008 5 Speed Sedan
Join Date: Jan 2011
Location: Nova Scotia, Canada
Posts: 73
I've used both in my Yaris (9003 and H4) - when installed in my headlamp housing there are 2 small metal prongs that stick out on one of the 3 arms that make it so the bulb only seats properly in one position, if you rotated the bulb 120 degrees I don't believe it would seat properly.
maybe your bulbs are opposite and that's why it's blinding the other people??

I did a quick check on Wiki this is what I found:

Headlamps for right-traffic countries have low beams that "dip to the right", with most of their light directed downward/rightward.

The first dual-filament halogen bulb (to produce a low and a high beam with only one bulb), the H4, was released in 1971. The U.S. prohibited halogen headlamps until 1978, when halogen sealed beams were released. To this day, the H4 is still not legal for automotive use in the United States. Instead, the Americans created their own very similar standard (HB2/9003). The primary differences are that the HB2 sets more strict requirements on filament positioning, and that the HB2 are required to meet the lower maximum output standards set forth by the United States government.
Attached Images
File Type: jpg H4_Philips.JPG (23.6 KB, 100 views)
File Type: png low beam.png (23.8 KB, 100 views)
Vinceb is offline   Reply With Quote
Old 01-28-2011, 01:17 PM   #4
CTScott's Avatar
Drives: 09 5dr LB, 2x 08 3dr LB
Join Date: Oct 2008
Location: USA, CT
Posts: 12,999
Interesting. I was just looking at my OEM bulbs that I pulled when I installed my silverstars. The OEM ones are OSRAMs and say:

CTScott is offline   Reply With Quote
Old 01-30-2011, 12:34 PM   #5
RedRide's Avatar
Drives: '09 Yaris carmine red 2d HB
Join Date: Jun 2009
Location: Middletown, NY
Posts: 1,438
I got PIAA H4 bulbs and they are just fine.

Just make shure that whatever you get it is from a reputable manufacturand they will be aimed fine.
RedRide is offline   Reply With Quote

9003, ballast, bulb, installationg

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -4. The time now is 07:33 AM.

Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.