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low beam problems


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tosbourne88
Novice

Mar 1, 2014, 10:51 PM

Post #1 of 8 (1678 views)
low beam problems Sign In

Hello everyone...hoping someone can give me some possible solutions to look for inmy car. Ihave a 2008 mazda3 gs. Yesterday my two low beams stopped working in auto and manual. Both bulbs are only about a year old. Any ideas?


Discretesignals
Ultimate Carjunky / Moderator
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Mar 1, 2014, 11:35 PM

Post #2 of 8 (1663 views)
Re: low beam problems Sign In

Have you inspected the bulbs to see if they are blown? Do you have a volt meter or 12 volt test lamp and know how to use them?





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


tosbourne88
Novice

Mar 2, 2014, 12:27 AM

Post #3 of 8 (1656 views)
Re: low beam problems Sign In

Yep...should have said that in my post..my bad..bulbs are fine.


Tom Greenleaf
Ultimate Carjunky / Moderator
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Mar 2, 2014, 5:41 AM

Post #4 of 8 (1648 views)
Re: low beam problems Sign In

I'm sure DS will be back later for more ideas. You think bulbs are good and probably right but hard to know for certain by looks alone. Duh - both at same time if noticed would suggest not.


Cheap basic test light:

It's really all you need for the moment to track down problem some more. Clip to ground then when point touches 12v + it will light the handle. To use backwards clip to Bat Neg. anything and handle will light with point touching power.


Now test if possible the back side of the plug to the lights when they should be on looking for power for high beam request and low beam request. Another should be a constant ground for both. Maybe not but should be when lights should be on.


Back probing for test not exact picture just basic idea:



You can use a "T" pin if that gets there better. Always be careful not to ground out anything you touch that could be empowered.


This much for a start will show if the bulbs are getting power and ground to at least know that much,


T



Hammer Time
Ultimate Carjunky / Moderator
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Mar 2, 2014, 6:41 AM

Post #5 of 8 (1644 views)
Re: low beam problems Sign In


Quote
To use backwards clip to Bat Neg. anything and handle will light with point touching power.



I think what Tom intended to say here is if you want to test for ground, clip the lead to the positive side of the battery and the light will light when you touch ground so you can test the ground side of the circuit.


Although this tool will work without a problem in this particular vehicle for this particular circuit, this is not a tool that you want to make a habit of using on today's electrical circuits. Many of these circuits are now controlled by modules and the current drawn by this light can be enough to burn out the module. Computer safe tests lights these days use LED bulbs instead of incandescent bulbs.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
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Mar 2, 2014, 6:55 AM

Post #6 of 8 (1640 views)
Re: low beam problems Sign In

Correct HT - thanks. OP - an LED test light of that style is still under $10 and decent. LED is infinitely LESS likely to cause any problems with sensitive circuits to be avoided anyway unless you are certain of what you are doing in any testing for other things.


Like many things "When in doubt, don't" is a good rule of thumb, Tom



kev2
Veteran
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Mar 2, 2014, 8:50 AM

Post #7 of 8 (1630 views)
Re: low beam problems Sign In

 

if high beams OK? then ck low Beamm relay - maybe swap with Hi to test...

next we would need to know Is this a halogen or discharge system ?


Tom Greenleaf
Ultimate Carjunky / Moderator
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Mar 2, 2014, 9:16 AM

Post #8 of 8 (1625 views)
Re: low beam problems Sign In

My question on this as there are no standard light bulbs of any sort listed for sale? Does list pig-tails to splice in.


What is this set up? OP said bulbs so rolled with that? Tom


(edit to add what showed, [No parts found for headlight bulb.] Then shows a part # if you bought the whole lens assembly for a bulb, WTF? #BN8P-51-0L0C.)

(This post was edited by Tom Greenleaf on Mar 2, 2014, 9:24 AM)






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