HDM failed..............again

mark'stb

Well-Known Member
This seems to be a yearly thing for the last 4 years. Left dinner to go home and no low beam headlights, again. This is why I keep a spare hdm in the console. Is there a root cause for it to keep failing? Pricey little buggers they are.
 

Mounce

Well-Known Member
What brand? This is usually an oem only part as the aftermarkets exhibit these actions or worse... Meltdown.

Mine failed once but the acdelco replacement is still going years later.
 
OP
OP
mark'stb

mark'stb

Well-Known Member
GM. I'm tempted to open it up and make a jumper from terminal 2 to 4 and see what happens.
 

Matt

Silver Supporter
You may need to bite the bullet and pay the $120 for the updated one.
 

budwich

Well-Known Member
without looking at the schematic, it is likely all you would lose is the "reduced daytime running" light level...my guess which may or may not be a problem in terms of headlight longevity.

and now looking at the operation... the other "big problem" would be when and if you use your brights, both hi and low would be on at the same time since the HDM was "hot wired" to always be on.

Of course, the bigger problem would likely be that fact that the "hot wiring" would leave you with the headlight always ON... tough on batteries... :smile:
 
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Mooseman

Moderator
Maybe check out the u-pull yards. For some reason, the earlier years didn't exhibit this problem. Grab a pocketful of spares while you're there :biggrin:
 

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