Headlights not coming on automatically - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Old Paint · 12-30-2014, 01:08 PM

I have a `99 S10 Blazer and the headlights stopped coming on automatically all of a sudden. I haven`t used the e-brake in years and the lights will still come on manually. Also the in-dash sensor doesn`t appear to be hurt. Just wondering what could have happened. Would this feature be fused separately?Thanks

*gmachinz* · 12-30-2014, 02:48 PM

The photoelectric diode in the dash light sensor is probably bad. It acts as a switch to turn on a relay which is wired in parallel with your manual light switch.

Old Paint · 12-31-2014, 10:42 AM

Thanks gmachinz. Whatever it was it has fixed itself for the time being. It is working right this morning.

12-30-2014, 01:08 PM	#1
Old Paint Registered User Join Date: Mar 2002 Location: Fairdale, Kentucky Posts: 46	Headlights not coming on automatically I have a `99 S10 Blazer and the headlights stopped coming on automatically all of a sudden. I haven`t used the e-brake in years and the lights will still come on manually. Also the in-dash sensor doesn`t appear to be hurt. Just wondering what could have happened. Would this feature be fused separately?Thanks

12-30-2014, 02:48 PM	#2
gmachinz Account Suspended Join Date: Jun 2011 Location: Des Moines, IA. Posts: 4,143	Re: Headlights not coming on automatically The photoelectric diode in the dash light sensor is probably bad. It acts as a switch to turn on a relay which is wired in parallel with your manual light switch.

12-31-2014, 10:42 AM	#3
Old Paint Registered User Join Date: Mar 2002 Location: Fairdale, Kentucky Posts: 46	Re: Headlights not coming on automatically Thanks gmachinz. Whatever it was it has fixed itself for the time being. It is working right this morning.



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