Reply With Quotewithiut sounding like a wize a$$ did you check the fuse. Under the hood
1996 Suburban: Daytime headlights just stopped working. These are the ones that run slightly dimmer in daytime vs standard nighttime headlight use.
1. Is there an easy common fix for this problem, a relay or module that commonly fails?
2. Are there easy tests with a multimeter to determine wherein lies the problem?
Regular headlights with the switch work fine. Any help appreciated.
withiut sounding like a wize a$$ did you check the fuse. Under the hood
rex, there's a diode near the bottom center of your dash. it looks like a black amplifier heat sink with a 2 wire connector goin into it. unplug that connector and jump a paper clip across it, then check your drl's. if they come on, you need to replace that diodeif the the paper clip test doesn't fix them, reconnect the diode, and look over towards the em brake racthet. there's a drl relay on that junction block on the fire wall. pull the relay out, look where 30 & 87 are on the relay, then use a paper clip across the corresponding terminals on the junction block(or just try another relay).
give me a call(580-326-8335 ask for tom) or pm tommorrow and i can send you the schematics.
ps, while doin the diode paper clip test , if the diode is the culprit, the paper clip will get reallly hot.becareful when removing it from the connector, it'll burn the shiat outta ya
I always just made sure the brights worked, then checked that the green DRL light on the dash was on. If all was good, new diode. Pretty rare that it was ever anything else. One time both high beam bulbs were burnt out.
When you get the diode Mike, remove it from the bracket it comes with and do the same with the one under the dash. Way easier than fiddling with that bolt that holds the bracket in place under the dash.
rex, there's a diode near the bottom center of your dash. it looks like a black amplifier heat sink with a 2 wire connector goin into it. unplug that connector and jump a paper clip across it, then check your drl's. if they come on, you need to replace that diode
give me a call(580-326-8335 ask for tom) or pm tommorrow and i can send you the schematics.
Ditto, good call Tom. DRL diodes were very prone to failure in that generation truck. We've changed hundreds of them over the years for DRL inop.
I always just made sure the brights worked, then checked that the green DRL light on the dash was on. If all was good, new diode. Pretty rare that it was ever anything else. One time both high beam bulbs were burnt out.
When you get the diode Mike, remove it from the bracket it comes with and do the same with the one under the dash. Way easier than fiddling with that bolt that holds the bracket in place under the dash.
Exactly, If you look at how the diode is mounted in its bracket, you can bend two of the tabs that hold the diode to the bracket and slide it out without having to unbolt the bracket which can be a pain in the ass. Just slide the new one in and rebend the tabs to where they were.
Jay
Yes I've checked all light related fuses both under the hood and on the side of the dash by the door.
I will check this other stuff out tomorrow and report back. Thanks guys.
btw this model truck doesn't have a drl indicator light on the dash that I know of (unless it's been burned out since I've owned the truck)... possibly a later model addition... ?
Check the parking brake. If I remember correctly if you push the park brake down one click it will turn off the drl. just a thought.
Rio, Does that cover 1996 model or later years? I have 2 96" and haven't noticed a dash indicator light on either truck. Bought one of them new.
96 model year as I remember (which may not be well) was the first year for drl's. And they later changed the system to where the headlights did not run dimmer than under normal night use (again someone who knows more than I about this please correct me if I'm wrong).
Check the parking brake. If I remember correctly if you push the park brake down one click it will turn off the drl. just a thought.
I will definately check that, thanks
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