trimster Posted October 21, 2020 Report Share Posted October 21, 2020 Put in LEDs in the front turn/clearance lights on the Volvo. Now the dash computer throws an open circuit fault. Turn signal sound in the cab is fast, but the actual bulb flashing in normal. How's this fixed? resisters? LED compliant turn signal relay? Thanks Quote Link to post Share on other sites
Darryl&Rita Posted October 21, 2020 Report Share Posted October 21, 2020 Reprogram the LCM. Resistors can be added, but they take away the advantage of LED's. Quote Link to post Share on other sites
trimster Posted October 21, 2020 Author Report Share Posted October 21, 2020 LCM programming....user do'able? Or is this a dlr thing? Quote Link to post Share on other sites
jkoenig24 Posted October 21, 2020 Report Share Posted October 21, 2020 Some LEDs have polarity. If these LEDs are installed backwards, they won't illuminate. If they can be inserted when turned 180º, they might work. Quote Link to post Share on other sites
trimster Posted October 21, 2020 Author Report Share Posted October 21, 2020 Ya, they have polarity. So only one way. Quote Link to post Share on other sites
Darryl&Rita Posted October 21, 2020 Report Share Posted October 21, 2020 10 hours ago, trimster said: LCM programming....user do'able? Or is this a dlr thing? Lighting Control Module. Dealer or local mechanic with the software. Quote Link to post Share on other sites
trimster Posted October 21, 2020 Author Report Share Posted October 21, 2020 Ugh. Another $100+ for 5 min. labor. Quote Link to post Share on other sites
Nigel Posted October 21, 2020 Report Share Posted October 21, 2020 I don’t know about the front but my rear lights sorted themselves out on their own after a few days or so. Really they flash correctly outside so don’t be in a rush to spend money at the dealer. Nigel Quote Link to post Share on other sites
trimster Posted October 21, 2020 Author Report Share Posted October 21, 2020 Agree! Quote Link to post Share on other sites
rpsinc Posted October 21, 2020 Report Share Posted October 21, 2020 Change your flasher to an electronic type instead of the one supplied. I did the same thing on my IH 4700, and when I turned on the lights to check operation, the blinkers acter wacko. Changed the flasher and all is good. Circuit is looking for some load to operate the flasher and the LEDs dont have enough of a load. Quote Link to post Share on other sites
Lou Schneider Posted October 21, 2020 Report Share Posted October 21, 2020 (edited) By far the easiest solution is to add a resistor across each of the LED bulbs. As far as taking away the "advantage" of LED bulbs, the only thing the resistor does is draw a little bit of current when the LED light is on to clear the trouble code. Not enough to worry about unless you plan on leaving your truck unattended with the flashers on for more than a day or two. https://www.amazon.com/Zento-Deals-Pieces-Load-Resistors/dp/B01N0ZKV1R Edited October 21, 2020 by Lou Schneider Quote Link to post Share on other sites
rpsinc Posted October 21, 2020 Report Share Posted October 21, 2020 The resistor idea seems more involved than replacing the plug & play flasher. I also had replaced the taillights, backup lights, fog lights and headlight. Quote Link to post Share on other sites
Darryl&Rita Posted October 21, 2020 Report Share Posted October 21, 2020 Not sure if a flasher will do it, but it's a cheap step. Cheaper than laptop time. Quote Link to post Share on other sites
trimster Posted October 22, 2020 Author Report Share Posted October 22, 2020 So, the flasher sound in the cab is fast. The turn signals blink at a normal rate. The open circuit error happens when you turn the key to the on position. Computer is checking stuff I guess. Where's the flasher relay located? I'm guessing under the top dash panel where the fuses and such are. Quote Link to post Share on other sites
podwerkz Posted October 22, 2020 Report Share Posted October 22, 2020 (edited) Generally speaking, installing aftermarket (probably chinese) LED bulbs into fixtures originally intended for incandescent bulbs results in degraded lighting performance....not to mention the electrical problems you are having. I'd put the normal bulbs back in (use bulb grease) and move on to the next upgrade. Edited October 22, 2020 by podwerkz Quote Link to post Share on other sites
hone eagle Posted October 22, 2020 Report Share Posted October 22, 2020 I read somewhere that the LCM will 'learn' the new conditions (might of been a u tube vid) search for a 'number of starts' or just wait a bit like Nigel suggests Quote Link to post Share on other sites
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