trimster Report post Posted October 21 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 Share this post Link to post Share on other sites
Darryl&Rita Report post Posted October 21 Reprogram the LCM. Resistors can be added, but they take away the advantage of LED's. Quote Share this post Link to post Share on other sites
trimster Report post Posted October 21 LCM programming....user do'able? Or is this a dlr thing? Quote Share this post Link to post Share on other sites
jkoenig24 Report post Posted October 21 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 Share this post Link to post Share on other sites
trimster Report post Posted October 21 Ya, they have polarity. So only one way. Quote Share this post Link to post Share on other sites
Darryl&Rita Report post Posted October 21 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 Share this post Link to post Share on other sites
trimster Report post Posted October 21 Ugh. Another $100+ for 5 min. labor. Quote Share this post Link to post Share on other sites
Nigel Report post Posted October 21 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 Share this post Link to post Share on other sites
trimster Report post Posted October 21 Agree! Quote Share this post Link to post Share on other sites
rpsinc Report post Posted October 21 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 Share this post Link to post Share on other sites
Lou Schneider Report post Posted October 21 (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 by Lou Schneider Quote Share this post Link to post Share on other sites
rpsinc Report post Posted October 21 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 Share this post Link to post Share on other sites
Darryl&Rita Report post Posted October 21 Not sure if a flasher will do it, but it's a cheap step. Cheaper than laptop time. Quote Share this post Link to post Share on other sites
trimster Report post Posted October 22 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 Share this post Link to post Share on other sites
podwerkz Report post Posted October 22 (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 by podwerkz Quote Share this post Link to post Share on other sites
hone eagle Report post Posted October 22 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 Share this post Link to post Share on other sites
