Hello. Went to check the bulb size on my blinkers, placed the bulb back, then stopped working later in the day. Switch the bulbs from one side to the other, now both sides not working. I am getting a rapid flashing inside the car and the Hazard still works, and the rear blinker bulbs work, but nothing from the front blinker bulbs. I can't for the life of me find any information online to confirm which fuses I am checking for these for the 2015 IS250. I did nothing but check the bulb and put it back, now I have nothing.

Can someone please help with what I should be checking to diagnose this? The bulbs both look fine, they were working fine before I checked, and I've gone through a bunch of the fuses, but again I can't confirm which fuses and where. Please help!

 

I know it sounds silly, but did you insert them all the way when you reinstalled them? From what I understood is that they were both working until you removed the bulbs.

 

I have checked that multiple times, snaps in place just fine. No light!

Does anyone know which fuses from these pics are for the front turn signals? I've scoured the entire web and I can only find IS250 diagrams to 2013. I've found some information from the 2014 (which should be the same layout as 2015) but no luck.

 

I looked at a couple wiring diagrams and it does not seem that there is a dedicated fuse for turn signals. They all seem to get their power from the Combination Meter Assembly. In fact, all the right turn signals (front/rear/side mirror) share the same power source (similarly for the left).

 

Thanks for checking! Do you by chance know which of the fuse(s) specifically is for those functions? I want to double check those ones.

Still not working and I checked fuses again yesterday. I'm gonna try new bulbs to eliminate that chance.

The only other thing I can think of is perhaps the LED interior dome/map lights are interfering? I can't see how this would cause an issue. I changed all my interior bulbs to LED and those all work just fine. I'm still using the factory halogen blinker bulbs and have no intention to change those for LEDs.

I guess if new bulbs don't work I'll just have to have Lexus check at next oil change. Very strange.

 

The following fuses are under the driver-side dashboard (inside the car):
- 7.5 A METER
- 10 A MPX-B NO.1
- 15 A HAZ
The interior lights shouldn't have anything to do with it. I'm just confused on why it's only the fronts that are not working, and only after you re-installed them. Do the bulbs look like they're blown? Do you have access to a multimeter to check if power is making it to the bulb connector?

 

But the front wing fender ones and the rear ones are working. Only the front ones are not working. I hear the click on the relay. I checked all the fuzes on the engine fuse box and the one under the steering wheel. It's all good.

Is there any other fuse box in the car? Or is the front circuit separate from the rear and wing turn lights?

I was thinking, is this possible if one turn light fail, will all the other on the headlight stop working?

Anyway, my next step is to swap the four turn signals in the headlights to LEDs. Before checking the relay(I already bought the relay, I am waiting it to arrive, I will install it at the same day as I will install the new bulbs , just in case)... If no joy, then the next step is the relay. If no joy again, then I must take to a mechanic... 🙈

​​​​​I am asking just in case someone had the same problem and was able to fix...