jsjax
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Hey, long time reader, first time poster here. Thanks for all the helpful advice so far! Apologies if this is answered somewhere else, there seem to be a lot of similar cases, but I couldn't find exactly my situation.
I've got a '04 RX330 with the brake lights, VSC, tire pressure, etc... on the dash. I went ahead and replaced the brake light switch and the lights went away for about a day, and then they came back. I then replaced it again with a different switch, and again, the lights went away for a day and came back. (I tried both the bigger blue switch and the smaller white switch)
Both times, I pulled a P0504 code over OBD2 and I cleared it both times. Both times that code came back.
Other diagnostics:
- I tested both switches with my multimeter, they both seem fine
- I measured 12V, (well, 11.7V) across the plug when the key is in the ON position.
- I've also tested all my fuses in the box underneath the steering wheel.
- The car operates totally fine, it runs.
- The brake lights turn on as expected (all bulbs are working).
Does anyone have any ideas of what else it could be, or what I may need to replace?
Thanks in advance!
P0504 after replacing brake switch, what to test next?
in 04 - 09 Lexus RX330 / RX350 / RX400h
Posted
Okay, that sounds like a good idea.
I assume that there is some ECU that is reading the switch position, and the fault could be inside that component. Do you happen to know what/where that component is?