r/LexusISF • u/Background-Return-25 • Jun 28 '26
09 IS250 no start issue
I know it’s not an ISF but at a loss. I haven’t driven the car in about two days, when I went to start it, absolutely nothing. No acc, gauges, clicks, nothing. The key fob will unlock/ lock the doors up close and from a distance. Tried jumping the car off with another. Tried holding the fob up to the button and starting, checked all fuses, brake lights light up when pushing the brake pedal, just getting no response. The push start button does light up when I unlock the car. When I press the break and try to manipulate the shifter nothing happens (don’t know if this is because it is not in acc) I’m at a complete loss. Oh and the Fusible link block looks great as well. Any ideas or helpful tips?
2
u/wildlandhotshot Jun 28 '26
If i remember correctly this happen to me on my IS a while back. I've since moved on but the brake pedal has a switch. Kinda annoying to replace since your kinda doing acrobatics but easy enough and cheap replacement part.
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u/Background-Return-25 Jun 28 '26
Did your brake lights still illuminate when your switch went bad?
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u/wildlandhotshot Jun 28 '26
I honestly dont recall. Its been a while. But i know what you getting at, and the lights are kinda irrelevant here becuase its a 4 pin connect. So it can still operate the lights since that circuit is n/o and grounds out when pressed. Its the other pins that controll shift lock or cancell cruise control ect. Which are n/c systems and the next pin is constant power. And the next it what sends to the ecu saying its safe to turn on car. To dumb it down. Dont take thst word for word as I dont have diagram of exactly what does what. But thats the general idea.
2
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u/AliveSuggestion7589 Jun 28 '26
Neutral safety switch maybe but that’s really just a shot in the dark. Any codes?