What is wrong with my high beam toyota 4runner 2002 lights?

I have a Toyota 4Runner 2002 3.0TurboDiesel, and I have a problem with the headlights, the low beam head light works perfect, and the high beam head light works only when I pull the head light switch towards me (for a quick change of lights), but it does not work when I push the light switch forward (for a permanent change to high beam). The dealer tells me I have to change the turn signal/head light switch in the steering wheel, but they also say I have to change some control unit integrated circuits. They don't seem to be sure what the problem is, so before buying some expensive integrated circuits, I wanted to hear some suggestions on how to troubleshoot the problem and/or confirm the dealer diagnostics.What is wrong with my high beam toyota 4runner 2002 lights?First, I am making an assumption that your diesel is wired the same as a gas one, as here in the US we don't have the diesel. But the critical question is, %26quot;Does the truck have daytime running lights?%26quot; If no, the answer is simple: you need a headlight switch, which you canNOT disassemble to repair. It is one of the new modular ones that are all fastened together and can't be fixed. However, if you DO have DRLs, the answer is MUCH more complicated because all inputs from the headlight switch go to one DRL relay (computer) and all functions are controlled from there. No doubt the dealer hedged in their answer because they know that the most likely answer is the switch, but want to leave room to cover themselves if that doesn't fix it. Unfortunately, from studying the diagram, it would be really tricky to bypass the relay to test, and you would really have to know what you were doing. If it were in my shop, I would check for continuity across the switch in high beam ( pins 7 and 16, a violet wire and a white with black tracer wire). If none were there, I would put the switch in and hope for the best. I might would even see if I could find another vehicle and borrow the relay just to be safe, but I completely understand their hesitation. I tell you, until you try to diagnose these modern cars (which is what I do every day!) you just don't understand what we are up against. In this specific case, if you follow the diagnostic tree for inoperative high beams in the diagnostic section of the Toyota Information System, it gives you location of the components and NO help on diagnosis.



Maybe you could cut the guys a break......



Hope this helps. God Bless!What is wrong with my high beam toyota 4runner 2002 lights?Most likely it is the switch in the steering column. It is easy, less time consuming and more profitable for them to order a new switch, replace it and charge you for it. BUT it is possible all the switch needs is dismantling and the contacts cleaning and put back together.



It is also time consuming for them to diagnose electrical problems and hunt about the wring looms in inconvenient places looking for inoperative circuits, hence why they told you it may be the circuits, it may be the switch. Not very helpful at all.What is wrong with my high beam toyota 4runner 2002 lights?the high beam on the switch is out you will need a new switch