Question about 1997 Toyota 4Runner
This winter, my 1997 4-cylinder 4-Runner's headlights would turn on by themselves while sitting in my driveway. The switch on the steering column was in the off position. The next time it happened, I disconnected the steering column switch and the headlights still stayed on. I also experienced a buzzing from my signal switch canister about the same time. The only way to stop it was to put the signal lights on either left or right, or disconnect the plug. Neither of these problems occurred when I took it to the dealer--of course!--and neither has happened in the warmer summer weather. Does the running headlight switch get its feed from the ignition switch? I checked the various connections on the ignition switch and everything seemed normal. It's unsettling to have to carry booster cables all the time in case the lights do their thing overnight or while I'm at a show or on a fishing trip. Any ideas???
Initially, the headlight relay unit would be suspect (likely). I would suspect corrosion on the terminal connector of the fuse box/relay bank (most likely) affecting the headlight. When damp/cold, the corrosion would be triggering the relays to engaged position. The steering column switch would be the least likely since as you posted headlight still on even if that switch is disconnected. the same may also hold true for the signal flasher. A good approach would be to work your way backwards from the headlight, fuse, relay, switch assembly using a DVM measuring/checking for +12V presence.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
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Posted on Jun 19, 2008
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Posted on Jan 02, 2017
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