Toyota 4Runner owners have reported 2 problems related to trunk wiring (under the electrical system category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Toyota 4Runner based on all problems reported for the 4Runner.
Vehicle was parked on shoulder of road, engine running, whilst adjusting the mobile gps (hence the reason for stopping). At first smoke was coming up around/through center console (between driver's seat and passenger front seat) and then flames. The interior of passenger compartment was totally burned out in spite of prompt response by emergency crew. State farm insurance has naturally been notified although I hardly see why state farm should pay and not Toyota. Surely there must have been something wrong with electrical wiring.
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Mice have infiltrated the headliner area of 2007 Toyota 4 runner. They built a nest and chewed the wiring insulation for the sunroof switch which caused a short that melted the wires and caused the sunroof to malfunction. Dealership replaced the switch and repaired the wires for $360 since this was not covered under warranty. After exploring the internet other people are experiencing the same problems on Honda and several other models. Some of the conversations referred to the wiring insulation being made out of soy based material. Is there any idea why/how are they past the engine compartment and into the headliners and cabins? could there be a design flaw? from reading the posts a strong possibility exists for accidents to be caused because mice are running across people's feet, etc. While they are driving. Health concerns have also been raised due to odors and feces by the mice, some of these infiltration sound pretty bad all of which cannot be attributed solely to the owners. There's not much that can be done to keep them out or so it seems.