When I insert the key, all the lights come on, but when I try to turn it over I get nothing. No click or cranking or anything. I tested the battery and it was good, and I was able to start it by bypassing the starter relay using a wire, so I replaced the relay but the problem remained. I assume the wiring that powers the relay has gone bad, but I'm not sure which wires to test or look at.
My car has 125000 miles.
My car has an automatic transmission.
In the starter circuit on your model, in addition to the "relay", there is a starter relay control in the PCM, and a totally integrated power module that has the neutral safety switch and the starter motor controller and of course the interconnecting wiring and fusing. Basically, with the wiring diagram in hand, all you have to do is trace from the battery to and through these components (they are limited in number) to pinpoint the interruption. Hopefully, what you have is a loose or broken wire as that will be the least expensive and least burdensome repair but in any event a circuit trace will quickly pinpoint whatever the issue turns out to be. If you want a fast resolution, just request a circuit trace and the responding certified mechanic will get this diagnosed and resolved, right at your location. If you have further questions or concerns, do not hesitate to re-contact YourMechanic because we want you to make the most of your repair dollars and help you to get the best possible results.
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