Turn off your engine and disconnect the battery cables again, leaving them disconnected this time.It will give it enough time to complete whatever task is necessary for entering fail-safe mode. Start the car by connecting the battery cables in reverse order of what you did before, and leave it running for 15-20 seconds.If the multimeter reads anything lower than 11 volts, then your vehicle should now be ready to be put into fail-safe mode. Now put your transmission selector into P (Park if you’re using an automatic) or N (Neutral if you’re using a manual). Connect your multimeter to this wire and ground it.The “signal” wire controls whether or not your vehicle enters fail-safe mode when placed into Park or Neutral from any other selector position. Locate a gray wire with a black/white stripe on the TCM harness connector (or whatever color combination your car uses).In others, it will be under the passenger seat or on the driver’s side front edge of the engine compartment. In some vehicles, it may be behind the glove box. Pull out or unplug the car’s transmission control module.Remove the car’s positive (red) cable from the battery, then disconnect it at the starter solenoid if that was not where you disconnected it before.You must do it to avoid an electrical shock while working near the car’s computer later on if your hands should slip.
The first thing you have to do is disconnect the negative/ground cable from the battery.Consult the documentation for your specific vehicle if necessary. Of course, every car is different so this process might vary slightly from one to another. It is especially useful for re-setting the “ adaptive memory” in some transmissions, which you can’t do while driving because certain things must be done while coasting up to speed in neutral. Not everyone knows this, but there is a way to reset your transmission control module (TCM) without having to go into the car’s computer. 8 Final Considerations How Do You Reset A Transmission Control Module?
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