Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Standard Starting System
When you press the Keyless Go button (KIN Button), a request is sent to RF-Hub via the private LIN. Once the RF-Hub receives the request from the KIN it then looks for the valid key via the Passive Entry Module (PEM) antennas. If the RF-Hub detects a valid key, then the RF-Hub sets the ignition position to START/CRANK. The BCM then turns the Ignition status to START/CRANK.
Then the BCM sends a command to turn the vehicle to the "RUN/CRANK" If conditions are correct to start, the PCM turn on the high side of the relay and holds the high side until the PCM turns off the signal allowing the engine to crank.
If the BCM is still in crank and the crank hold signal is true then the BCM turns on the Low side of the relay and the engine will start cranking.
Once the engine has started the PCM deactivates the double start over ride. The BCM will then deactivate the starter either when the engine starts or the maximum time has been reach for the tip start (10 sec for Gas and 25 sec for diesel).
At the same time the engine starts the RF-Hub will put the ignition from "Crank" to "RUN" if the start type is "TIP Start" or the 2 second time expires or the engine controller indicates the vehicle is not in park or neutral
The engine can be manually shut down by the driver with speeds over 5 MPH in any gear.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.