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.
Input Displays: Notes
When trouble shooting a malfunction, the ECM or IPC input display can be used to determine if the switched inputs are properly interpreted. When one of the input tests is selected, the state of that device is displayed as "HI" or "LO". Basically, "HI" or "LO" represent the input terminal voltage for that circuit.
The display also indicates if the input changed state (activated or deactivated) since it was last tested. If a change occurred, an "X" will appear next to the "HI"/"LO" indicator. If a change did not occur, an "O" will remain displayed. The "X" will only appear once per selected input.
Input display may show Instrument Panel Cluster (IPC) trouble codes. IPC input codes are prefixed with an "II" (Instrument Input). The following is a brief summary of each ECM, BCM and IPC input.
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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.
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