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.
Scan Tool Data Definitions
- Accessory Switch
-
Input from ignition switch Accessory circuit. Used to determine power mode. Hot in ACC and ON.
- Battery Voltage
-
The scan tool displays 0.0-16.0 volts. The battery voltage input represents the system voltage measured at the BCM ignition feed input.
- Cargo Door Ajar Switch
-
Input from the cargo door showing the state of it.
- Driver/Passenger Door Ajar Sw.
-
Input from the respecting door indicating door status.
- GM Part Number
-
The module's part number.
- Ignition Unlock
-
Input to the control module from the ignition switch indicating the Ignition 0 position. Switch closed (HOT) in ignition switch positions UNLOCK, ACC, ON, and START.
- Run/Crank
-
Input to the control module from the ignition switch indicating the Ignition 1 position. Switch closed (HOT) in ignition switch positions ON and START.
- Key in Ignition
-
Input from ignition switch indicating that the ignition key is inserted into the ignition switch. HOT with key in ignition switch.
- Julian Date of Build
-
The day of the year when module was built.
- RAP Relay
-
Output indicating the state of the RAP relay. It is On for all power modes except Off Awake.
- Year Module Built
-
The year when module was built.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.