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.
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HOMESERVICE MANUALSCHEVROLET2004EXPRESS 1500 RWD V8-5.3L VIN TREPAIR AND DIAGNOSISBODY AND FRAMEBODY CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL DATA DEFINITIONS
2004 Chevrolet Express 1500 RWD V8-5.3L VIN T
Scan Tool Data Definitions
2004 Chevrolet Express 1500 RWD V8-5.3L VIN TSECTION Scan Tool Data Definitions
SCAN TOOL DATA DEFINITIONS
Battery Voltage: The scan tool displays 0.0-16.0 volts. This parameter represents the system voltage measured at the body control module (BCM) ignition feed input.
Ignition Accessory: Ignition Accessory is the input to the BCM from the ignition switch Accessory circuit. Ignition Accessory is used to determine the power mode. The scan tool displays Active when the ignition is in ACC or ON.
Ignition 0: Ignition 0 is the input to the BCM from the ignition switch Ignition 0 circuit. Ignition 0 is used to determine the power mode. The scan tool displays On when the ignition switch is in UNLOCK, ACC, ON, or START
Ignition 1: Ignition 1 is the input to the BCM from the ignition switch Ignition 1 circuit. Ignition 1 is used to determine the power mode. The scan tool displays On when the ignition switch is ON or START
Key in Ignition: Key in Ignition is the input from the ignition switch indicating that the ignition key is inserted into the ignition switch. The scan tool displays Yes when the key is in the ignition switch.
Module Part Number: Indicates the part number of the BCM.
Seed and Key Timer: Indicates the time remaining for programming functions.
Software Part Number: Indicates the part number of the software in the BCM.
Battery Voltage: The scan tool displays 0.0-16.0 volts. This parameter represents the system voltage measured at the body control module (BCM) ignition feed input.
Ignition Accessory: Ignition Accessory is the input to the BCM from the ignition switch Accessory circuit. Ignition Accessory is used to determine the power mode. The scan tool displays Active when the ignition is in ACC or ON.
Ignition 0: Ignition 0 is the input to the BCM from the ignition switch Ignition 0 circuit. Ignition 0 is used to determine the power mode. The scan tool displays On when the ignition switch is in UNLOCK, ACC, ON, or START
Ignition 1: Ignition 1 is the input to the BCM from the ignition switch Ignition 1 circuit. Ignition 1 is used to determine the power mode. The scan tool displays On when the ignition switch is ON or START
Key in Ignition: Key in Ignition is the input from the ignition switch indicating that the ignition key is inserted into the ignition switch. The scan tool displays Yes when the key is in the ignition switch.
Module Part Number: Indicates the part number of the BCM.
Seed and Key Timer: Indicates the time remaining for programming functions.
Software Part Number: Indicates the part number of the software in the BCM.
RENDER: 1.0x
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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.