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 MANUALSCHEVROLET2001ASTRO VAN L AWD V6-4.3L VIN WREPAIR AND DIAGNOSISLIGHTING AND HORNSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL DATA DEFINITIONS - DATA
2001 Chevrolet Astro Van L AWD V6-4.3L VIN W
Scan Tool Data Definitions - Data
2001 Chevrolet Astro Van L AWD V6-4.3L VIN WSECTION Scan Tool Data Definitions - Data
Ambient Light: The scan tool displays Light when the ambient light sensor voltage is between 2.2-4.7 volts. The scan tool displays Dark when the ambient light sensor voltage is between 0.2-1.3 volts.
Ambient Light Sensor: The scan tool displays the output voltage of the ambient light sensor based on the intensity of light detected. As the light intensity increases, the sensor displayed voltage increases. In the Light state, a high voltage (2.2-4.7 volts) is present and the DRL will be ON. In the Dark state, a low voltage (0.2-1.3 volts) is present and the headlamps will be ON.
Battery Voltage: The scan tool displays the battery system voltage.
Courtesy Lamp Timer: The scan tool displays the seconds left before the BCM turns the courtesy lamp relay OFF. The BCM uses this feature to control the components attached to the illuminated entry, the remote illuminated entry and the exit lighting circuits.
Dimming Potentiometer: The scan tool displays the voltage value indicating the position of the dome lamp switch, or thumbwheel. The scan tool displays approximately 0 volts when the headlamp switch is in the AUTO position and the daytime running lamps (DRL) are ON or the IP dimmer is in the FULL DIM position with the park lamps ON. The scan tool displays approximately 11 volts when either the park lamps or the headlamps are turned ON and the dome lamp switch is in the FULL BRIGHT position.
High Beam Input: The scan tool displays the voltage in order to determine the state of the high beam headlamps. The scan tool displays approximately 11.2 volts with the low beams ON and approximately 0.8 volts with the high beams ON.
Inadvertent Power Timer: The scan tool displays the seconds left before the BCM turns the inadvertent power relay OFF. The BCM uses this feature to protect the battery against inadvertent battery rundown caused by components that are part of the courtesy lamp circuit. The inadvertent power relay is supplied power by the BCM for 1216 seconds, or approximately 20 minutes, after the ignition is turned OFF.
Ambient Light Sensor: The scan tool displays the output voltage of the ambient light sensor based on the intensity of light detected. As the light intensity increases, the sensor displayed voltage increases. In the Light state, a high voltage (2.2-4.7 volts) is present and the DRL will be ON. In the Dark state, a low voltage (0.2-1.3 volts) is present and the headlamps will be ON.
Battery Voltage: The scan tool displays the battery system voltage.
Courtesy Lamp Timer: The scan tool displays the seconds left before the BCM turns the courtesy lamp relay OFF. The BCM uses this feature to control the components attached to the illuminated entry, the remote illuminated entry and the exit lighting circuits.
Dimming Potentiometer: The scan tool displays the voltage value indicating the position of the dome lamp switch, or thumbwheel. The scan tool displays approximately 0 volts when the headlamp switch is in the AUTO position and the daytime running lamps (DRL) are ON or the IP dimmer is in the FULL DIM position with the park lamps ON. The scan tool displays approximately 11 volts when either the park lamps or the headlamps are turned ON and the dome lamp switch is in the FULL BRIGHT position.
High Beam Input: The scan tool displays the voltage in order to determine the state of the high beam headlamps. The scan tool displays approximately 11.2 volts with the low beams ON and approximately 0.8 volts with the high beams ON.
Inadvertent Power Timer: The scan tool displays the seconds left before the BCM turns the inadvertent power relay OFF. The BCM uses this feature to protect the battery against inadvertent battery rundown caused by components that are part of the courtesy lamp circuit. The inadvertent power relay is supplied power by the BCM for 1216 seconds, or approximately 20 minutes, after the ignition is turned OFF.
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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.