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 MANUALSCHEVROLET2000S10/T10 P/U 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISBODY AND FRAMEBODY CONTROL SYSTEMSBODY CONTROL MODULEDESCRIPTION AND OPERATIONSYSTEM DESCRIPTIONPASSLOCK(TM) THEFT DETERRENT
2000 Chevrolet S10/T10 P/U 2WD V6-4.3L VIN W
Passlock(TM) Theft Deterrent
2000 Chevrolet S10/T10 P/U 2WD V6-4.3L VIN WSECTION Passlock(TM) Theft Deterrent
Passlock(TM) is a vehicle theft deterrent system. This system contains an ignition key sensor called a Passlock(TM) sensor. The Passlock(TM) sensor is part of the ignition lock cylinder assembly. The BCM provides power and ground for the Passlock(TM) sensor.
When turning the ignition switch to the start position with the proper key, the Passlock(TM) sensor generates an analog voltage signal. This signal is sent through the Passlock(TM) detecting circuit. This analog voltage signal is of a specific value to the vehicle, and varies from vehicle to vehicle. When attempting to start the engine, the BCM compares a preset stored analog voltage value with the signal coming from the sensor. Because both values match, the BCM sends a fuel enable password via the Class 2 serial data link to the Powertrain Control Module (PCM) or the Vehicle Control Module (VCM), depending on your powertrain option. As a result, the PCM/VCM allows fuel delivery to the engine.
When attempting to start the engine without the proper key in the ignition switch, the Passlock(TM) sensor sends an analog voltage signal of a different value. The BCM compares the preset stored analog voltage value with the signal coming from the sensor. Because both values do not match, the BCM sends a fuel disable password via the Class 2 serial data link to the PCM/VCM. As a result, the PCM/VCM disables the fuel delivery to the engine and the vehicle will not start.
When turning the ignition switch to the start position with the proper key, the Passlock(TM) sensor generates an analog voltage signal. This signal is sent through the Passlock(TM) detecting circuit. This analog voltage signal is of a specific value to the vehicle, and varies from vehicle to vehicle. When attempting to start the engine, the BCM compares a preset stored analog voltage value with the signal coming from the sensor. Because both values match, the BCM sends a fuel enable password via the Class 2 serial data link to the Powertrain Control Module (PCM) or the Vehicle Control Module (VCM), depending on your powertrain option. As a result, the PCM/VCM allows fuel delivery to the engine.
When attempting to start the engine without the proper key in the ignition switch, the Passlock(TM) sensor sends an analog voltage signal of a different value. The BCM compares the preset stored analog voltage value with the signal coming from the sensor. Because both values do not match, the BCM sends a fuel disable password via the Class 2 serial data link to the PCM/VCM. As a result, the PCM/VCM disables the fuel delivery to the engine and the vehicle will not start.
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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.