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 MANUALSCHEVROLET1998ASTRO VAN 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULESERVICE AND REPAIRPASSWORD LEARN PROCEDUREUSING A T50/T60/T20+
1998 Chevrolet Astro Van 2WD V6-4.3L VIN W
Using A T50/T60/T20+
1998 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Using A T50/T60/T20+
IMPORTANT: Refer to Diagnostic Tables / Diagnostic Trouble Code Tables / DTC P1631 Theft Deterrent Password Incorrect if the Passlock Learn Procedure cannot be completed successfully.
PROCEDURE
1. Using the T50/T60/T20+, enter the Service Programming System (SPS).
2. Select Terminal to Vehicle Programming.
3. Select Done and follow the instructions on the Vehicle Set-up screen
4. Select Vehicle Theft Re-learn.
5. Follow the instructions on the remaining screens.
^ The VCM and the Passlock control module will prepare for a re-learn.
^ A security timer will be ON for approximately 10 minutes.
^ When the VCM and the Passlock control module are prepared to re-learn, turn the ignition OFF for 30 seconds and then start the engine.
PROCEDURE
1. Using the T50/T60/T20+, enter the Service Programming System (SPS).
2. Select Terminal to Vehicle Programming.
3. Select Done and follow the instructions on the Vehicle Set-up screen
4. Select Vehicle Theft Re-learn.
5. Follow the instructions on the remaining screens.
^ The VCM and the Passlock control module will prepare for a re-learn.
^ A security timer will be ON for approximately 10 minutes.
^ When the VCM and the Passlock control module are prepared to re-learn, turn the ignition OFF for 30 seconds and then start the engine.
RENDER: 1.0x
NO RELATED
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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.