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 MANAGEMENTRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULESERVICE AND REPAIRPASSWORD LEARN PROCEDUREWITHOUT TECH 2 SCAN TOOL OR TECHLINE TERMINAL
1998 Chevrolet Astro Van 2WD V6-4.3L VIN W
Without Tech 2 Scan Tool or Techline Terminal
1998 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Without Tech 2 Scan Tool or Techline Terminal
IMPORTANT: Refer to Diagnostic Tables / Diagnostic Trouble Code Tables / DTC P1631 Theft Deterrent Password Incorrect if the Passlock Learn Procedure cannot be completed successfully.
IMPORTANT: While the VCM is in the Auto Learn Procedure, maintain the battery voltage at all times. Follow the procedure exactly as indicated or the procedure will have to be repeated from the beginning.
PROCEDURE
1. Attempt to start the vehicle (the vehicle will start and stall), after the engine has stalled, leave the ignition ON for 10 minutes (the security light will remain ON for 10 minutes and then go OFF).
2. After the Security lamp turns OFF, turn the ignition OFF for 30 seconds.
3. Again, attempt to start the vehicle (the vehicle will start and stall), after the engine has stalled, leave the ignition ON for 10 minutes (the security light will remain ON for 10 minutes and then go OFF).
4. After the Security lamp turns OFF, turn the ignition OFF for 30 seconds.
5. Again, attempt to start the vehicle (the vehicle will start and stall), after the engine has stalled, leave the ignition ON for 10 minutes (the security light will remain ON for 10 minutes.
6. Turn the ignition OFF for 30 seconds.
7. Turn the ignition ON and wait 30 seconds.
8. Attempt to start the engine.
IMPORTANT: While the VCM is in the Auto Learn Procedure, maintain the battery voltage at all times. Follow the procedure exactly as indicated or the procedure will have to be repeated from the beginning.
PROCEDURE
1. Attempt to start the vehicle (the vehicle will start and stall), after the engine has stalled, leave the ignition ON for 10 minutes (the security light will remain ON for 10 minutes and then go OFF).
2. After the Security lamp turns OFF, turn the ignition OFF for 30 seconds.
3. Again, attempt to start the vehicle (the vehicle will start and stall), after the engine has stalled, leave the ignition ON for 10 minutes (the security light will remain ON for 10 minutes and then go OFF).
4. After the Security lamp turns OFF, turn the ignition OFF for 30 seconds.
5. Again, attempt to start the vehicle (the vehicle will start and stall), after the engine has stalled, leave the ignition ON for 10 minutes (the security light will remain ON for 10 minutes.
6. Turn the ignition OFF for 30 seconds.
7. Turn the ignition ON and wait 30 seconds.
8. Attempt to start the engine.
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.