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 MANUALSCHEVROLET1999CUTAWAY 7.4 JREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSANTI-THEFT SYSTEMPROGRAMMINGPASSLOCK™ AUTO LEARNPASSLOCK™ AUTO LEARN PROCEDURE
1999 Chevrolet Cutaway 7.4 J
PASSLOCK™ Auto Learn Procedure
1999 Chevrolet Cutaway 7.4 JSECTION PASSLOCK™ Auto Learn Procedure
NOTE:
Erase the Passlock™ related diagnostic trouble codes (DTCs) that are stored in the VCM/PCM. Record any DTCs. If any DTCs exist for 4.3L, 5.0L, 5.7L, 6.5L and 7.4L engines, refer to ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK
under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION - GASOLINE - EXCEPT METRO, PRIZM & TRACKER article.
- Insure the ignition key is in the ON position.
- Insure all Passlock™ module and VCM/PCM DTCs have been cleared.
- Momentarily rotate the ignition key to the CRANK position (DO NOT start the vehicle), then release it to the RUN position (DO NOT key OFF in the process).
- Wait 10 minutes. Observe the SECURITY indicator. Refer to the following list for the appropriate responses:
- If the Passlock™ sensor was replaced the SECURITY indicator will flash for the 10 minute duration.
- If the Passlock™ module was replaced, the SECURITY indicator will flash for a few seconds and then remain ON for the remainder of the 10 minute duration.
- If the VCM/PCM was replaced with a new programmed VCM/PCM and connected to the vehicle for the first time, the vehicle will start and this procedure may not be necessary.
- If the replacement VCM/PCM was connected to any vehicle at any other time, even momentarily, the SECURITY indicator will flash for a few seconds and then remain ON for the 10 minute duration.
- The SECURITY indicator will transition from flashing to ON briefly to OFF after 10 minutes if remaining in the ignition ON position.
- Turn the ignition switch to the OFF position and wait for 10 seconds.
- Repeat steps 3-6 two more times. The new security code is ready to be communicated among the Passlock™ sensor, Passlock™ module and VCM/PCM. The new password is learned on the next ignition lock cylinder cycle from OFF to CRANK to ON (start attempt).
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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.