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Password Learn Procedure For Anti-Theft System (7.4L)

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  1. Password learn procedure must be performed if VCM, Passlock® module or sensor is replaced. A password is communicated between VCM and Passlock® module to provide engine operation. If VCM is replaced, VCM must learn password from Passlock® module.
  2. Attempt to start engine. Engine will start and then stall. After engine stalls, leave ignition switch turned to ON position for 10 minutes. After engine stalls, the SECURITY indicator light will stay on for 10 minutes and then turn off. SECURITY indicator light is located on right corner of instrument panel.
    NOTE: Ensure battery is fully charged before proceeding. Performing this procedure will cause DTC P1630 to set. It will be necessary to use scan tool to check for DTC P1630 when performing this procedure. Ensure steps are followed in correct order or procedure may need to be repeated.
  3. After SECURITY indicator light turns off, turn ignition off for 30 seconds. Attempt to start engine and then leave ignition switch turned to ON position. After engine stalls, leave ignition switch turned to ON position for 10 minutes. SECURITY indicator light will stay on for 10 minutes and then go off. After SECURITY indicator light turns off, turn ignition off for 30 seconds.
  4. Attempt to start engine. After engine stalls, leave ignition switch turned to ON position for 10 minutes. SECURITY indicator light will stay on for 10 minutes and then turn off or until DTC 1630 is set.
  5. Turn ignition switch to OFF position for 30 seconds. Turn ignition switch to ON position and wait 30 seconds. Attempt to start engine. If engine starts, password learn procedure is complete. Ensure DTC 1630 is cleared by turning ignition off for 30 seconds and then turning ignition switch to ON position again. If DTC 1630 is not cleared, perform test procedures for DTC 1630 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
    NOTE: DTC 1630 will be set as result of this procedure. DTC P1630 may be cleared from VCM by turning ignition off for 30 seconds and then turning ignition switch to ON position again.
  6. If engine does not start, ensure procedure was properly followed. If procedure was properly followed, check for any DTCs. If any DTCs exist, perform test procedures for specified DTC and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
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