LEMON Manuals: Even more car manuals for everyone
Home >> Pontiac >> 2001 >> Aztek Base, AWD >> Repair and Diagnosis >> General Information >> Computer Relearn Procedures >> General Motors (Trucks & Vans) >> Escalade, Pickup, Sierra, SILVERADO, TAHOE, YUKON & YUKON XL >> Password Learn Procedure For Anti-Theft System (5.0L, 5.7L & 7.4L)

Password Learn Procedure For Anti-Theft System (5.0L, 5.7L & 7.4L)

  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. The SECURITY indicator light is located on upper right corner of instrument panel.
    NOTE: Ensure battery is fully charged before proceeding. Performing this procedure will cause DTC P1630 to set. 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. 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 go off. After SECURITY indicator light turns off, turn ignition off for 30 seconds.
  4. 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 P1630 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 P1630 is cleared from VCM by turning ignition off for 30 seconds and then turning ignition switch to ON position again. If DTC P1630 is not cleared from VCM, perform test procedures for DTC P1630 and repair as necessary. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
    NOTE: DTC 1630 will be set in VCM as result of this procedure. DTC P1630 may be cleared from VCM by turning ignition off for 30 seconds and then turning ignition switch turned 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.
scientia non olet · About LEMON Manuals