PASSLOCK(tm) SYSTEM AUTO LEARN

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2000 GMC Yukon XL, 2000 GMC Yukon, 2000 GMC Sierra, 2000 Chevrolet Tahoe, and 2000 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: This procedure allows relearning of Passlock(tm) module or PCM/VCM learned data code after replacement of Passlock(tm) module, Passlock(tm) sensor or PCM/VCM. DTC B3031 will set when entering programming mode.

Clear all DTCs. Turn ignition off. Replace component(s) as necessary.
With transmission in Park (A/T) or Neutral (M/T), momentarily turn ignition switch to START position (engine will not start). Leave ignition switch in RUN position (engine off). If Passlock(tm) sensor was replaced, SECURITY indicator light will flash for 10 minutes. If Passlock(tm) module was replaced, SECURITY indicator light will flash for a few seconds, and then remain on for 10 minutes. If PCM/VCM was replaced with a new PCM/VCM, vehicle may start and procedure may not be needed. If replacement PCM/VCM was used even momentarily, SECURITY indicator light will flash for a few seconds, and then remain on for 10 minutes. After 10 minutes, when light turns off, turn ignition switch to OFF position for 5 seconds.
Repeat step 2 twice more. Ignition switch must be turned to OFF position. Auto learn procedure will be completed during next start attempt. Clear all DTCs. If PCM/VCM was replaced, reprogram PCM/VCM. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.