Question about 1998 Chevrolet Tahoe
Well, this is how it's supposed to work but I have had to resort to using a GM specific scan tool when I couldn't get it to relearn.
1. With vehicle in Park, turn the key to the crank position briefly [do not start engine but just bump the starter so the engine turns over about 1/2 a turn] then release the key and let it remain in the "run" position. The security light should flash for a few seconds then stay on for about 10 minutes.
2. At the end of about 10 minutes, the security lights should go off so watch closely. Once it goes off turn the ignition key "off" for about 10 seconds then repeat step 1 two more times which should add up to about 30 minutes total of time spent.
3. After you have finished the 3rd of the 10 minute cycles, leave the key off for about 20 seconds then try and start the engine. If it starts...you should be ready to go. If not, then you may need to have someone with a scan tool help you out. Like I say, it SHOULD work but I have found some aftermarket key cylinders that I just can't get to relearn so you may need an OEM cylinder [I would suggest it actually]
Good luck, hope this helps you out.
Posted on Aug 03, 2010
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Posted on Jan 02, 2017
Tips for a great answer:
Instrument Panel Cluster (IPC)
Powertrain control module (PCM)
The above modules, with the exception for the Passlock?"¢ Sensor must also be programmed with each module's own vehicle configuration. See the individual module service manual section.
Time required, approximately 10 minutes.
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The ignition switch
The passlock sensor
The EVO/Passlock module
The security indicator
The vehicle/powertrain control module (VCM/PCM)
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