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1999 Jimmy comaand start issue?

Tiny
RICKI1981
  • MEMBER
  • 1999 GMC JIMMY
I changed the battery in command start key chain on 1999 Jimmy and now the vehicle wont start at all. But it turns over like it wants to. The security light is constantly flashing now as well, and before it would flash twice stop flash twice, etc
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Tuesday, May 10th, 2011 AT 5:07 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You need to do a relearn for the Passlock system. The short version should work for that. Here it is.

PASSLOCK 10 MINUTE RELEARN

AUTO LEARN
Time required, approximately 10 minutes:

1. Insure that the battery is fully charged.
2. Use the scan tool in order to clear the DTCs.
3. Turn the ignition switch from the OFF position to the CRANK position attempting to start the vehicle. The vehicle will start and then stall.
4. Leave the ignition switch in the ON position while observing the security indicator.
5. When the security indicator turns off, which can take up to 10 minutes, turn the ignition switch off. Wait 10 seconds.
6. The BCM and the PCM will learn the new code on the next start attempt.
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Tuesday, May 10th, 2011 AT 6:37 PM

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