Question about 1999 Oldsmobile Alero
Hi! Alright, please try this. Open the hood and remove the positive battery connector. Let it sit for atleast 5mins. After 5mins. put the connector back again. Turn on the ignition key but don't start the engine. Let it on for 10 secs. then turn it off and remove the key. Insert the key again then turn it on for 10secs. after 10secs. start the car. Try it and see how it goes. Hope this helps and thank you for using FixYa!
Posted on Sep 05, 2010
You will require the tool to do that.
You must use a scan tool to perform the BCM theft deterrent relearn procedure whenever you replace the ignition switch lock cylinder.
Posted on Sep 04, 2010
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Posted on Jan 02, 2017
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The PCM, see important above
Important: This procedure is not available on vehicles equipped with option code (Z49).
If replacing a BCM with an GM SPO Replacement Part, perform the procedure to setup a new BCM prior to the 30-minute relearn procedure.
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The Content Theft Deterrent (CTD) System also contained in the BCM commands the instrument cluster to control the indicator only when the ignition switch is OFF. The CTD System uses the SECURITY indicator to identify system status.
It's software , a program inside the BCM ! An you can't just replace the BCM , it needs programming ! The dealer is the place to have that done ,most of the time ! If there is a SECRUITY light lit on the dash ,there is a DTC - diagnostic trouble code stored in the BCM , this code will point the service technician in the diagnostic path !
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