Question about 1999 GMC Jimmy
I have a 1999 GMC Jimmy which has the security light come on solid causing no starts on the vehicle often. Please advise what could be the issue and what is the proper fix. Also, trying to figure out what the white electical component is that sits on the steering column behind the ignition lock cylinder ( mine has electical tape wrapped up around it).
Without the proper testing equipment an knowledge ( factory service info. ) You have no idea what's up . an don't have a chance of fixing this . Checking for DTC'S - diagnostic trouble codes is always the first step . Take's a professional type scan tool to read these codes. Serial data info from module incharge to PCM/ECM ,enable or disable fuel and or starter operation . Sends coded messages Your best bet , take it to a qualified repair shop . That white component is the ignition switch .
The design of the passlock™ system is to prevent the vehicle operation if the proper ignition key is not used in order to start the vehicle. The mechanical key, in normal operation, will turn the passlock™ lock cylinder. The passlock™ sensor will relay the passlock™ data to the body control module (BCM). The BCM will determine the validity of the passlock™ data. The BCM will send a code password to the vehicle/powertrain control module (VCM/PCM). When the VCM/PCM receives the correct code the VCM/PCM allows the fuel injectors to operate normally. The passlock™ system requires the VCM/PCM and the BCM to communicate the various functions in order to operate. These functions transmit over the class 2 serial data line CKT 1807. For an explanation of the class 2 serial data operation refer to Data Link Communications Circuit Description in Wiring Systems
Posted on Oct 07, 2017
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Posted on Jan 02, 2017
I experienced this problem, intermittant failure to start. This procedure must be done with the truck RUNNING.
Remove the cover off of your ignition switch. On the top there is a small wire connector that, once the truck is running, should be disconnected. This will turn on the 'SECURITY' light. All will be better, except the security light will be on at all times, much cheaper than replacing the ignition switch, however.
Posted on May 10, 2009
Hi: From my experience the security issue is easily solved because hitting the factory key FOB lock button is the only way to activate it, hitting door lock button will not activate it. When installing a remote starter no wires are cut usually, just spliced into which means... make sure that where wires were spliced they are taped. If you have the original factory key FOB use a quarter and pop apart, replace the battery, key FOB should have retained its factory setting if your lucky, if doesn't work go to internet search and find programming procedure. Hope this helps... please rate suggestion...ty
Posted on May 21, 2009
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