Question about 2009 GMC Sierra 2500HD
Onstar is not fused, the only way to diable onstar is call the Onstar customer service number and discontinue the service, here is a link to your owners manual, u can look this up for yourself if you doubt what i am saying here. fuse diagrams start on page 5-124 check for yourself
Posted on Feb 06, 2010
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Posted on Jan 02, 2017
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The body control module (BCM) commands the horns on. The BCM commands the horns on under either of the following conditions:
When the content theft deterrent system detects a vehicle intrusion. For further information, refer to Content Theft Deterrent (CTD) Description and Operation in Theft Deterrent.
When the panic button is depressed on the remote control door lock transmitter. For further information, refer to Keyless Entry System Description and Operation in Keyless Entry.
When the OnStar?® system is used to sound the horns, if equipped. For further information, refer to OnStar Description and Operation in Cellular Communications.
When the keyless entry system is used to lock the vehicle, a horn chirp may sound to notify the driver that the vehicle has been locked. The notification feature may be enabled or disabled through personalization. For further information, refer to Keyless Entry System Description and Operation in Keyless Entry
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