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June 2002
2003 New Model Update
(912)
Legacy
The Keyless Entry control module receives a Door unlock and Door lock signal from the VIU. Each
command uses its own wire. The control of the security system and the keyless entry system are
usually commanded together although independent control is possible.
The driver of the vehicle can call OnStar from a separate phone and request that the vehicle be
locked, unlocked or security system turned on or off.
The Horn relay receives a signal from the VIU that will supply a ground to the coil of the relay to
beep the horn. This is performed if the driver calls OnStar from a separate phone to assist with
locating the vehicle.
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