Horn
Press 
on the steering wheel pad to sound the horn.
See also:
Automatic Door Locks
The vehicle may have an automatic lock/unlock feature. This feature can be programmed
using the Driver Information Center (DIC). See Vehicle Personalization
for more information on DIC ...
Cadillac Owner Privileges™
Emergency Fuel Delivery: Delivery of enough fuel for the vehicle to get
to the nearest service station.
Lock-Out Service: Service to unlock the vehicle if you are locked out.
A remote unloc ...
Brake Fluid
The brake master cylinder reservoir is filled with DOT 3 brake fluid as
indicated on the reservoir cap.
See Engine Compartment Overview for the location of the reservoir.
There are only two ...