They are behind the headlamps. There is also a bulletin regarding the discontinuation of a dual note horn and utilizing a single one. That info is as follows.
#PIT5017: Horn Missing or Sound Weak - (Jun 30, 2010)
Horn Missing or Sounds Weak
2003-2004 Buick Rendezvous
2003-2004 Chevrolet Venture
2003-2004 Oldsmobile Silhouette
2003-2004 Pontiac Montana and Aztek
This PI was superseded to assign a new PI number due to a conflict with existing PI. Please discard PI0088B.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Horn is missing or sounds weak.
A production change was made early in the 2003 model year, eliminating the right hand (high-note) horn and wiring used in previous years. A single note horn is now used on models listed above. Do not install a second horn and wiring.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
Tuesday, June 21st, 2011 AT 8:13 PM