WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Installing Horn Relay
Courtesy of GENERAL MOTORS CORP.
Use the J 43244
in order to install the horn relay (1) to the underhood fuse block.
Install the protective covers to the underhood fuse block.