GM Service Manual Online
For 1990-2009 cars only

The horn system consists of a single horn, a horn relay located in the underhood fuse block, and driver controlled horn switch in the steering wheel. The horn system is designed to provide the driver with an audible warning to signal pedestrians, other drivers, etc.

Operation

Voltage is supplied to the horn relay coil and contacts at all times through a 10 amp HORN fuse, located in the underhood fuse block. When the driver pushes the horn pad, driver air bag module, the circuit completes and energizes the horn relay coil. This causes the horn relay contact to close. When the contact closes, current travels to the horn and the horn emits an audible warning.

Components

Horn Assembly and Bracket

The horn operates over a battery input range of 9-14 volts at -25°C (-13°F) to 10-15 volts at +75°C (+167°F).

Relay Assembly

The relay assembly is rated at 35 amps.

The coil resistance is 85 ohms.