Horn Relay Inspection

Disconnect negative (-) cable at battery.
Remove junction block.
Remove horn relay (1) from junction block (2).

Fig 1: Removing Horn Relay From Junction Block
Courtesy of SUZUKI OF AMERICA CORP.
Check that there is no continuity between terminals "c" and "d". If there is continuity, replace relay.
Check that there is continuity between terminals "c" and "d" when a 12 V battery is connected to terminals "a" and "b". If malfunction is found, replace it with a new one.

Fig 2: Checking Horn Relay Continuity
Courtesy of SUZUKI OF AMERICA CORP.