Checking the wiring for the horn

Check the relay (2/17).

HINT: The voltage must be 12 V at terminal #3. The signal to the horn is at terminal #5. 

Check the cable between relay terminal #5 and horn 1 (16/10) terminal #1 and horn 2 (16/11) terminal #1.

Also check that both the horns are grounded at terminal #2.

Check the connector.

Remedy as necessary.

Fig 1: Identifying Connector Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Relays And Relay Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  OKAY:  Troubleshooting has been completed.