Service Information

Volt

Symptoms - Horns

Important: The following steps must be completed before using the symptom tables:

Perform Diagnostic System Check - Vehicle , before using the symptom tables in order to verify that all of the following are true:

•	There are no DTCs set

•	The control modules can communicate via the serial data link

Review the system operation in order to familiarise yourself with the system functions. Refer to Horns System Description and Operation .

•	Inspect for aftermarket devices which could affect the operation of the horn system. Refer to Checking Aftermarket Accessories .

•	Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

•	Perform the following if a horn buzzes or has a harsh tone.

-	Inspect for debris in the joint where the horn fastens to the vehicle.

-	Test the torque of the horn mounting hardware. The horn mounting hardware should be tightened to a torque of 10 N·m (7 lb ft).

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections .

Refer to a symptom diagnostic procedure Horns Malfunction in order to diagnose the symptom.