Diagnostic Trouble Code (DTC) Information CEM-8FA2

Condition 

Fig 1: Identifying Horn Switch

Courtesy of VOLVO CARS OF NORTH AMERICA.

The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers that the relay for the horn is activated for more than 1 minute.

The diagnostic trouble code (DTC) can be diagnosed at key positions I and II.

Substitute Value 

• None.

Possible Source 

• Horn activated for more than 1 minute
• Short-circuit to battery voltage in the signal cable to the horn relay.

Fault symptom[s] 

• The horn sounds constantly.