Diagnostic trouble code (DTC) information

Condition 

Diagnostic trouble code (DTC) AEM-5F11 is stored if the control module registers that the signal is too high or if there is an open-circuit in the cable to the relay for the electrical engine block heater.

The diagnostic trouble code (DTC) can be diagnosed when the ignition is on and the relay for the electrical engine block heater is not activated.

Substitute Value 

• The relay for the electrical engine block heater is switched off.

Possible Source 

• Short-circuit to supply voltage in the signal cable for the relay for the electrical engine block heater
• Open-circuit in the signal cable for the relay for the electrical engine block heater
• Open-circuit in the ground cable for the relay for the electrical engine block heater
• Defective relay for the electrical engine block heater.

Fault symptom[s] 

• Poor heating in the passenger compartment.