Fault-tracing information

Condition 

Fig 1: Identifying Childlock Switch

Courtesy of VOLVO CARS OF NORTH AMERICA.

• Diagnostic trouble codes (DTCs) missing.
• The central locking system can operated using the key or the remote control.

Possible Source 

• Open-circuit in the signal cables from the central locking switch.
• Open-circuit in the central locking switch ground lead.
• Fault in the central locking switch.