What type of locking system was installed on my 2007 HHR. Vin# 3GNDA33P87S622042

 

Should be installed by factory unless somebody added something. All HHRs came with a fob.
What is your real question?

 

Are you asking about the factory system or some add on that you have ?

 

From GM, the standard fob activated RCDLR system, press unlock button once to unlock driver’s door, twice to unlock all doors. Press lock button once to lock all doors, twice to set alarm. It’s in your owners manual, if you don’t have it, there’s a link in Donbrew’s signature