I have a Pontiac GTP that has keyless door locks. The keyfobs are Pontiac, the system programs according to the manual, lights flash like they should, etc. When I purchased the car I thought it was a factory item. I was told by the Pontiac dealer when I tried to get the system repaired that this was an after market install. They could not explain the above ..... only that the control box under the dash was an after market one. They could not identify the manufacturer.
Any ideas on how this might be? How can the manufacturer be identified for repair?