I have had a problem with my 2001 S60 since I got it. The fuel door doesn't lock. I never know it was supposed to so didn't care. Now that I know it is driving me crazy.
Here are the symptoms: It will unlock. If I manually push the actuator to the lock position and press my remote unlock - it unlocks. When I lock the car using the remote or door mounted switch it will not lock.
I used a voltage meter to probe the connector and found +12 volts when I hit the unlock button. I expected -12 volts when I hit lock, but I got nothing.
Any suggestions other than replacing an expensive security module.