While driving down the highway and around town the door locks on our Grand Prix almost continually cycle to the lock position. The locks never unlock unless you push the button on the key fob or the door. Somedays they operate normally then the will chatter all day. The lock delay works normally when you close the doors. Any suggestions?
What causes the electric door locks on a 2001 Grand Prix chatter while driving? on 2001 Pontiac Grand Prix
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MOST LIKLY TO BE A DEFECTIVE DOOR LOCK ACTUATOR MAY BE MORE THAN ONE
Found it! After changing the Park/Neutral Position switch (the only common switch between the locks and the truck release) I checked the voltage at the trunk release relay. Only got 3.3 volts instead of 12 volts. Traced the problem to a corroded wire in the bundle which runs above the battery. Spliced in a new segment and fixed all the problems. Kudos to ALLDATAdiy.com for having the schematics and component locations I needed to fix this.