My passenger power lock failed. The actuator motor was constantly running, whining like the gears were stripped. I replaced the actuator and found the lock constantly going into an unlock position and the door could not be locked. When I tested the two connections to the actuator, the output was at a constant 12V. Changing the the position of the lock/unlock switch did not alter the signal at the actuator(there was no change in polarity and the 12 vdc was constant). The left door works fine. I now believe the problem is now, and was originally, coming from the "smart junction box". My knowledge of this box is nill. Do you believe my smart junction box is the source of the problem? Can I trouble shoot the lock/unlock relays shown in the smart junction box for a 2005 mustang.
Saturday, September 8th, 2012 AT 10:00 PM