Electrical connector with terminal position assurance device

An electrical connector, comprising:

• a housing having a plurality of terminal-receiving passages extending between a forward mating end of the housing and a rear end thereof, the housing having a slot intersecting the terminal-receiving passages;
• a plurality of terminals received in the passages, the terminals each including a locking shoulder;
• primary lock means operatively associated between the housing and the terminals for locking the terminals in the passages, the primary lock means projecting into the slot in the housing;
• a terminal position assurance device movably mounted in the slot in the housing for movement between first, second and third positions, the device being movable from the first to the second position only when all of the terminals are properly positioned in their respective passages, the device including secondary latch means for engagement behind the locking shoulders of the terminals when the device is in its second position and when the terminals are properly positioned in their respective passages;
• and
• complementary interengaging means between the terminal position assurance device and the primary lock means for moving the primary lock means to an unlocking condition in response to moving the terminal position assurance device to the third position thereby allowing removal of the terminals.