Unlocking

The unlocking operation is similar to the locking operation except that the polarity of the voltage applied to the door lock motors is reversed. This causes the motors to run in the opposite direction, unlocking the doors.

Setting a front door lock switch to the UNLOCK position provides an input signal to the PZM on CKT 781 (ORN/BLK) or CKT 245 (DK BLU). The switch grounds a terminal on the body control module (PZM) to ground CKT 151 (BLK/WHT) or 51 (BLK/WHT). The body control module (PZM) in turn provides two output signals which accomplish the unlocking function.

On one circuit, the PZM provides an output on CKT 194 (WHT) to the unlock coil of the door lock relay. The unlock relay contacts close, providing power from the CONVENC fuse to the RH front and RH, LH rear (on four-door models) door lock motors through the closed relay contacts and CKT 294 (TAN).

Voltage to unlock the LH front door lock motor is applied through the LH front door unlock relay. During unlocking, the body control module (PZM) provides an output on CKT 1391 (LT ORN) which grounds the coil of the LH front door unlock relay. Voltage on CKT 2G40 (ORN) energizes the relay coil. The CONVENC fuse supplies power to the front door lock motor through CKT 2G40 (ORN), the closed relay contacts and CKT 694 (TAN).

All of the door lock motors run because they are grounded through CKT 295 (GRY), the lock relay contacts of the door lock relay and CKT 1250 (BLK).