Door Lock/Unlock

CIRCUIT OPERATION
The door lock switches use resistors internal to the switch. There are different resistors used for the LOCK and UNLOCK functions. Both switches have the same amount of resistance for the LOCK and UNLOCK functions.

When the operator selects the UNLOCK function, from either switch, voltage is passed through the CLOSED contacts in the switch, through the appropriate resistor, to the Z2 ground circuit. Circuit P96 connects from the BCM to the right door switch, and circuit P97 connects to the left door switch.

The BCM processes this request and supplies the ground path for the coil side of the unlock relay. This causes the contacts in the relay to switch from its normally grounded position to connect circuit A2 to circuits F131, F134, and F136.

Each of these circuits are protected by a different Positive Temperature Coefficient (PTC) located in the junction block, and connect to the unlock side of the motors.

Circuit F131 connects to the left front door motor, circuit F134 connects to the right front and right side door motors, circuit F136 connects to the left side door and the liftgate motor.

Ground for the motors is supplied on circuits F132 and F133. These circuits connect from the motors to the junction block. At the junction block the ground circuit is completed through the CLOSED contacts in the lock relay to the Z1 circuit. The Z1 circuit terminates at the instrument panel left side cowl.

Circuit F132 supplies the ground path for the front doors and circuit F133 supplies the ground path for the side doors and the liftgate.

For the LOCK function the circuits are reversed. Circuits F132 and F133 are the feeds to the motors, and circuits F131, F134, and F136 are the ground circuits through the CLOSED contacts in the UNLOCK relay.