The power door lock system consists of the following components:

The power door lock system can be controlled by any of the following:

Each door module controls the locking and unlocking of its respective door, but the rear integration module (RIM), which is the master control for the door lock system, determines when the lock functions are permitted. The RIM receives and examines lock function requests from the individual door modules, or from the remote function actuator (RFA) via the class 2 serial data circuit. The RIM also examines the transmission shift selector position and the ignition switch position information available over the class 2 serial data circuits. If the RIM determines that all conditions are correct for a lock or unlock function to be permitted, it sends a class 2 message back to the individual door modules commanding them to perform the requested lock or unlock function of their respective doors.

Additionally, the left rear door module uses the door lock relay to control the locking and unlocking of the endgate/liftgate door.

Each door module has a separate battery voltage circuit fed by the rear fuse block. Each door module is separately grounded through one or more circuits connected to a ground stake. These voltage and ground circuits are in the C3 harness connector of each door module and are used for power door lock operations, as well as to power up the door modules. These circuits are also used for outside rearview mirror operations and for some power window functions, which are covered in the applicable power mirror and window description and operations sections.

The DDM battery voltage circuit is fed by the DRIVER DR MOD 10 amp fuse.

The PDM battery voltage circuit is fed by the PSGR DR MOD 10 amp fuse.

The LRDM and RRDM also have separate battery voltage circuits, but they are both fed by the REAR DR MDL 15 amp fuse.

These circuits must not be confused with the voltage and ground circuits of door modules harness connector C1, which are used exclusively to drive the power window motors.

The front passenger door lock switch is wired to the front passenger door module. The lock switch is supplied battery voltage and ground by the front passenger door module. There are 2 circuits for voltage, one for a lock signal, and one for an unlock signal. The module supplies ground to the switch via a 3rd circuit. When the switch is activated for a lock or unlock function, the normally open switch contacts for that function are closed and voltage flows through the switch, providing the module with the appropriate signal input.

The driver door lock switch is similar to the front passenger door lock switch, but it is wired to the driver door switch assembly (DDSA), and, for a ground circuit, to the driver door module. It also works the same way as the front passenger door lock switch works, but the switch activations are detected and processed by the DDSA and less voltage is required for lock switch operation. The DDSA has two circuits that each supply 5 volts to the driver door lock switch, one for a lock signal, and one for an unlock signal. The driver door lock switch ground circuit is provided by the driver door module. When the door lock switch is activated, the normally open switch contacts for that function are closed, the voltage flows through the switch and is detected by the DDSA. The DDSA then relays the switch information to the driver door module via the class 2 serial data circuit.

The endgate/liftgate door and rear passenger doors are not provided with power door lock switches.

A power door lock motor is contained within each door lock actuator. Each door module supplies battery voltage and ground, through the door lock actuator motor control circuits to its associated door lock actuator motor. The left rear door module, in addition, controls the lock actuator motor of the endgate/liftgate door by simultaneously applying voltage to the door lock relay. The power door lock motors are reversible. The function performed by the lock motor, lock or unlock, depends on which motor control circuit the voltage is applied to, and which motor control circuit the ground is applied to. To perform a lock function, the module momentarily applies voltage to the door lock motor lock control circuit, and ground to the door lock motor unlock control circuit. To perform an unlock function, the door module reverses the polarity and momentarily applies voltage to the door lock motor unlock control circuit, and ground to the door lock motor lock control circuit.

Export vehicles may have the deadbolt feature, which includes a reversible deadbolt motor contained within each door lock actuator. Each deadbolt motor is wired to the associated door module through a deadbolt motor control circuit. The deadbolt motor functions much the same as the lock motor. To deadbolt a door, the door module first locks the door by momentarily applying battery voltage to the door lock motor lock control circuit, and ground to the door lock motor unlock control circuit. To complete the deadbolting, the door module then momentarily applies battery voltage to the deadbolt motor control circuit, and, again, ground to the door lock motor unlock control circuit. Once the door is deadbolted, the mechanical lock/unlock linkage within the door lock actuator is physically disconnected so that the door can not be manually unlocked. If the content theft feature is armed at the same time, it also will not be possible to use the interior door lock switches to operate the locks.

To undeadbolt the door, the door module reverses the polarity, applying battery voltage to the door lock motor unlock control circuit, and ground to the deadbolt motor control circuit.

The liftgate door is not equipped with a separate lock switch or mechanical lock lever. It can only be locked or unlocked electronically and in conjunction with the left rear door lock.

The left rear door module (LRDM) controls the liftgate lock by activating the door lock relay. The control circuits of the door lock relay are spliced into the motor control circuits of the left rear door lock actuator, between the actuator and the LRDM. To operate both locks, the LRDM momentarily applies battery voltage to the appropriate lock or unlock motor control circuit of the left rear door lock actuator. As a result, voltage is also applied to the corresponding control circuit of the door lock relay, which activates the relay. Once activated, the relay momentarily closes the appropriate control circuit of the liftgate lock actuator motor to battery voltage. The lock actuator motor pulses to lock or unlock the liftgate door.

The door lock relay is supplied battery voltage at all times through the door lock relay battery positive voltage circuit and the REAR HATCH 10 amp fuse, which is located in the rear fuse block. The relay is grounded at all times, through the ground circuit, to a ground stake.

Like the other door lock actuator motors, the liftgate lock actuator motor is reversible. The function performed, lock or unlock, depends on which motor control circuit the voltage is applied to, and which motor control circuit the ground is applied to. When no locking or unlocking activity is taking place, the motor control circuits are normally grounded by the door lock relay. To perform a lock function, the door lock relay momentarily closes the lock control circuit to battery voltage, while the unlock control circuit remains grounded. To perform an unlock function, the door lock relay momentarily closes the unlock control circuit to battery voltage, while the lock control circuit remains grounded.

The door lock relay is used only for the liftgate functions and, except for when a failure may occur to the relay control circuits, is not directly involved with other vehicle door locking and unlocking functions.

The automatic door lock system provides for the locking or unlocking of one, or all of the doors when shifting the transmission. When the vehicle doors are closed, the ignition is turned to ON, and the transmission is shifted out of Park, all the doors will lock. When the vehicle is stopped and the transmission is shifted into Park, one or all of the doors will unlock. This system is commanded according to the information stored in the rear integration module (RIM) which is the door lock master. Automatic door locking is programmed during the manufacturing process but it can be custom programmed by the operator. For information concerning custom programming available and programming instructions, refer to Driver Personalization in Personalization.

Operation of the automatic door lock system also depends upon door status information gathered by the door modules and the RIM. The system will not operate if the RIM detects that a vehicle side door or liftgate door is open. For side door status relevant to automatic door locking, each door lock actuator contains a door open switch. Each door open switch receives battery voltage and ground from the associated door module. When a door is open, the switch closes, battery voltage flows through the switch, and the door module interprets the flow of voltage as a door open input. The door module then sends this information out over the class 2 serial data circuit, where it is detected by the RIM, as well as other concerned modules. The liftgate door does not contain a door open switch. Instead, the liftgate ajar indicator switch is used to directly signal liftgate door status to the RIM. The RIM supplies battery voltage to one side of the normally open contacts of the liftgate ajar indicator switch. The other side of the contacts is grounded to a ground stake. When the liftgate door is ajar, the switch closes, battery voltage flows through the switch, and the RIM interprets the flow of voltage as a liftgate door ajar input. If the RIM determines that one of the vehicle side doors is open, or that the liftgate is ajar, automatic door locking will not be permitted.

The signals supplied by the door open switches of the side doors, and by the ajar indicator switch of the liftgate door, are also used by the lighting system in order to determine when to turn the vehicle courtesy lamps ON or OFF. For more information concerning courtesy lamps and the side door open switches, refer to Interior Lighting Systems Description and Operation in Lighting systems.

It should further be noted that, while each side door open switch shares its ground circuit with another switch in the side door lock actuator, the side door ajar indicator switch, the 2 switches must not be confused when service is required. Unlike the side door open switches and the liftgate door ajar indicator switch, the side door ajar indicator switches have no effect on door locking. For more information concerning side door ajar indicators and the side door ajar indicator switches, refer to Door Ajar Indicator Description and Operation .

Leaving the key in the ignition with any door open will disable the use of the power door locks and the remote keyless entry (RKE) lock function.

The anti-lockout feature can be overridden by holding the lock switch in the LOCK position for more than 3 seconds.

The vehicle may have the central door unlock feature. With this feature, all doors can be unlocked from the driver door using the door key. To operate the feature, the door key is inserted into the driver door lock cylinder, turned to the unlock position and held for 3 seconds or longer, or, turned to the unlock position twice within 3 seconds. A mechanical linkage rod connects the driver door lock cylinder to the key cylinder unlock switch, which is built into the driver door lock actuator. The key cylinder unlock switch contacts, which are normally open, receive battery voltage, via the key cylinder unlock signal circuit, and ground via the ground circuit, from the driver door module (DDM). When the door key is turned to unlock, the switch contacts close and the DDM detects the flow of voltage as an input. The DDM then sends a class 2 message to the rear integration module (RIM), indicating the key cylinder unlock switch request. The RIM is the master of all lock and unlock operations. If the RIM determines that the key cylinder unlock switch request is a valid request and conditions are correct for the door modules to perform the unlock function, it sends a class 2 message back to all of the door modules to unlock all doors.

Some export vehicles may have the central door lock feature. Some export vehicles may have both the central door lock and deadbolt features. With the central door lock feature, all doors can be locked from the driver door using the door key. With the central door lock and deadbolt features, all doors can be locked and deadbolted from the driver door using the door key. When the doors have been deadbolted, they cannot be unlocked using the manual lock buttons. If the content theft deterrent has been armed at the same time, it also will not be possible to unlock the doors using the interior door lock switches. All doors can be un-deadbolted using the driver door key, however, only the driver door will also be unlocked. After undeadbolting with the door key, the passenger doors can be unlocked manually, or by using either the interior lock switches or the remote transmitter.

To operate the central door lock feature, the door key is inserted into the driver door lock cylinder and turned to the lock position, which causes all doors to lock immediately. A mechanical linkage rod connects the driver door lock cylinder to the key cylinder lock switch, which is built into the driver door lock actuator. The key cylinder lock switch contacts, which are normally open, receive battery voltage, via the key cylinder lock signal circuit, and ground via the ground circuit, from the driver door module (DDM). When the door key is turned to lock, the switch contacts close and the DDM detects the flow of voltage as an input. The DDM then sends a class 2 message to the rear integration module (RIM ), indicating the key cylinder lock switch request. If the RIM determines that the key cylinder lock switch request is a valid request and conditions are correct for the door modules to perform the lock function, it sends a class 2 message back to all of the door modules to lock all doors.

To operate the deadbolt feature, the door key is turned to the lock position, which causes all doors to lock immediately. If the door key is then held to the Lock position for 3  seconds or longer, or, turned to the Lock position twice within 3 seconds, the DDM interprets the key cylinder lock switch input as a deadbolt request. The DDM then sends a class 2 message to the RIM indicating the request. If the RIM determines that the deadbolt request is a valid request and conditions are correct for the door modules to perform the deadbolt function, it sends a class 2 message to all of the door modules to deadbolt all doors. When the doors are deadbolted, all doors are locked and the mechanical lock/unlock linkage within each door lock actuator is physically disconnected so that no door can be manually unlocked. If the content theft deterrent has also been armed, it also will not be possible to unlock the doors using the interior door lock switches.

To undeadbolt the doors with the driver door key, the key cylinder unlock switch is used. The key cylinder unlock switch input is interpreted as an undeadbolt request because the vehicles content options are configured for export. The normally open key cylinder unlock switch contacts receive battery voltage, via the key cylinder unlock signal circuit, and ground via the ground circuit, from the DDM, just as they do on a vehicle with the central door unlock feature. When the driver door lock cylinder is turned to unlock, the switch contacts close and the DDM detects the flow of voltage as an input. The DDM then sends a class 2 message to the RIM, indicating the switch request. The RIM interprets this key cylinder unlock switch request as an undeadbolt request. If all conditions are correct, the RIM sends a message back to all door modules to un-deadbolt. The driver door will be both unlocked and undeadbolted, while the passenger doors will be only undeadbolted. The passenger doors can then be unlocked manually, or, by using either the interior lock switch or the remote transmitter.

By performing the following actions, the doors can also be locked and deadbolted, or unlocked and undeadbolted using the remote transmitter: