The window release system is provided with positive battery voltage (B+) continuously through the following components:
| • | The instrument panel (IP) fuse block |
| • | The MIR/LKS Fuse 7 |
| • | The terminal C5 |
| • | CKT 840 (ORN) |
When the correct control inputs are received, the body relay block provides B+ at terminal F5 through CKT 56 (BLK/WHT) to the lift window release actuator terminal A. The lift window release actuator is provided a ground continuously from terminal B through CKT 1350 (BLK) to G450. Another ground redundant to the Endgate/liftgate window release actuator circuit is provided from S427 through CKT 1450 (BLK) to G450.
The BBEC provides B+ to the lift window release actuator in order to allow for a remote or non-remote operation.
For the remote operation, the body control module (BCM) monitors various inputs. The BCM then provides the necessary output to remotely operate one of the control-side functions of the lift window release system.
The BCM must have power and ground continuously. The BCM requires there be no voltage present at a circuit that is normally hot in the run position or in the crank only position.
In a vehicle with an automatic transmission, the BCM must receive a signal that the transmission selector is in the PARK or the NEUTRAL position. If the vehicle has a manual transmission, the BCM must receive a signal showing that the park brake is applied.
If the vehicle has remote keyless entry (RKE), and the transmitter has been activated, the BCM must receive a request from a Class 2 serial data signal. The receiver provides the signal. Refer to Remote Keyless Entry.
If all the required input conditions for correct operation exist, the BCM allows remote operation of the lift window release from either a switch inside the vehicle or from a RKE system.
If any of the required input conditions do not exist, the BCM will prevent a remote operation of the system.
Important: The system has a second, non-remote function. Because of the second function, the BCM does not prevent the system from operating outside of the vehicle when you use the endgate/liftgate lock cylinder switch.
A endgate/liftgate window release (REAR HATCH) switch is located on the instrument panel (IP). The window release (REAR HATCH) switch is part of the rear wiper/washer switch and the endgate/liftgate window release switch. The window release (REAR HATCH) switch is a manually controlled momentary contact switch. The switch is normally open.
The lift window release (REAR HATCH switch) is connected from terminal D through CKT 1576 (BLK) to the BCM connector C3 terminal B1.
The lift window release (REAR HATCH) switch is provided a ground continuously from terminal E through CKT 1050 (BLK) to G203. Another ground redundant to the lift window release (REAR HATCH) switch circuit is provided from G203 through CKT 1050 (BLK) to G204.
When the lift window release (REAR HATCH) switch is depressed, a ground is applied through the closed contacts of the switch. A ground present at the BCM connector C3 terminal B1 is interpreted by the module as a request signal from the lift window release (REAR HATCH) switch.
Upon receiving a request signal from the lift window release (REAR HATCH) switch, the BCM monitors other inputs to determine if the conditions for operation exist. The following actions occur if all of the required conditions exist:
| • | The request is granted. |
| • | The BCM connector C2 terminal A6 changes state from open to ground. |
The BCM connector C2 terminal A6 provides ground through CKT 1344 (LT/BLU) to the following components:
| • | The BBEC terminal F6 |
| • | The endgate/liftgate liftglass relay |
The following conditions exist:
| • | The normally open liftglass relay is energized. |
| • | The contacts are closed. |
| • | B+ is available at the BBEC terminal F5. The available B+ operates the window release actuator. |
The following components are involved in the non-remote controlled function:
| • | A key operated switch (endgate) |
| • | A push button switch (liftgate) |
| • | Left front door lock cylinder switch |
| • | Associated circuits |
B+ is provided at the BBEC terminal F5 through the following components during non-remote operation of the system:
| • | A separate control circuit that includes the following components: |
| - | The BBEC terminals D5 and E6 |
| - | A endgate/liftgate lock cylinder switch |
| - | A door lock cylinder switch, which is part of the left front door lock actuator |
| • | Related circuits |
The endgate/liftgate lock cylinder switch is located in the endgate/liftgate. The lock cylinder switch is key operated and manually controlled. The lock cylinder switch is a momentary contact switch that is normally open. The door lock cylinder switch is part of the left, front door lock actuator. The door lock cylinder is closed when the left front door is unlocked. The switch is open when the door is locked.
The BBEC supplies B+ continuously from terminal D5 through CKT 840 (ORN) to the endgate/liftgate lock cylinder switch terminal D. When the switch is closed, the endgate/liftgate lock cylinder switch supplies voltage from terminal C through CKT 1221 (WHT/BLK) to the door lock cylinder switch terminal A. When closed the door lock cylinder switch supplies voltage from terminal B through CKT 56 (BLK/WHT) to the BBEC terminal E6.
The BBEC terminals E6 and F5 are internally bussed. B+ is available at the BBEC terminal F5 to operate the lift window release actuator.
The operation of the lift window release with the RKE is similar. Refer to Remote Keyless Entry.
The endgate/liftgate window release actuator is protected by a built-in electronic circuit breaker (ECB). If the motor is overloaded or voltage is applied for an excessive amount of time, the ECB internal resistance increases. This condition creates an open circuit. The resistance returns to normal after the voltage is removed from the circuit. This condition restores circuit continuity.
