SCA Assembly
Prior to this change, a micro-switch located in the upper lift-gate was used to provide the status of the lift-gate to the GM3 body electronics control module. For the 10/03 facelift, the micro-switch has been replaced with Hall Sensors for greater reliability. The hall sensors report the status of the lift-gate to the GM3. The GM3 responds to the status signals and provides the outputs to the relays that control the SCA motor. The GM3 also uses these input signals to control the upper hatch luggage compartment lights and to trigger the DWA anti-theft alarm.
The upper and lower lift-gates can be opened electrically in the same manner as before by using the respective switches in the upper and lower lift-gate. Additionally, the upper lift-gate can be opened using the center console switch, or the remote key.
The push-button switches for the upper lift-gate must be pressed for at least 200 ms in order for an electrical opening of the upper hatch to be initiated.
The SCA motor is not activated if the battery voltage is lower than 9 volts. In a crash situation (crash telegram generated), the lift-gate opening function is blocked for 10 seconds for additional safety.