Principles of Operation
PRINCIPLES OF OPERATIONLuggage Compartment Lid
The luggage compartment lid module receives a voltage signal from the driver door module (DDM) when either the button on the driver door trim panel, the keyless entry keypad, or the remote transmitter is pressed (twice on the transmitter). Voltage is then supplied to the luggage compartment lid latch, opening it. Using the luggage compartment lid key operates the latch mechanically, resulting in manual-only operation of the lid. There are 2 switches in the latch. One is monitored by the luggage compartment lid module to sense if the latch is closed. The other switch in the latch is monitored by both modules, luggage compartment module (LCM) and luggage compartment lid module and is used for disabling the anti-theft system, which is contained within the LCM. The luggage compartment lid module powers the lid motor to move the lid to the full-open position when it senses the latch has been opened. Optical sensors within the lid motor are monitored by the module to determine when to turn off power and which circuits should be powered or grounded to the lid motor. When 1 of the buttons is depressed with the lid open, the DDM sends a signal to the luggage compartment lid module which powers and grounds the correct circuits to the lid motor and lowers the lid until the latch closes. The module senses the latch closing through the lid latch switch that is monitored. At this time, the module powers the closing motor, slowly pulling the lid to a fully closed position. Two switches within the closing motor are monitored by the module to determine when the closing motor is fully down or up. The module has a vehicle speed output (VSO) (circuit 679) signal that is used to shut down the system if there is a VSO of approximately 5 kph (3 mph) or more. For diagnostics, the module uses the ISO-9141 circuit 70 that is included in the data link connector (DLC). Whenever battery power is lost to the luggage compartment lid module, luggage compartment lid motor, or the luggage compartment lid closing motor, the system must be initialized.