Electronic Entry Module: Notes
The Viper Coupe and Roadster utilize an Electronic Entry Module (EEM). The module is located on the left side of the transmission tunnel, above the knee bolster. It is secured with a rubber strap. It contains a 32-way and two 6-way connectors. There is a green six way connector and a black six way connector. The module is connected to the CCD bus and transmits the "Okay to run" message to the PCM when the theft alarm function is not tripped. It also receives the vehicle speed message from the bus and through a hardwired backup circuit.
The Coupe and Roadster will use electric door latches to accomplish opening and closing of the vehicle doors and electronics to accomplish the lock function that was typically performed with linkage inside the door. The system utilizes electric latches inside the door and micro switches both inside and outside the vehicle. These switches are inputs to the EEM and if the conditions are correct, the EEM will unlatch the doors. The lock function is simply the ignoring of the switch inputs that would normally cause the EEM to open the doors. There is no mechanical lock inside the door. This results in fewer moving parts and problems associated with packaging the linkage mechanisms.
The Electronic Entry Module provides remote keyless entry functions as well as vehicle theft alarm functions, electric locking/unlocking and the opening or power unlatching of the doors. The Coupe and Roadster will power unlatch the doors based only on inputs from the switches on the inside or the outside of the vehicle. The unlock button on the fob will not power unlatch the door. It also allows for the rolling lock feature, the only difference from other rolling lock systems is that specific throttle angle is not required for the locks to actuate. It is strictly a speed based system.
The inside and outside door handles control micro switches that are the inputs to the EEM. Located with the inside door switches are the lock rocker switches with LED indicators. The LED lock indicator informs the driver and passenger of the lock status of the doors. If the light is on, the doors are unlocked. Once the vehicle is started and driven approximately 8 mph (+1-3) the doors will automatically lock and the LED will be extinguished at this time. The rolling lock feature cannot be disabled. If there is no activity for approximately one minute (input to the EEM) and the key is in the "on" or "off" position, the LED will be turned off to reduce battery draw.
The driver and passenger lock switches are wired in parallel and form one input to the EEM. When the EEM receives a lock input, both doors are locked. When an unlock signal is input to the EEM, both doors are unlocked. If the key is on, and an inside door handle input is seen and vehicle speed is below 5 mph, both doors will be unlocked (and the door's handle that was actuated will be power unlatched). The lock switches are a momentary contact rocker type switch and either switch will lock or unlock both doors. In case of an electrical failure that would render the EEM system inoperable, there is an emergency mechanical release for the door located in the B-pillar area of the door. This can be accessed through the liftglass area from outside the vehicle.