The generic electronic module (GEM) controls the power door lock and keyless entry system. Lock and unlock operation is achieved through the use of internal relays in the GEM. The relays are all door lock, all door unlock and driver door unlock. The normal path of the relays is to ground.

Pressing the door lock control switch to lock or unlock sends a ground signal to the GEM. The same GEM terminal is used for lock and unlock input. The unlock signal is a direct connection to ground. The lock signal is altered by an internal resistor in the door lock control switch. This varied resistance identifies the lock or unlock command to the GEM.

The door locks can also be controlled by the door key cylinder switches. Turning the door key cylinder switch to lock or unlock, sends a ground signal to the GEM. When the GEM receives the signal, current is supplied to the actuator and all the door lock and unlock relays are grounded.

The GEM will prevent the doors from being locked if the driver’s door is in the ajar position. If a lock command is received by the GEM and the driver’s door is ajar, the GEM will immediately actuate the all door unlock after 0.6 seconds. (If not equipped with slam-locking) If the driver’s door is ajar, the door ajar switch is open. If a lock command is carried out, the actuator switch will change states to the lock position and the circuit will be interrupted. The GEM will interpret the input from the terminals and determine the door is ajar. The GEM will then activate all door unlock.