Circuit/System Description

The liftgate object sensors are pressure sensitive touch tapes located on either side of the upper inside edge of the liftgate panel. The two tape switches are placed in series between the liftgate object sensor signal circuit and the liftgate object low reference circuit. Each object sensor has a resistor as well as a switch. The resistors enable the liftgate module to perform diagnostic functions on the circuits. When both touch tape sensors are not pressed, the 5 V reference voltage supplied by the liftgate module passes through the resistors and the liftgate module detects approximately 3.3 V. Pressing a touch tape will cause the voltage to drop to approximately to 2.5 V indicating an obstruction is present. If the liftgate is in the open position, the liftgate module will prohibit liftgate movement. If the obstruction occurs during the power close function, the liftgate module will command the liftgate to reverse direction.