Locking/Opening Fuel Tank Filler Cover
The switch for opening the fuel tank filler cover is in the light switch module (LSM). The light switch module (LSM) is serially connected, via LIN, to the central electronic module (CEM) and transmits a signal to the central electronic module (CEM) when the switch is pressed. The lock motor is directly connected to the central electronic module (CEM).
When the central electronic module (CEM) receives a signal indicating that the switch has been pressed, the central electronic module (CEM) powers the lock motor, which starts to operate. The lock motor has a spring-loaded piston which returns to its original position after a fully completed cycle. This means that the lock motor only needs to operate in one direction. When the sun roof is closed, it is locked.
Fuel tank filler cover opening has a delay of 1 second as certain markets (USA/CDN) have automatic fuel leak detection installed.
When the switch is pressed, a signal is transmitted to the Engine control module (ECM) to stop fuel leak diagnostics. The delay is so that the fuel tank has time to eliminate the over pressure before the fuel tank filler cover is removed.