Description And Operation: Operation

SWITCH OPERATION 

• Each Passive entry (PE) outside front door handle has three switches.
• Those three switches are each powered by and provide a direct input to the integrated circuit of the respective door handle.
• The integrated circuit of each PE outside front door handle receives power from the Radio Frequency Hub Module (RFH) on a signal circuit, and a clean ground from the RFH on a return circuit.
• The integrated circuit and the RFH communicate with each other by modulating the current in the signal circuit.
• The inputs from those three switches and the handle logic circuit allow each handle to send the RFH up to four different signals: Unlock Request, Hall, Lock Request and Error.
• The RFH determines the system response based upon the inputs it receives from each handle as well as the inputs it receives through the authentication process with each detected FOB.

SWITCH FUNCTIONAL 

• The tactile, mechanical, resistive membrane lock switch allows the user to actively lock the vehicle.
• The capacitive switch senses a hand approaching the handle grip to passively unlock the vehicle.
• The Hall-effect switch senses handle grip movement.
• An adaptation algorithm in the logic circuit of each handle can modify the sensitivity of the capacitive switches as well as system responses to the Hall-effect switch inputs to compensate for sensed repeated or continuous actuations such as might be caused by the switch membrane being wetted, but restores normal sensitivity about one minute after the repeated or continuous actuation input ceases.

PASSIVE ENTRY DOOR UNLOCK OPERATION 

• The customer approaches the vehicle with a valid FOB or the customer touches either front door handle.
• The RFH will attempt to authenticate the validity and location(s) of the FOB via Passive Entry Keyless Go (PEKG antennas).
• If an authentic FOB is found in the same exterior zone (left, right) as the asserted door handle, the RFH sends out an "Unlock Door" request via CAN-C to the Body Control Module (BCM) if the following conditions are met:
  • Vehicle not moving
  • Vehicle in Park
• The BCM actuates and unlocks the door lock motor.
• Upon exiting the vehicle, the lock (tactile) switch must be pressed on the Smart handle to lock all doors.