Circuit Description

When the back door opener switch is turned ON, the smart key ECU uses the back door oscillator (outer) and antenna to output a request signal to the outside of the vehicle for a distance of approximately 1.0 m (3.3 ft) from the back door. A smart key near the back door detects this request and transmits its ID code. The door control receiver receives the ID code and sends this ID code to the smart key ECU. The smart key ECU checks if the ID code is valid. If the ID code is verified, the smart key ECU sends a back door open signal to the instrument panel J/B assy (multiplex network body ECU) using the multiplex communication line and stops outputting request signals. The instrument panel J/B (multiplex network body ECU) then unlocks the back door.