Back Door Entry Unlock Function does not Operate: Description

When the back door opener switch is turned ON, the certification 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 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 certification ECU. The certification ECU checks if the ID code is valid. If the ID code is verified, the certification ECU sends a back door open signal to the driver side junction block (main body ECU) using the multiplex communication line and stops outputting request signals. The driver side junction block (main body ECU) then unlocks the back door.