Light Auto Turn Off

WARNING: This page is about a different car, the 2003 Lexus RX 300 and 2002 Lexus RX 300. However, it is still accessible from the selected car via links, so may be relevant.

This system automatically turns off the taillights and/or headlights when the driver door is opened and closed to prevent the lights from remaining lit.

Taillights On - If the ignition switch is turned from on to off with the taillights turned on (the light control switch at TAIL position), the signal is input to terminal No. IG of the body ECU. At this time, if the driver door is opened, the signal is input from the LH front door courtesy switch to terminal No. CTY of the driver door ECU. After that, terminal No. TAIL of the body ECU is controlled through communication control of the body ECU and door ECU etc. to turn off the taillight relay. As a result, the current flowing into the taillights is cut off to turn off the taillights.
Taillights & Headlights On - If the ignition switch is turned from on to off with the taillights and headlights turned on (the light control switch at HEAD position), the signal is input to terminal No. IG of the body ECU. At this time, if the driver door is opened, the signal is input from the front LH door courtesy switch to terminal No. CTY of the driver door ECU. After that, terminals No. TAIL and HEAD of the body ECU is controlled through communication control of the body ECU and door ECU etc. to turn off the taillight relay and HEAD LAMP relay. As a result, the current flowing into the taillights and headlights is cut off to turn off the taillights and headlights.