On-vehicle Inspection ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT HEADLIGHT RELAY 
(a) Remove the headlight relay from the engine room relay box.
(c) Install the headlight relay to the engine room relay box. |
Toyota Tundra Service Manual > Can Communication System: Open in One Side of Bus 3 Branch Line
DESCRIPTION If an ECU or sensor is not displayed on the "CAN Bus Check" screen of the Techstream and some ECUs and sensors repeatedly appear and disappear from the screen when the CAN main bus lines are normal (there is no open, short, short to +B or short to GND in the main bus lines), there may be ...
